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author | Adam J. Stewart <ajstewart426@gmail.com> | 2018-07-17 13:28:38 -0500 |
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committer | scheibelp <scheibel1@llnl.gov> | 2018-07-17 11:28:38 -0700 |
commit | 8ce62ba51334f0f9e4b62f795923d81514229013 (patch) | |
tree | 83a358529cf601bf51d6e99668bb5f2201de75d7 /lib | |
parent | 25062d0bd4c280ee5ec416bcb75686f50113c2a7 (diff) | |
download | spack-8ce62ba51334f0f9e4b62f795923d81514229013.tar.gz spack-8ce62ba51334f0f9e4b62f795923d81514229013.tar.bz2 spack-8ce62ba51334f0f9e4b62f795923d81514229013.tar.xz spack-8ce62ba51334f0f9e4b62f795923d81514229013.zip |
Add documentation on build systems (#5015)
Spack provides a number of classes based on commonly-used build systems
that users can extend when writing packages; the classes provide functionality
to perform the actions relevant to the build system (e.g. running "configure" for
an Autotools-based package). This adds documentation for classes supporting the
following build systems:
* Makefile
* Autotools
* CMake
* QMake
* SCons
* Waf
This includes build systems for managing extensions of the following packages:
* Perl
* Python
* R
* Octave
This also adds documentation on implementing packages that use a custom build
system (e.g. Perl/CMake).
Spack also provides extendable classes which aggregate functionality for related
sets of packages, e.g. those using CUDA. Documentation is added for
CudaPackage.
Diffstat (limited to 'lib')
-rw-r--r-- | lib/spack/docs/build_systems.rst | 83 | ||||
-rw-r--r-- | lib/spack/docs/build_systems/Autoconf-automake-process.svg | 840 | ||||
-rw-r--r-- | lib/spack/docs/build_systems/autotoolspackage.rst | 300 | ||||
-rw-r--r-- | lib/spack/docs/build_systems/cmakepackage.rst | 274 | ||||
-rw-r--r-- | lib/spack/docs/build_systems/cudapackage.rst | 38 | ||||
-rw-r--r-- | lib/spack/docs/build_systems/custompackage.rst | 204 | ||||
-rw-r--r-- | lib/spack/docs/build_systems/intelpackage.rst | 13 | ||||
-rw-r--r-- | lib/spack/docs/build_systems/makefilepackage.rst | 304 | ||||
-rw-r--r-- | lib/spack/docs/build_systems/octavepackage.rst | 47 | ||||
-rw-r--r-- | lib/spack/docs/build_systems/perlpackage.rst | 207 | ||||
-rw-r--r-- | lib/spack/docs/build_systems/pythonpackage.rst | 742 | ||||
-rw-r--r-- | lib/spack/docs/build_systems/qmakepackage.rst | 111 | ||||
-rw-r--r-- | lib/spack/docs/build_systems/rpackage.rst | 341 | ||||
-rw-r--r-- | lib/spack/docs/build_systems/rubypackage.rst | 11 | ||||
-rw-r--r-- | lib/spack/docs/build_systems/sconspackage.rst | 301 | ||||
-rw-r--r-- | lib/spack/docs/build_systems/wafpackage.rst | 124 | ||||
-rw-r--r-- | lib/spack/docs/index.rst | 1 |
17 files changed, 3941 insertions, 0 deletions
diff --git a/lib/spack/docs/build_systems.rst b/lib/spack/docs/build_systems.rst new file mode 100644 index 0000000000..562e5c9fd0 --- /dev/null +++ b/lib/spack/docs/build_systems.rst @@ -0,0 +1,83 @@ + +.. _build-systems: + +============= +Build Systems +============= + +Spack defines a number of classes which understand how to use common +`build systems <https://en.wikipedia.org/wiki/List_of_build_automation_software>`_ +(Makefiles, CMake, etc.). Spack package definitions can inherit these +classes in order to streamline their builds. + +This guide provides information specific to each particular build system. +It assumes that you've read the :ref:`packaging-guide` and expands +on these ideas for each distinct build system that Spack supports: + +.. toctree:: + :maxdepth: 1 + :caption: Make-based + + build_systems/makefilepackage + +.. toctree:: + :maxdepth: 1 + :caption: Make-incompatible + + build_systems/sconspackage + build_systems/wafpackage + +.. toctree:: + :maxdepth: 1 + :caption: Build-script generation + + build_systems/autotoolspackage + build_systems/cmakepackage + build_systems/qmakepackage + +.. toctree:: + :maxdepth: 1 + :caption: Language-specific + + build_systems/octavepackage + build_systems/perlpackage + build_systems/pythonpackage + build_systems/rpackage + build_systems/rubypackage + +.. toctree:: + :maxdepth: 1 + :caption: Other + + build_systems/cudapackage + build_systems/intelpackage + build_systems/custompackage + +For reference, the :py:mod:`Build System API docs <spack.build_systems>` +provide a list of build systems and methods/attributes that can be +overridden. If you are curious about the implementation of a particular +build system, you can view the source code by running: + +.. code-block:: console + + $ spack edit --build-system autotools + + +This will open up the ``AutotoolsPackage`` definition in your favorite +editor. In addition, if you are working with a less common build system +like QMake, SCons, or Waf, it may be useful to see examples of other +packages. You can quickly find examples by running: + +.. code-block:: console + + $ cd var/spack/repos/builtin/packages + $ grep -l QMakePackage */package.py + + +You can then view these packages with ``spack edit``. + +This guide is intended to supplement the +:py:mod:`Build System API docs <spack.build_systems>` with examples of +how to override commonly used methods. It also provides rules of thumb +and suggestions for package developers who are unfamiliar with a +particular build system. diff --git a/lib/spack/docs/build_systems/Autoconf-automake-process.svg b/lib/spack/docs/build_systems/Autoconf-automake-process.svg new file mode 100644 index 0000000000..13eb36a80e --- /dev/null +++ b/lib/spack/docs/build_systems/Autoconf-automake-process.svg @@ -0,0 +1,840 @@ +<?xml version="1.0" encoding="UTF-8" standalone="no"?> +<!-- Generated by graphviz version 2.30.1 (20130303.0813) + --> + +<!-- Title: autotools Pages: 1 --> + +<svg + xmlns:dc="http://purl.org/dc/elements/1.1/" + xmlns:cc="http://creativecommons.org/ns#" + xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" + xmlns:svg="http://www.w3.org/2000/svg" + xmlns="http://www.w3.org/2000/svg" + xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd" + xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape" + width="515pt" + height="936pt" + viewBox="0.00 0.00 515.00 936.00" + 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comes +with the package, you can generate a platform-dependent Makefile. + +^^^^^^ +Phases +^^^^^^ + +The ``AutotoolsPackage`` base class comes with the following phases: + +#. ``autoreconf`` - generate the configure script +#. ``configure`` - generate the Makefiles +#. ``build`` - build the package +#. ``install`` - install the package + +Most of the time, the ``autoreconf`` phase will do nothing, but if the +package is missing a ``configure`` script, ``autoreconf`` will generate +one for you. + +The other phases run: + +.. code-block:: console + + $ ./configure --prefix=/path/to/installation/prefix + $ make + $ make check # optional + $ make install + $ make installcheck # optional + + +Of course, you may need to add a few arguments to the ``./configure`` +line. + +^^^^^^^^^^^^^^^ +Important files +^^^^^^^^^^^^^^^ + +The most important file for an Autotools-based package is the ``configure`` +script. This script is automatically generated by Autotools and generates +the appropriate Makefile when run. + +.. warning:: + + Watch out for fake Autotools packages! + + Autotools is a very popular build system, and many people are used to the + classic steps to install a package: + + .. code-block:: console + + $ ./configure + $ make + $ make install + + + For this reason, some developers will write their own ``configure`` + scripts that have nothing to do with Autotools. These packages may + not accept the same flags as other Autotools packages, so it is + better to use the ``Package`` base class and create a + :ref:`custom build system <custompackage>`. You can tell if a package + uses Autotools by running ``./configure --help`` and comparing the output + to other known Autotools packages. You should also look for files like: + + * ``configure.ac`` + * ``configure.in`` + * ``Makefile.am`` + + Packages that don't use Autotools aren't likely to have these files. + +^^^^^^^^^^^^^^^^^^^^^^^^^ +Build system dependencies +^^^^^^^^^^^^^^^^^^^^^^^^^ + +Whether or not your package requires Autotools to install depends on +how the source code is distributed. Most of the time, when developers +distribute tarballs, they will already contain the ``configure`` script +necessary for installation. If this is the case, your package does not +require any Autotools dependencies. + +However, a basic rule of version control systems is to never commit +code that can be generated. The source code repository itself likely +does not have a ``configure`` script. Developers typically write +(or auto-generate) a ``configure.ac`` script that contains configuration +preferences and a ``Makefile.am`` script that contains build instructions. +Then, ``autoconf`` is used to convert ``configure.ac`` into ``configure``, +while ``automake`` is used to convert ``Makefile.am`` into ``Makefile.in``. +``Makefile.in`` is used by ``configure`` to generate a platform-dependent +``Makefile`` for you. The following diagram provides a high-level overview +of the process: + +.. figure:: Autoconf-automake-process.* + :target: https://commons.wikimedia.org/w/index.php?curid=15581407 + + `GNU autoconf and automake process for generating makefiles <https://commons.wikimedia.org/wiki/File:Autoconf-automake-process.svg>`_ + by `Jdthood` under `CC BY-SA 3.0 <https://creativecommons.org/licenses/by-sa/3.0/deed.en>`_ + +If a ``configure`` script is not present in your tarball, you will +need to generate one yourself. Luckily, Spack already has an ``autoreconf`` +phase to do most of the work for you. By default, the ``autoreconf`` +phase runs: + +.. code-block:: console + + $ libtoolize + $ aclocal + $ autoreconf --install --verbose --force + +All you need to do is add a few Autotools dependencies to the package. +Most stable releases will come with a ``configure`` script, but if you +check out a commit from the ``develop`` branch, you would want to add: + +.. code-block:: python + + depends_on('autoconf', type='build', when='@develop') + depends_on('automake', type='build', when='@develop') + depends_on('libtool', type='build', when='@develop') + depends_on('m4', type='build', when='@develop') + +In some cases, developers might need to distribute a patch that modifies +one of the files used to generate ``configure`` or ``Makefile.in``. +In this case, these scripts will need to be regenerated. It is +preferable to regenerate these manually using the patch, and then +create a new patch that directly modifies ``configure``. That way, +Spack can use the secondary patch and additional build system +dependencies aren't necessary. + +"""""""""""""""" +force_autoreconf +"""""""""""""""" + +If for whatever reason you really want to add the original patch +and tell Spack to regenerate ``configure``, you can do so using the +following setting: + +.. code-block:: python + + force_autoreconf = True + +This line tells Spack to wipe away the existing ``configure`` script +and generate a new one. If you only need to do this for a single +version, this can be done like so: + +.. code-block:: python + + @property + def force_autoreconf(self): + return self.version == Version('1.2.3'): + +^^^^^^^^^^^^^^^^^^^^^^^ +Finding configure flags +^^^^^^^^^^^^^^^^^^^^^^^ + +Once you have a ``configure`` script present, the next step is to +determine what option flags are available. These flags can be found +by running: + +.. code-block:: console + + $ ./configure --help + +``configure`` will display a list of valid flags separated into +some or all of the following sections: + +* Configuration +* Installation directories +* Fine tuning of the installation directories +* Program names +* X features +* System types +* **Optional Features** +* **Optional Packages** +* **Some influential environment variables** + +For the most part, you can ignore all but the last 3 sections. +The "Optional Features" sections lists flags that enable/disable +features you may be interested in. The "Optional Packages" section +often lists dependencies and the flags needed to locate them. The +"environment variables" section lists environment variables that the +build system uses to pass flags to the compiler and linker. + +^^^^^^^^^^^^^^^^^^^^^^^^^^ +Addings flags to configure +^^^^^^^^^^^^^^^^^^^^^^^^^^ + +For most of the flags you encounter, you will want a variant to +optionally enable/disable them. You can then optionally pass these +flags to the ``configure`` call by overriding the ``configure_args`` +function like so: + +.. code-block:: python + + def configure_args(self): + args = [] + + if '+mpi' in self.spec: + args.append('--enable-mpi') + else: + args.append('--disable-mpi') + + return args + +Note that we are explicitly disabling MPI support if it is not +requested. This is important, as many Autotools packages will enable +options by default if the dependencies are found, and disable them +otherwise. We want Spack installations to be as deterministic as possible. +If two users install a package with the same variants, the goal is that +both installations work the same way. See `here <https://www.linux.com/news/best-practices-autotools>`__ +and `here <https://wiki.gentoo.org/wiki/Project:Quality_Assurance/Automagic_dependencies>`__ +for a rationale as to why these so-called "automagic" dependencies +are a problem. + +By default, Autotools installs packages to ``/usr``. We don't want this, +so Spack automatically adds ``--prefix=/path/to/installation/prefix`` +to your list of ``configure_args``. You don't need to add this yourself. + +^^^^^^^^^^^^^^^^ +Helper functions +^^^^^^^^^^^^^^^^ + +You may have noticed that most of the Autotools flags are of the form +``--enable-foo``, ``--disable-bar``, ``--with-baz=<prefix>``, or +``--without-baz``. Since these flags are so common, Spack provides a +couple of helper functions to make your life easier. + +TODO: document ``with_or_without`` and ``enable_or_disable``. + +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +Configure script in a sub-directory +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +Occasionally, developers will hide their source code and ``configure`` +script in a subdirectory like ``src``. If this happens, Spack won't +be able to automatically detect the build system properly when running +``spack create``. You will have to manually change the package base +class and tell Spack where the ``configure`` script resides. You can +do this like so: + +.. code-block:: python + + configure_directory = 'src' + +^^^^^^^^^^^^^^^^^^^^^^ +Building out of source +^^^^^^^^^^^^^^^^^^^^^^ + +Some packages like ``gcc`` recommend building their software in a +different directory than the source code to prevent build pollution. +This can be done using the ``build_directory`` variable: + +.. code-block:: python + + build_directory = 'spack-build' + +By default, Spack will build the package in the same directory that +contains the ``configure`` script + +^^^^^^^^^^^^^^^^^^^^^^^^^ +Build and install targets +^^^^^^^^^^^^^^^^^^^^^^^^^ + +For most Autotools packages, the usual: + +.. code-block:: console + + $ configure + $ make + $ make install + +is sufficient to install the package. However, if you need to run +make with any other targets, for example, to build an optional +library or build the documentation, you can add these like so: + +.. code-block:: python + + build_targets = ['all', 'docs'] + install_targets = ['install', 'docs'] + +^^^^^^^ +Testing +^^^^^^^ + +Autotools-based packages typically provide unit testing via the +``check`` and ``installcheck`` targets. If you build your software +with ``spack install --test=root``, Spack will check for the presence +of a ``check`` or ``test`` target in the Makefile and run +``make check`` for you. After installation, it will check for an +``installcheck`` target and run ``make installcheck`` if it finds one. + +^^^^^^^^^^^^^^^^^^^^^^ +External documentation +^^^^^^^^^^^^^^^^^^^^^^ + +For more information on the Autotools build system, see: +https://www.gnu.org/software/automake/manual/html_node/Autotools-Introduction.html diff --git a/lib/spack/docs/build_systems/cmakepackage.rst b/lib/spack/docs/build_systems/cmakepackage.rst new file mode 100644 index 0000000000..763d368ca4 --- /dev/null +++ b/lib/spack/docs/build_systems/cmakepackage.rst @@ -0,0 +1,274 @@ +.. _cmakepackage: + +------------ +CMakePackage +------------ + +Like Autotools, CMake is a widely-used build-script generator. Designed +by Kitware, CMake is the most popular build system for new C, C++, and +Fortran projects, and many older projects are switching to it as well. + +Unlike Autotools, CMake can generate build scripts for builders other +than Make: Ninja, Visual Studio, etc. It is therefore cross-platform, +whereas Autotools is Unix-only. + +^^^^^^ +Phases +^^^^^^ + +The ``CMakePackage`` base class comes with the following phases: + +#. ``cmake`` - generate the Makefile +#. ``build`` - build the package +#. ``install`` - install the package + +By default, these phases run: + +.. code-block:: console + + $ mkdir spack-build + $ cd spack-build + $ cmake .. -DCMAKE_INSTALL_PREFIX=/path/to/installation/prefix + $ make + $ make test # optional + $ make install + + +A few more flags are passed to ``cmake`` by default, including flags +for setting the build type and flags for locating dependencies. Of +course, you may need to add a few arguments yourself. + +^^^^^^^^^^^^^^^ +Important files +^^^^^^^^^^^^^^^ + +A CMake-based package can be identified by the presence of a +``CMakeLists.txt`` file. This file defines the build flags that can be +passed to the cmake invocation, as well as linking instructions. If +you are familiar with CMake, it can prove very useful for determining +dependencies and dependency version requirements. + +One thing to look for is the ``cmake_minimum_required`` function: + +.. code-block:: cmake + + cmake_minimum_required(VERSION 2.8.12) + + +This means that CMake 2.8.12 is the earliest release that will work. +You should specify this in a ``depends_on`` statement. + +CMake-based packages may also contain ``CMakeLists.txt`` in subdirectories. +This modularization helps to manage complex builds in a hierarchical +fashion. Sometimes these nested ``CMakeLists.txt`` require additional +dependencies not mentioned in the top-level file. + +There's also usually a ``cmake`` or ``CMake`` directory containing +additional macros, find scripts, etc. These may prove useful in +determining dependency version requirements. + +^^^^^^^^^^^^^^^^^^^^^^^^^ +Build system dependencies +^^^^^^^^^^^^^^^^^^^^^^^^^ + +Every package that uses the CMake build system requires a ``cmake`` +dependency. Since this is always the case, the ``CMakePackage`` base +class already contains: + +.. code-block:: python + + depends_on('cmake', type='build') + + +If you need to specify a particular version requirement, you can +override this in your package: + +.. code-block:: python + + depends_on('cmake@2.8.12:', type='build') + + +^^^^^^^^^^^^^^^^^^^ +Finding cmake flags +^^^^^^^^^^^^^^^^^^^ + +To get a list of valid flags that can be passed to ``cmake``, run the +following command in the directory that contains ``CMakeLists.txt``: + +.. code-block:: console + + $ cmake . -LAH + + +CMake will start by checking for compilers and dependencies. Eventually +it will begin to list build options. You'll notice that most of the +build options at the top are prefixed with ``CMAKE_``. You can safely +ignore most of these options as Spack already sets them for you. This +includes flags needed to locate dependencies, RPATH libraries, set the +installation directory, and set the build type. + +The rest of the flags are the ones you should consider adding to your +package. They often include flags to enable/disable support for certain +features and locate specific dependencies. One thing you'll notice that +makes CMake different from Autotools is that CMake has an understanding +of build flag hierarchy. That is, certain flags will not display unless +their parent flag has been selected. For example, flags to specify the +``lib`` and ``include`` directories for a package might not appear +unless CMake found the dependency it was looking for. You may need to +manually specify certain flags to explore the full depth of supported +build flags, or check the ``CMakeLists.txt`` yourself. + +^^^^^^^^^^^^^^^^^^^^^ +Adding flags to cmake +^^^^^^^^^^^^^^^^^^^^^ + +To add additional flags to the ``cmake`` call, simply override the +``cmake_args`` function: + +.. code-block:: python + + def cmake_args(self): + args = [] + + if '+hdf5' in self.spec: + args.append('-DDETECT_HDF5=ON') + else: + args.append('-DDETECT_HDF5=OFF') + + return args + + +^^^^^^^^^^ +Generators +^^^^^^^^^^ + +CMake and Autotools are build-script generation tools; they "generate" +the Makefiles that are used to build a software package. CMake actually +supports multiple generators, not just Makefiles. Another common +generator is Ninja. To switch to the Ninja generator, simply add: + +.. code-block:: python + + generator = 'Ninja' + + +``CMakePackage`` defaults to "Unix Makefiles". If you switch to the +Ninja generator, make sure to add: + +.. code-block:: python + + depends_on('ninja', type='build') + +to the package as well. Aside from that, you shouldn't need to do +anything else. Spack will automatically detect that you are using +Ninja and run: + +.. code-block:: console + + $ cmake .. -G Ninja + $ ninja + $ ninja install + +Spack currently only supports "Unix Makefiles" and "Ninja" as valid +generators, but it should be simple to add support for alternative +generators. For more information on CMake generators, see: +https://cmake.org/cmake/help/latest/manual/cmake-generators.7.html + +^^^^^^^^^^^^^^^^ +CMAKE_BUILD_TYPE +^^^^^^^^^^^^^^^^ + +Every CMake-based package accepts a ``-DCMAKE_BUILD_TYPE`` flag to +dictate which level of optimization to use. In order to ensure +uniformity across packages, the ``CMakePackage`` base class adds +a variant to control this: + +.. code-block:: python + + variant('build_type', default='RelWithDebInfo', + description='CMake build type', + values=('Debug', 'Release', 'RelWithDebInfo', 'MinSizeRel')) + +However, not every CMake package accepts all four of these options. +Grep the ``CMakeLists.txt`` file to see if the default values are +missing or replaced. For example, the +`dealii <https://github.com/spack/spack/blob/develop/var/spack/repos/builtin/packages/dealii/package.py>`_ +package overrides the default variant with: + +.. code-block:: python + + variant('build_type', default='DebugRelease', + description='The build type to build', + values=('Debug', 'Release', 'DebugRelease')) + +For more information on ``CMAKE_BUILD_TYPE``, see: +https://cmake.org/cmake/help/latest/variable/CMAKE_BUILD_TYPE.html + +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +CMakeLists.txt in a sub-directory +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +Occasionally, developers will hide their source code and ``CMakeLists.txt`` +in a subdirectory like ``src``. If this happens, Spack won't +be able to automatically detect the build system properly when running +``spack create``. You will have to manually change the package base +class and tell Spack where ``CMakeLists.txt`` resides. You can do this +like so: + +.. code-block:: python + + root_cmakelists_dir = 'src' + + +Note that this path is relative to the root of the extracted tarball, +not to the ``build_directory``. It defaults to the current directory. + +^^^^^^^^^^^^^^^^^^^^^^ +Building out of source +^^^^^^^^^^^^^^^^^^^^^^ + +By default, Spack builds every ``CMakePackage`` in a ``spack-build`` +sub-directory. If, for whatever reason, you would like to build in a +different sub-directory, simply override ``build_directory`` like so: + +.. code-block:: python + + build_directory = 'my-build' + +^^^^^^^^^^^^^^^^^^^^^^^^^ +Build and install targets +^^^^^^^^^^^^^^^^^^^^^^^^^ + +For most CMake packages, the usual: + +.. code-block:: console + + $ cmake + $ make + $ make install + +is sufficient to install the package. However, if you need to run +make with any other targets, for example, to build an optional +library or build the documentation, you can add these like so: + +.. code-block:: python + + build_targets = ['all', 'docs'] + install_targets = ['install', 'docs'] + +^^^^^^^ +Testing +^^^^^^^ + +CMake-based packages typically provide unit testing via the +``test`` target. If you build your software with ``--test=root``, +Spack will check for the presence of a ``test`` target in the +Makefile and run ``make test`` for you. If you want to run a +different test instead, simply override the ``check`` method. + +^^^^^^^^^^^^^^^^^^^^^^ +External documentation +^^^^^^^^^^^^^^^^^^^^^^ + +For more information on the CMake build system, see: +https://cmake.org/cmake/help/latest/ diff --git a/lib/spack/docs/build_systems/cudapackage.rst b/lib/spack/docs/build_systems/cudapackage.rst new file mode 100644 index 0000000000..42ed61e33f --- /dev/null +++ b/lib/spack/docs/build_systems/cudapackage.rst @@ -0,0 +1,38 @@ +.. _cudapackage: + +----------- +CudaPackage +----------- + +Different from other packages, ``CudaPackage`` does not represent a build +system. Instead its goal is to simplify and unify usage of ``CUDA`` in other +packages. + +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +Provided variants and dependencies +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +``CudaPackage`` provides ``cuda`` variant (default to ``off``) to enable/disable +``CUDA``, and ``cuda_arch`` variant to optionally specify the architecture. +It also declares dependencies on the ``CUDA`` package ``depends_on('cuda@...')`` +based on the architecture as well as specifies conflicts for certain compiler versions. + +^^^^^ +Usage +^^^^^ + +In order to use it, just add another base class to your package, for example: + +.. code-block:: python + + class MyPackage(CMakePackage, CudaPackage): + ... + def cmake_args(self): + spec = self.spec + if '+cuda' in spec: + options.append('-DWITH_CUDA=ON') + cuda_arch = spec.variants['cuda_arch'].value + if cuda_arch is not None: + options.append('-DCUDA_FLAGS=-arch=sm_{0}'.format(cuda_arch[0])) + else: + options.append('-DWITH_CUDA=OFF') diff --git a/lib/spack/docs/build_systems/custompackage.rst b/lib/spack/docs/build_systems/custompackage.rst new file mode 100644 index 0000000000..092310058e --- /dev/null +++ b/lib/spack/docs/build_systems/custompackage.rst @@ -0,0 +1,204 @@ +.. _custompackage: + +-------------------- +Custom Build Systems +-------------------- + +While the build systems listed above should meet your needs for the +vast majority of packages, some packages provide custom build scripts. +This guide is intended for the following use cases: + +* Packaging software with its own custom build system +* Adding support for new build systems + +If you want to add support for a new build system, a good place to +start is to look at the definitions of other build systems. This guide +focuses mostly on how Spack's build systems work. + +In this guide, we will be using the +`perl <https://github.com/spack/spack/blob/develop/var/spack/repos/builtin/packages/perl/package.py>`_ and +`cmake <https://github.com/spack/spack/blob/develop/var/spack/repos/builtin/packages/cmake/package.py>`_ +packages as examples. ``perl``'s build system is a hand-written +``Configure`` shell script, while ``cmake`` bootstraps itself during +installation. Both of these packages require custom build systems. + +^^^^^^^^^^ +Base class +^^^^^^^^^^ + +If your package does not belong to any of the aforementioned build +systems that Spack already supports, you should inherit from the +``Package`` base class. ``Package`` is a simple base class with a +single phase: ``install``. If your package is simple, you may be able +to simply write an ``install`` method that gets the job done. However, +if your package is more complex and installation involves multiple +steps, you should add separate phases as mentioned in the next section. + +If you are creating a new build system base class, you should inherit +from ``PackageBase``. This is the superclass for all build systems in +Spack. + +^^^^^^ +Phases +^^^^^^ + +The most important concept in Spack's build system support is the idea +of phases. Each build system defines a set of phases that are necessary +to install the package. They usually follow some sort of "configure", +"build", "install" guideline, but any of those phases may be missing +or combined with another phase. + +If you look at the ``perl`` package, you'll see: + +.. code-block:: python + + phases = ['configure', 'build', 'install'] + +Similarly, ``cmake`` defines: + +.. code-block:: python + + phases = ['bootstrap', 'build', 'install'] + +If we look at the ``cmake`` example, this tells Spack's ``PackageBase`` +class to run the ``bootstrap``, ``build``, and ``install`` functions +in that order. It is now up to you to define these methods. + +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +Phase and phase_args functions +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +If we look at ``perl``, we see that it defines a ``configure`` method: + +.. code-block:: python + + def configure(self, spec, prefix): + configure = Executable('./Configure') + configure(*self.configure_args()) + +There is also a corresponding ``configure_args`` function that handles +all of the arguments to pass to ``Configure``, just like in +``AutotoolsPackage``. Comparatively, the ``build`` and ``install`` +phases are pretty simple: + +.. code-block:: python + + def build(self, spec, prefix): + make() + + def install(self, spec, prefix): + make('install') + +The ``cmake`` package looks very similar, but with a ``bootstrap`` +function instead of ``configure``: + +.. code-block:: python + + def bootstrap(self, spec, prefix): + bootstrap = Executable('./bootstrap') + bootstrap(*self.bootstrap_args()) + + def build(self, spec, prefix): + make() + + def install(self, spec, prefix): + make('install') + +Again, there is a ``boostrap_args`` function that determines the +correct bootstrap flags to use. + +^^^^^^^^^^^^^^^^^^^^ +run_before/run_after +^^^^^^^^^^^^^^^^^^^^ + +Occasionally, you may want to run extra steps either before or after +a given phase. This applies not just to custom build systems, but to +existing build systems as well. You may need to patch a file that is +generated by configure, or install extra files in addition to what +``make install`` copies to the installation prefix. This is where +``@run_before`` and ``@run_after`` come in. + +These Python decorators allow you to write functions that are called +before or after a particular phase. For example, in ``perl``, we see: + +.. code-block:: python + + @run_after('install') + def install_cpanm(self): + spec = self.spec + + if '+cpanm' in spec: + with working_dir(join_path('cpanm', 'cpanm')): + perl = spec['perl'].command + perl('Makefile.PL') + make() + make('install') + +This extra step automatically installs ``cpanm`` in addition to the +base Perl installation. + +^^^^^^^^^^^^^^^^^^^^^ +on_package_attributes +^^^^^^^^^^^^^^^^^^^^^ + +The ``run_before``/``run_after`` logic discussed above becomes +particularly powerful when combined with the ``@on_package_attributes`` +decorator. This decorator allows you to conditionally run certain +functions depending on the attributes of that package. The most +common example is conditional testing. Many unit tests are prone to +failure, even when there is nothing wrong with the installation. +Unfortunately, non-portable unit tests and tests that are +"supposed to fail" are more common than we would like. Instead of +always running unit tests on installation, Spack lets users +conditionally run tests with the ``--test=root`` flag. + +If we wanted to define a function that would conditionally run +if and only if this flag is set, we would use the following line: + +.. code-block:: python + + @on_package_attributes(run_tests=True) + +^^^^^^^ +Testing +^^^^^^^ + +Let's put everything together and add unit tests to our package. +In the ``perl`` package, we can see: + +.. code-block:: python + + @run_after('build') + @on_package_attributes(run_tests=True) + def test(self): + make('test') + +As you can guess, this runs ``make test`` *after* building the package, +if and only if testing is requested. Again, this is not specific to +custom build systems, it can be added to existing build systems as well. + +Ideally, every package in Spack will have some sort of test to ensure +that it was built correctly. It is up to the package authors to make +sure this happens. If you are adding a package for some software and +the developers list commands to test the installation, please add these +tests to your ``package.py``. + +.. warning:: + + The order of decorators matters. The following ordering: + + .. code-block:: python + + @run_after('install') + @on_package_attributes(run_tests=True) + + works as expected. However, if you reverse the ordering: + + .. code-block:: python + + @on_package_attributes(run_tests=True) + @run_after('install') + + the tests will always be run regardless of whether or not + ``--test=root`` is requested. See https://github.com/spack/spack/issues/3833 + for more information diff --git a/lib/spack/docs/build_systems/intelpackage.rst b/lib/spack/docs/build_systems/intelpackage.rst new file mode 100644 index 0000000000..a21a0beb32 --- /dev/null +++ b/lib/spack/docs/build_systems/intelpackage.rst @@ -0,0 +1,13 @@ +.. _intelpackage: + +------------ +IntelPackage +------------ + +Intel provides many licensed software packages, which all share the +same basic steps for configuring and installing, as well as license +management. + +This build system is a work-in-progress. See +https://github.com/spack/spack/pull/4300 and +https://github.com/spack/spack/pull/7469 for more information. diff --git a/lib/spack/docs/build_systems/makefilepackage.rst b/lib/spack/docs/build_systems/makefilepackage.rst new file mode 100644 index 0000000000..8a0cd04dcd --- /dev/null +++ b/lib/spack/docs/build_systems/makefilepackage.rst @@ -0,0 +1,304 @@ +.. _makefilepackage: + +--------------- +MakefilePackage +--------------- + +The most primitive build system a package can use is a plain Makefile. +Makefiles are simple to write for small projects, but they usually +require you to edit the Makefile to set platform and compiler-specific +variables. + +^^^^^^ +Phases +^^^^^^ + +The ``MakefilePackage`` base class comes with 3 phases: + +#. ``edit`` - edit the Makefile +#. ``build`` - build the project +#. ``install`` - install the project + +By default, ``edit`` does nothing, but you can override it to replace +hard-coded Makefile variables. The ``build`` and ``install`` phases +run: + +.. code-block:: console + + $ make + $ make install + + +^^^^^^^^^^^^^^^ +Important files +^^^^^^^^^^^^^^^ + +The main file that matters for a ``MakefilePackage`` is the Makefile. +This file will be named one of the following ways: + +* GNUmakefile (only works with GNU Make) +* Makefile (most common) +* makefile + +Some Makefiles also *include* other configuration files. Check for an +``include`` directive in the Makefile. + +^^^^^^^^^^^^^^^^^^^^^^^^^ +Build system dependencies +^^^^^^^^^^^^^^^^^^^^^^^^^ + +Spack assumes that the operating system will have a valid ``make`` utility +installed already, so you don't need to add a dependency on ``make``. +However, if the package uses a ``GNUmakefile`` or the developers recommend +using GNU Make, you should add a dependency on ``gmake``: + +.. code-block:: python + + depends_on('gmake', type='build') + + +^^^^^^^^^^^^^^^^^^^^^^^^^^ +Types of Makefile packages +^^^^^^^^^^^^^^^^^^^^^^^^^^ + +Most of the work involved in packaging software that uses Makefiles +involves overriding or replacing hard-coded variables. Many packages +make the mistake of hard-coding compilers, usually for GCC or Intel. +This is fine if you happen to be using that particular compiler, but +Spack is designed to work with *any* compiler, and you need to ensure +that this is the case. + +Depending on how the Makefile is designed, there are 4 common strategies +that can be used to set or override the appropriate variables: + +""""""""""""""""""""" +Environment variables +""""""""""""""""""""" + +Make has multiple types of +`assignment operators <https://www.gnu.org/software/make/manual/make.html#Setting>`_. +Some Makefiles use ``=`` to assign variables. The only way to override +these variables is to edit the Makefile or override them on the +command-line. However, Makefiles that use ``?=`` for assignment honor +environment variables. Since Spack already sets ``CC``, ``CXX``, ``F77``, +and ``FC``, you won't need to worry about setting these variables. If +there are any other variables you need to set, you can do this in the +``edit`` method: + +.. code-block:: python + + def edit(self, spec, prefix): + env['PREFIX'] = prefix + env['BLASLIB'] = spec['blas'].libs.ld_flags + + +`cbench <https://github.com/spack/spack/blob/develop/var/spack/repos/builtin/packages/cbench/package.py>`_ +is a good example of a simple package that does this, while +`esmf <https://github.com/spack/spack/blob/develop/var/spack/repos/builtin/packages/esmf/package.py>`_ +is a good example of a more complex package. + +"""""""""""""""""""""" +Command-line arguments +"""""""""""""""""""""" + +If the Makefile ignores environment variables, the next thing to try +is command-line arguments. You can do this by overriding the +``build_targets`` attribute. If you don't need access to the spec, +you can do this like so: + +.. code-block:: python + + build_targets = ['CC=cc'] + + +If you do need access to the spec, you can create a property like so: + +.. code-block:: python + + @property + def build_targets(self): + spec = self.spec + + return [ + 'CC=cc', + 'BLASLIB={0}'.format(spec['blas'].libs.ld_flags), + ] + + +`cloverleaf <https://github.com/spack/spack/blob/develop/var/spack/repos/builtin/packages/cloverleaf/package.py>`_ +is a good example of a package that uses this strategy. + +""""""""""""" +Edit Makefile +""""""""""""" + +Some Makefiles are just plain stubborn and will ignore command-line +variables. The only way to ensure that these packages build correctly +is to directly edit the Makefile. Spack provides a ``FileFilter`` class +and a ``filter_file`` method to help with this. For example: + +.. code-block:: python + + def edit(self, spec, prefix): + makefile = FileFilter('Makefile') + + makefile.filter('CC = gcc', 'CC = cc') + makefile.filter('CXX = g++', 'CC = c++') + + +`stream <https://github.com/spack/spack/blob/develop/var/spack/repos/builtin/packages/stream/package.py>`_ +is a good example of a package that involves editing a Makefile to set +the appropriate variables. + +""""""""""" +Config file +""""""""""" + +More complex packages often involve Makefiles that *include* a +configuration file. These configuration files are primarily composed +of variables relating to the compiler, platform, and the location of +dependencies or names of libraries. Since these config files are +dependent on the compiler and platform, you will often see entire +directories of examples for common compilers and architectures. Use +these examples to help determine what possible values to use. + +If the config file is long and only contains one or two variables +that need to be modified, you can use the technique above to edit +the config file. However, if you end up needing to modify most of +the variables, it may be easier to write a new file from scratch. + +If each variable is independent of each other, a dictionary works +well for storing variables: + +.. code-block:: python + + def edit(self, spec, prefix): + config = { + 'CC': 'cc', + 'MAKE': 'make', + } + + if '+blas' in spec: + config['BLAS_LIBS'] = spec['blas'].libs.joined() + + with open('make.inc', 'w') as inc: + for key in config: + inc.write('{0} = {1}\n'.format(key, config[key])) + + +`elk <https://github.com/spack/spack/blob/develop/var/spack/repos/builtin/packages/elk/package.py>`_ +is a good example of a package that uses a dictionary to store +configuration variables. + +If the order of variables is important, it may be easier to store +them in a list: + +.. code-block:: python + + def edit(self, spec, prefix): + config = [ + 'INSTALL_DIR = {0}'.format(prefix), + 'INCLUDE_DIR = $(INSTALL_DIR)/include', + 'LIBRARY_DIR = $(INSTALL_DIR)/lib', + ] + + with open('make.inc', 'w') as inc: + for var in config: + inc.write('{0}\n'.format(var)) + + +`hpl <https://github.com/spack/spack/blob/develop/var/spack/repos/builtin/packages/hpl/package.py>`_ +is a good example of a package that uses a list to store +configuration variables. + +^^^^^^^^^^^^^^^^^^^^^^^^^^ +Variables to watch out for +^^^^^^^^^^^^^^^^^^^^^^^^^^ + +The following is a list of common variables to watch out for. The first +two sections are +`implicit variables <https://www.gnu.org/software/make/manual/html_node/Implicit-Variables.html>`_ +defined by Make and will always use the same name, while the rest are +user-defined variables and may vary from package to package. + +* **Compilers** + + This includes variables such as ``CC``, ``CXX``, ``F77``, ``F90``, + and ``FC``, as well as variables related to MPI compiler wrappers, + like ``MPICC`` and friends. + +* **Compiler flags** + + This includes variables for specific compilers, like ``CFLAGS``, + ``CXXFLAGS``, ``F77FLAGS``, ``F90FLAGS``, ``FCFLAGS``, and ``CPPFLAGS``. + These variables are often hard-coded to contain flags specific to a + certain compiler. If these flags don't work for every compiler, + you may want to consider filtering them. + +* **Variables that enable or disable features** + + This includes variables like ``MPI``, ``OPENMP``, ``PIC``, and + ``DEBUG``. These flags often require you to create a variant + so that you can either build with or without MPI support, for + example. These flags are often compiler-dependent. You should + replace them with the appropriate compiler flags, such as + ``self.compiler.openmp_flag`` or ``self.compiler.pic_flag``. + +* **Platform flags** + + These flags control the type of architecture that the executable + is compiler for. Watch out for variables like ``PLAT`` or ``ARCH``. + +* **Dependencies** + + Look out for variables that sound like they could be used to + locate dependencies, such as ``JAVA_HOME``, ``JPEG_ROOT``, or + ``ZLIBDIR``. Also watch out for variables that control linking, + such as ``LIBS``, ``LDFLAGS``, and ``INCLUDES``. These variables + need to be set to the installation prefix of a dependency, or + to the correct linker flags to link to that dependency. + +* **Installation prefix** + + If your Makefile has an ``install`` target, it needs some way of + knowing where to install. By default, many packages install to + ``/usr`` or ``/usr/local``. Since many Spack users won't have + sudo privileges, it is imperative that each package is installed + to the proper prefix. Look for variables like ``PREFIX`` or + ``INSTALL``. + +^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +Makefiles in a sub-directory +^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +Not every package places their Makefile in the root of the package +tarball. If the Makefile is in a sub-directory like ``src``, you +can tell Spack where to locate it like so: + +.. code-block:: python + + build_directory = 'src' + + +^^^^^^^^^^^^^^^^^^^ +Manual installation +^^^^^^^^^^^^^^^^^^^ + +Not every Makefile includes an ``install`` target. If this is the +case, you can override the default ``install`` method to manually +install the package: + +.. code-block:: python + + def install(self, spec, prefix): + mkdir(prefix.bin) + install('foo', prefix.bin) + install_tree('lib', prefix.lib) + + +^^^^^^^^^^^^^^^^^^^^^^ +External documentation +^^^^^^^^^^^^^^^^^^^^^^ + +For more information on reading and writing Makefiles, see: +https://www.gnu.org/software/make/manual/make.html diff --git a/lib/spack/docs/build_systems/octavepackage.rst b/lib/spack/docs/build_systems/octavepackage.rst new file mode 100644 index 0000000000..4262f621ab --- /dev/null +++ b/lib/spack/docs/build_systems/octavepackage.rst @@ -0,0 +1,47 @@ +.. _octavepackage: + +------------- +OctavePackage +------------- + +Octave has its own build system for installing packages. + +^^^^^^ +Phases +^^^^^^ + +The ``OctavePackage`` base class has a single phase: + +#. ``install`` - install the package + +By default, this phase runs the following command: + +.. code-block:: console + + $ octave '--eval' 'pkg prefix <prefix>; pkg install <archive_file>' + + +Beware that uninstallation is not implemented at the moment. After uninstalling +a package via Spack, you also need to manually uninstall it from Octave via +``pkg uninstall <package_name>``. + +^^^^^^^^^^^^^^^^^^^^^^^ +Finding Octave packages +^^^^^^^^^^^^^^^^^^^^^^^ + +Most Octave packages are listed at https://octave.sourceforge.io/packages.php. + +^^^^^^^^^^^^ +Dependencies +^^^^^^^^^^^^ + +Usually, the homepage of a package will list dependencies, i.e. +``Dependencies: Octave >= 3.6.0 struct >= 1.0.12``. The same information should +be available in the ``DESCRIPTION`` file in the root of each archive. + +^^^^^^^^^^^^^^^^^^^^^^ +External Documentation +^^^^^^^^^^^^^^^^^^^^^^ + +For more information on the Octave build system, see: +https://octave.org/doc/v4.4.0/Installing-and-Removing-Packages.html diff --git a/lib/spack/docs/build_systems/perlpackage.rst b/lib/spack/docs/build_systems/perlpackage.rst new file mode 100644 index 0000000000..c2a8543251 --- /dev/null +++ b/lib/spack/docs/build_systems/perlpackage.rst @@ -0,0 +1,207 @@ +.. _perlpackage: + +----------- +PerlPackage +----------- + +Much like Octave, Perl has its own language-specific +build system. + +^^^^^^ +Phases +^^^^^^ + +The ``PerlPackage`` base class comes with 3 phases that can be overridden: + +#. ``configure`` - configure the package +#. ``build`` - build the package +#. ``install`` - install the package + +Perl packages have 2 common modules used for module installation: + +""""""""""""""""""""""" +``ExtUtils::MakeMaker`` +""""""""""""""""""""""" + +The ``ExtUtils::MakeMaker`` module is just what it sounds like, a module +designed to generate Makefiles. It can be identified by the presence of +a ``Makefile.PL`` file, and has the following installation steps: + +.. code-block:: console + + $ perl Makefile.PL INSTALL_BASE=/path/to/installation/prefix + $ make + $ make test # optional + $ make install + + +""""""""""""""""" +``Module::Build`` +""""""""""""""""" + +The ``Module::Build`` module is a pure-Perl build system, and can be +identified by the presence of a ``Build.PL`` file. It has the following +installation steps: + +.. code-block:: console + + $ perl Build.PL --install_base /path/to/installation/prefix + $ ./Build + $ ./Build test # optional + $ ./Build install + + +If both ``Makefile.PL`` and ``Build.PL`` files exist in the package, +Spack will use ``Makefile.PL`` by default. If your package uses a +different module, ``PerlPackage`` will need to be extended to support +it. + +``PerlPackage`` automatically detects which build steps to use, so there +shouldn't be much work on the package developer's side to get things +working. + +^^^^^^^^^^^^^^^^^^^^^ +Finding Perl packages +^^^^^^^^^^^^^^^^^^^^^ + +Most Perl modules are hosted on CPAN - The Comprehensive Perl Archive +Network. If you need to find a package for ``XML::Parser``, for example, +you should search for "CPAN XML::Parser". + +Some CPAN pages are versioned. Check for a link to the +"Latest Release" to make sure you have the latest version. + +^^^^^^^^^^^^ +Package name +^^^^^^^^^^^^ + +When you use ``spack create`` to create a new Perl package, Spack will +automatically prepend ``perl-`` to the front of the package name. This +helps to keep Perl modules separate from other packages. The same +naming scheme is used for other language extensions, like Python and R. + +^^^^^^^^^^^ +Description +^^^^^^^^^^^ + +Most CPAN pages have a short description under "NAME" and a longer +description under "DESCRIPTION". Use whichever you think is more +useful while still being succinct. + +^^^^^^^^ +Homepage +^^^^^^^^ + +In the top-right corner of the CPAN page, you'll find a "permalink" +for the package. This should be used instead of the current URL, as +it doesn't contain the version number and will always link to the +latest release. + +^^^ +URL +^^^ + +If you haven't found it already, the download URL is on the right +side of the page below the permalink. Search for "Download". + +^^^^^^^^^^^^^^^^^^^^^^^^^ +Build system dependencies +^^^^^^^^^^^^^^^^^^^^^^^^^ + +Every ``PerlPackage`` obviously depends on Perl at build and run-time, +so ``PerlPackage`` contains: + +.. code-block:: python + + extends('perl') + + depends_on('perl', type=('build', 'run')) + + +If your package requires a specific version of Perl, you should +specify this. + +Although newer versions of Perl include ``ExtUtils::MakeMaker`` and +``Module::Build`` as "core" modules, you may want to add dependencies +on ``perl-extutils-makemaker`` and ``perl-module-build`` anyway. Many +people add Perl as an external package, and we want the build to work +properly. If your package uses ``Makefile.PL`` to build, add: + +.. code-block:: python + + depends_on('perl-extutils-makemaker', type='build') + + +If your package uses ``Build.PL`` to build, add: + +.. code-block:: python + + depends_on('perl-module-build', type='build') + + +^^^^^^^^^^^^^^^^^ +Perl dependencies +^^^^^^^^^^^^^^^^^ + +Below the download URL, you will find a "Dependencies" link, which +takes you to a page listing all of the dependencies of the package. +Packages listed as "Core module" don't need to be added as dependencies, +but all direct dependencies should be added. Don't add dependencies of +dependencies. These should be added as dependencies to the dependency, +not to your package. + +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +Passing arguments to configure +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +Packages that have non-Perl dependencies often use command-line +variables to specify their installation directory. You can pass +arguments to ``Makefile.PL`` or ``Build.PL`` by overriding +``configure_args`` like so: + +.. code-block:: python + + def configure_args(self): + expat = self.spec['expat'].prefix + + return [ + 'EXPATLIBPATH={0}'.format(expat.lib), + 'EXPATINCPATH={0}'.format(expat.include), + ] + + +^^^^^^^^^^^^^^^^^^^^^ +Alternatives to Spack +^^^^^^^^^^^^^^^^^^^^^ + +If you need to maintain a stack of Perl modules for a user and don't +want to add all of them to Spack, a good alternative is ``cpanm``. +If Perl is already installed on your system, it should come with a +``cpan`` executable. To install ``cpanm``, run the following command: + +.. code-block:: console + + $ cpan App::cpanminus + + +Now, you can install any Perl module you want by running: + +.. code-block:: console + + $ cpanm Module::Name + + +Obviously, these commands can only be run if you have root privileges. +Furthermore, ``cpanm`` is not capable of installing non-Perl dependencies. +If you need to install to your home directory or need to install a module +with non-Perl dependencies, Spack is a better option. + +^^^^^^^^^^^^^^^^^^^^^^ +External documentation +^^^^^^^^^^^^^^^^^^^^^^ + +You can find more information on installing Perl modules from source +at: http://www.perlmonks.org/?node_id=128077 + +More generic Perl module installation instructions can be found at: +http://www.cpan.org/modules/INSTALL.html diff --git a/lib/spack/docs/build_systems/pythonpackage.rst b/lib/spack/docs/build_systems/pythonpackage.rst new file mode 100644 index 0000000000..4b916e2c4a --- /dev/null +++ b/lib/spack/docs/build_systems/pythonpackage.rst @@ -0,0 +1,742 @@ +.. _pythonpackage: + +------------- +PythonPackage +------------- + +Python packages and modules have their own special build system. + +^^^^^^ +Phases +^^^^^^ + +The ``PythonPackage`` base class provides the following phases that +can be overridden: + +* ``build`` +* ``build_py`` +* ``build_ext`` +* ``build_clib`` +* ``build_scripts`` +* ``clean`` +* ``install`` +* ``install_lib`` +* ``install_headers`` +* ``install_scripts`` +* ``install_data`` +* ``sdist`` +* ``register`` +* ``bdist`` +* ``bdist_dumb`` +* ``bdist_rpm`` +* ``bdist_wininst`` +* ``upload`` +* ``check`` + +These are all standard ``setup.py`` commands and can be found by running: + +.. code-block:: console + + $ python setup.py --help-commands + + +By default, only the ``build`` and ``install`` phases are run: + +#. ``build`` - build everything needed to install +#. ``install`` - install everything from build directory + +If for whatever reason you need to run more phases, simply modify your +``phases`` list like so: + +.. code-block:: python + + phases = ['build_ext', 'install', 'bdist'] + + +Each phase provides a function ``<phase>`` that runs: + +.. code-block:: console + + $ python -s setup.py --no-user-cfg <phase> + + +Each phase also has a ``<phase_args>`` function that can pass arguments to +this call. All of these functions are empty except for the ``install_args`` +function, which passes ``--prefix=/path/to/installation/prefix``. There is +also some additional logic specific to setuptools and eggs. + +If you need to run a phase that is not a standard ``setup.py`` command, +you'll need to define a function for it like so: + +.. code-block:: python + + phases = ['configure', 'build', 'install'] + + def configure(self, spec, prefix): + self.setup_py('configure') + + +^^^^^^^^^^^^^^^ +Important files +^^^^^^^^^^^^^^^ + +Python packages can be identified by the presence of a ``setup.py`` file. +This file is used by package managers like ``pip`` to determine a +package's dependencies and the version of dependencies required, so if +the ``setup.py`` file is not accurate, the package will not build properly. +For this reason, the ``setup.py`` file should be fairly reliable. If the +documentation and ``setup.py`` disagree on something, the ``setup.py`` +file should be considered to be the truth. As dependencies are added or +removed, the documentation is much more likely to become outdated than +the ``setup.py``. + +^^^^^^^^^^^^^^^^^^^^^^^ +Finding Python packages +^^^^^^^^^^^^^^^^^^^^^^^ + +The vast majority of Python packages are hosted on PyPI - The Python +Package Index. ``pip`` only supports packages hosted on PyPI, making +it the only option for developers who want a simple installation. +Search for "PyPI <package-name>" to find the download page. Note that +some pages are versioned, and the first result may not be the newest +version. Click on the "Latest Version" button to the top right to see +if a newer version is available. The download page is usually at: +https://pypi.org/project/<package-name> + +^^^^^^^^^^^ +Description +^^^^^^^^^^^ + +The top of the PyPI downloads page contains a description of the +package. The first line is usually a short description, while there +may be a several line "Project Description" that follows. Choose whichever +is more useful. You can also get these descriptions on the command-line +using: + +.. code-block:: console + + $ python setup.py --description + $ python setup.py --long-description + + +^^^^^^^^ +Homepage +^^^^^^^^ + +Package developers use ``setup.py`` to upload new versions to PyPI. +The ``setup`` method often passes metadata like ``homepage`` to PyPI. +This metadata is displayed on the left side of the download page. +Search for the text "Homepage" under "Project links" to find it. You +should use this page instead of the PyPI page if they differ. You can +also get the homepage on the command-line by running: + +.. code-block:: console + + $ python setup.py --url + + +^^^ +URL +^^^ + +You may have noticed that Spack allows you to add multiple versions of +the same package without adding multiple versions of the download URL. +It does this by guessing what the version string in the URL is and +replacing this with the requested version. Obviously, if Spack cannot +guess the version correctly, or if non-version-related things change +in the URL, Spack cannot substitute the version properly. + +Once upon a time, PyPI offered nice, simple download URLs like: +https://pypi.python.org/packages/source/n/numpy/numpy-1.13.1.zip + +As you can see, the version is 1.13.1. It probably isn't hard to guess +what URL to use to download version 1.12.0, and Spack was perfectly +capable of performing this calculation. + +However, PyPI switched to a new download URL format: +https://pypi.python.org/packages/c0/3a/40967d9f5675fbb097ffec170f59c2ba19fc96373e73ad47c2cae9a30aed/numpy-1.13.1.zip#md5=2c3c0f4edf720c3a7b525dacc825b9ae + +and more recently: +https://files.pythonhosted.org/packages/b0/2b/497c2bb7c660b2606d4a96e2035e92554429e139c6c71cdff67af66b58d2/numpy-1.14.3.zip + +As you can imagine, it is impossible for Spack to guess what URL to +use to download version 1.12.0 given this URL. There is a solution, +however. PyPI offers a new hidden interface for downloading +Python packages that does not include a hash in the URL: +https://pypi.io/packages/source/n/numpy/numpy-1.13.1.zip + +This URL redirects to the files.pythonhosted.org URL. The general syntax for +this pypi.io URL is: +https://pypi.io/packages/source/<first-letter-of-name>/<name>/<name>-<version>.<extension> + +Please use the pypi.io URL instead of the pypi.python.org URL. If both +``.tar.gz`` and ``.zip`` versions are available, ``.tar.gz`` is preferred. +If some releases offer both ``.tar.gz`` and ``.zip`` versions, but some +only offer ``.zip`` versions, use ``.zip``. + +""""""""""""""" +PyPI vs. GitHub +""""""""""""""" + +Many packages are hosted on PyPI, but are developed on GitHub and other +version control systems. The tarball can be downloaded from either +location, but PyPI is preferred for the following reasons: + +#. PyPI contains the bare minimum of files to install the package. + + You may notice that the tarball you download from PyPI does not + have the same checksum as the tarball you download from GitHub. + When a developer uploads a new release to PyPI, it doesn't contain + every file in the repository, only the files necessary to install + the package. PyPI tarballs are therefore smaller. + +#. PyPI is the official source for package managers like ``pip``. + + Let's be honest, ``pip`` is much more popular than Spack. If the + GitHub tarball contains a file not present in the PyPI tarball that + causes a bug, the developers may not realize this for quite some + time. If the bug was in a file contained in the PyPI tarball, users + would notice the bug much more quickly. + +#. GitHub release may be a beta version. + + When a developer releases a new version of a package on GitHub, + it may not be intended for most users. Until that release also + makes its way to PyPI, it should be assumed that the release is + not yet ready for general use. + +#. The checksum for a GitHub release may change. + + Unfortunately, some developers have a habit of patching releases + without incrementing the version number. This results in a change + in tarball checksum. Package managers like Spack that use checksums + to verify the integrity of a download tarball grind to a halt when + the checksum for a known version changes. Most of the time, the + change is intentional, and contains a needed bug fix. However, + sometimes the change indicates a download source that has been + compromised, and a tarball that contains a virus. If this happens, + you must contact the developers to determine which is the case. + PyPI is nice because it makes it physically impossible to + re-release the same version of a package with a different checksum. + +There are some reasons to prefer downloading from GitHub: + +#. The GitHub tarball may contain unit tests + + As previously mentioned, the PyPI tarball contains the bare minimum + of files to install the package. Unless explicitly specified by the + developers, it will not contain development files like unit tests. + If you desire to run the unit tests during installation, you should + use the GitHub tarball instead. + +#. Spack does not yet support ``spack versions`` and ``spack checksum`` + with PyPI URLs + + These commands work just fine with GitHub URLs. This is a minor + annoyance, not a reason to prefer GitHub over PyPI. + +If you really want to run these unit tests, no one will stop you from +submitting a PR for a new package that downloads from GitHub. + +^^^^^^^^^^^^^^^^^^^^^^^^^ +Build system dependencies +^^^^^^^^^^^^^^^^^^^^^^^^^ + +There are a few dependencies common to the ``PythonPackage`` build system. + +"""""" +Python +"""""" + +Obviously, every ``PythonPackage`` needs Python at build-time to run +``python setup.py build && python setup.py install``. Python is also +needed at run-time if you want to import the module. Due to backwards +incompatible changes between Python 2 and 3, it is very important to +specify which versions of Python are supported. If the documentation +mentions that Python 3 is required, this can be specified as: + +.. code-block:: python + + depends_on('python@3:', type=('build', 'run') + + +If Python 2 is required, this would look like: + +.. code-block:: python + + depends_on('python@:2', type=('build', 'run') + + +If Python 2.7 is the only version that works, you can use: + +.. code-block:: python + + depends_on('python@2.7:2.8', type=('build', 'run') + + +The documentation may not always specify supported Python versions. +Another place to check is in the ``setup.py`` file. Look for a line +containing ``python_requires``. An example from +`py-numpy <https://github.com/spack/spack/blob/develop/var/spack/repos/builtin/packages/py-numpy/package.py>`_ +looks like: + +.. code-block:: python + + python_requires='>=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*' + + +More commonly, you will find a version check at the top of the file: + +.. code-block:: python + + if sys.version_info[:2] < (2, 7) or (3, 0) <= sys.version_info[:2] < (3, 4): + raise RuntimeError("Python version 2.7 or >= 3.4 required.") + + +This can be converted to Spack's spec notation like so: + +.. code-block:: python + + depends_on('python@2.7:2.8,3.4:', type=('build', 'run')) + + +"""""""""" +setuptools +"""""""""" + +Originally, the Python language had a single build system called +distutils, which is built into Python. Distutils provided a common +framework for package authors to describe their project and how it +should be built. However, distutils was not without limitations. +Most notably, there was no way to list a project's dependencies +with distutils. Along came setuptools, a non-builtin build system +designed to overcome the limitations of distutils. Both projects +use a similar API, making the transition easy while adding much +needed functionality. Today, setuptools is used in around 75% of +the Python packages in Spack. + +Since setuptools isn't built-in to Python, you need to add it as a +dependency. To determine whether or not a package uses setuptools, +search the file for an import statement like: + +.. code-block:: python + + import setuptools + + +or: + +.. code-block:: python + + from setuptools import setup + + +Some packages are designed to work with both setuptools and distutils, +so you may find something like: + +.. code-block:: python + + try: + from setuptools import setup + except ImportError: + from distutils.core import setup + + +This uses setuptools if available, and falls back to distutils if not. +In this case, you would still want to add a setuptools dependency, as +it offers us more control over the installation. + +Unless specified otherwise, setuptools is usually a build-only dependency. +That is, it is needed to install the software, but is not needed at +run-time. This can be specified as: + +.. code-block:: python + + depends_on('py-setuptools', type='build') + + +"""""" +cython +"""""" + +Compared to compiled languages, interpreted languages like Python can +be quite a bit slower. To work around this, some Python developers +rewrite computationally demanding sections of code in C, a process +referred to as "cythonizing". In order to build these package, you +need to add a build dependency on cython: + +.. code-block:: python + + depends_on('py-cython', type='build') + + +Look for references to "cython" in the ``setup.py`` to determine +whether or not this is necessary. Cython may be optional, but +even then you should list it as a required dependency. Spack is +designed to compile software, and is meant for HPC facilities +where speed is crucial. There is no reason why someone would not +want an optimized version of a library instead of the pure-Python +version. + +^^^^^^^^^^^^^^^^^^^ +Python dependencies +^^^^^^^^^^^^^^^^^^^ + +When you install a package with ``pip``, it reads the ``setup.py`` +file in order to determine the dependencies of the package. +If the dependencies are not yet installed, ``pip`` downloads them +and installs them for you. This may sound convenient, but Spack +cannot rely on this behavior for two reasons: + +#. Spack needs to be able to install packages on air-gapped networks. + + If there is no internet connection, ``pip`` can't download the + package dependencies. By explicitly listing every dependency in + the ``package.py``, Spack knows what to download ahead of time. + +#. Duplicate installations of the same dependency may occur. + + Spack supports *activation* of Python extensions, which involves + symlinking the package installation prefix to the Python installation + prefix. If your package is missing a dependency, that dependency + will be installed to the installation directory of the same package. + If you try to activate the package + dependency, it may cause a + problem if that package has already been activated. + +For these reasons, you must always explicitly list all dependencies. +Although the documentation may list the package's dependencies, +often the developers assume people will use ``pip`` and won't have to +worry about it. Always check the ``setup.py`` to find the true +dependencies. + +If the package relies on ``distutils``, it may not explicitly list its +dependencies. Check for statements like: + +.. code-block:: python + + try: + import numpy + except ImportError: + raise ImportError("numpy must be installed prior to installation") + + +Obviously, this means that ``py-numpy`` is a dependency. + +If the package uses ``setuptools``, check for the following clues: + +* ``install_requires`` + + These packages are required for installation. + +* ``extra_requires`` + + These packages are optional dependencies that enable additional + functionality. You should add a variant that optionally adds these + dependencies. + +* ``test_requires`` + + These are packages that are required to run the unit tests for the + package. These dependencies can be specified using the + ``type='test'`` dependency type. + +In the root directory of the package, you may notice a +``requirements.txt`` file. It may look like this file contains a list +of all of the package's dependencies. Don't be fooled. This file is +used by tools like Travis to install the pre-requisites for the +package... and a whole bunch of other things. It often contains +dependencies only needed for unit tests, like: + +* mock +* nose +* pytest + +It can also contain dependencies for building the documentation, like +sphinx. If you can't find any information about the package's +dependencies, you can take a look in ``requirements.txt``, but be sure +not to add test or documentation dependencies. + +"""""""""" +setuptools +"""""""""" + +Setuptools is a bit of a special case. If a package requires setuptools +at run-time, how do they express this? They could add it to +``install_requires``, but setuptools is imported long before this and +needed to read this line. And since you can't install the package +without setuptools, the developers assume that setuptools will already +be there, so they never mention when it is required. We don't want to +add run-time dependencies if they aren't needed, so you need to +determine whether or not setuptools is needed. Grep the installation +directory for any files containing a reference to ``setuptools`` or +``pkg_resources``. Both modules come from ``py-setuptools``. +``pkg_resources`` is particularly common in scripts in ``prefix/bin``. + +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +Passing arguments to setup.py +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +The default build and install phases should be sufficient to install +most packages. However, you may want to pass additional flags to +either phase. + +You can view the available options for a particular phase with: + +.. code-block:: console + + $ python setup.py <phase> --help + + +Each phase provides a ``<phase_args>`` function that can be used to +pass arguments to that phase. For example, +`py-numpy <https://github.com/spack/spack/blob/develop/var/spack/repos/builtin/packages/py-numpy/package.py>`_ +adds: + +.. code-block:: python + + def build_args(self, spec, prefix): + args = [] + + # From NumPy 1.10.0 on it's possible to do a parallel build. + if self.version >= Version('1.10.0'): + # But Parallel build in Python 3.5+ is broken. See: + # https://github.com/spack/spack/issues/7927 + # https://github.com/scipy/scipy/issues/7112 + if spec['python'].version < Version('3.5'): + args = ['-j', str(make_jobs)] + + return args + + +^^^^^^^ +Testing +^^^^^^^ + +``PythonPackage`` provides a couple of options for testing packages. + +"""""""""""" +Import tests +"""""""""""" + +Just because a package successfully built does not mean that it built +correctly. The most reliable test of whether or not the package was +correctly installed is to attempt to import all of the modules that +get installed. To get a list of modules, run the following command +in the source directory: + +.. code-block:: console + + $ python + >>> import setuptools + >>> setuptools.find_packages() + ['numpy', 'numpy._build_utils', 'numpy.compat', 'numpy.core', 'numpy.distutils', 'numpy.doc', 'numpy.f2py', 'numpy.fft', 'numpy.lib', 'numpy.linalg', 'numpy.ma', 'numpy.matrixlib', 'numpy.polynomial', 'numpy.random', 'numpy.testing', 'numpy.core.code_generators', 'numpy.distutils.command', 'numpy.distutils.fcompiler'] + + +Large, complex packages like ``numpy`` will return a long list of +packages, while other packages like ``six`` will return an empty list. +``py-six`` installs a single ``six.py`` file. In Python packaging lingo, +a "package" is a directory containing files like: + +.. code-block:: none + + foo/__init__.py + foo/bar.py + foo/baz.py + + +whereas a "module" is a single Python file. Since ``find_packages`` +only returns packages, you'll have to determine the correct module +names yourself. You can now add these packages and modules to the +package like so: + +.. code-block:: python + + import_modules = ['six'] + + +When you run ``spack install --test=root py-six``, Spack will attempt +to import the ``six`` module after installation. + +These tests most often catch missing dependencies and non-RPATHed +libraries. Make sure not to add modules/packages containing the word +"test", as these likely won't end up in installation directory. + +"""""""""" +Unit tests +"""""""""" + +The package you want to install may come with additional unit tests. +By default, Spack runs: + +.. code-block:: console + + $ python setup.py test + + +if it detects that the ``setup.py`` file supports a ``test`` phase. +You can add additional build-time or install-time tests by overriding +``test`` and ``installtest``, respectively. For example, ``py-numpy`` +adds: + +.. code-block:: python + + def install_test(self): + with working_dir('..'): + python('-c', 'import numpy; numpy.test("full", verbose=2)') + + +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +Setup file in a sub-directory +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +In order to be compatible with package managers like ``pip``, the package +is required to place its ``setup.py`` in the root of the tarball. However, +not every Python package cares about ``pip`` or PyPI. If you are installing +a package that is not hosted on PyPI, you may find that it places its +``setup.py`` in a sub-directory. To handle this, add the directory containing +``setup.py`` to the package like so: + +.. code-block:: python + + build_directory = 'source' + + +^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +Alternate names for setup.py +^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +As previously mentioned, packages need to call their setup script ``setup.py`` +in order to be compatible with package managers like ``pip``. However, some +packages like +`py-meep <https://github.com/spack/spack/blob/develop/var/spack/repos/builtin/packages/py-meep/package.py>`_ and +`py-adios <https://github.com/spack/spack/blob/develop/var/spack/repos/builtin/packages/py-adios/package.py>`_ +come with multiple setup scripts, one for a serial build and another for a +parallel build. You can override the default name to use like so: + +.. code-block:: python + + def setup_file(self): + return 'setup-mpi.py' if '+mpi' in self.spec else 'setup.py' + + +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +PythonPackage vs. packages that use Python +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +There are many packages that make use of Python, but packages that depend +on Python are not necessarily ``PythonPackages``. + +""""""""""""""""""""""" +Choosing a build system +""""""""""""""""""""""" + +First of all, you need to select a build system. ``spack create`` usually +does this for you, but if for whatever reason you need to do this manually, +choose ``PythonPackage`` if and only if the package contains a ``setup.py`` +file. + +""""""""""""""""""""""" +Choosing a package name +""""""""""""""""""""""" + +Selecting the appropriate package name is a little more complicated +than choosing the build system. By default, ``spack create`` will +prepend ``py-`` to the beginning of the package name if it detects +that the package uses the ``PythonPackage`` build system. However, there +are occasionally packages that use ``PythonPackage`` that shouldn't +start with ``py-``. For example: + +* busco +* easybuild +* httpie +* mercurial +* scons +* snakemake + +The thing these packages have in common is that they are command-line +tools that just so happen to be written in Python. Someone who wants +to install ``mercurial`` with Spack isn't going to realize that it is +written in Python, and they certainly aren't going to assume the package +is called ``py-mercurial``. For this reason, we manually renamed the +package to ``mercurial``. + +Likewise, there are occasionally packages that don't use the +``PythonPackage`` build system but should still be prepended with ``py-``. +For example: + +* py-genders +* py-py2cairo +* py-pygobject +* py-pygtk +* py-pyqt +* py-pyserial +* py-sip +* py-xpyb + +These packages are primarily used as Python libraries, not as +command-line tools. You may see C/C++ packages that have optional +Python language-bindings, such as: + +* antlr +* cantera +* conduit +* pagmo +* vtk + +Don't prepend these kind of packages with ``py-``. When in doubt, +think about how this package will be used. Is it primarily a Python +library that will be imported in other Python scripts? Or is it a +command-line tool, or C/C++/Fortran program with optional Python +modules? The former should be prepended with ``py-``, while the +latter should not. + +"""""""""""""""""""""" +extends vs. depends_on +"""""""""""""""""""""" + +This is very similar to the naming dilemma above, with a slight twist. +As mentioned in the :ref:`Packaging Guide <packaging_extensions>`, +``extends`` and ``depends_on`` are very similar, but ``extends`` adds +the ability to *activate* the package. Activation involves symlinking +everything in the installation prefix of the package to the installation +prefix of Python. This allows the user to import a Python module without +having to add that module to ``PYTHONPATH``. + +When deciding between ``extends`` and ``depends_on``, the best rule of +thumb is to check the installation prefix. If Python libraries are +installed to ``prefix/lib/python2.7/site-packages`` (where 2.7 is the +MAJOR.MINOR version of Python you used to install the package), then +you should use ``extends``. If Python libraries are installed elsewhere +or the only files that get installed reside in ``prefix/bin``, then +don't use ``extends``, as symlinking the package wouldn't be useful. + +^^^^^^^^^^^^^^^^^^^^^ +Alternatives to Spack +^^^^^^^^^^^^^^^^^^^^^ + +PyPI has hundreds of thousands of packages that are not yet in Spack, +and ``pip`` may be a perfectly valid alternative to using Spack. The +main advantage of Spack over ``pip`` is its ability to compile +non-Python dependencies. It can also build cythonized versions of a +package or link to an optimized BLAS/LAPACK library like MKL, +resulting in calculations that run orders of magnitude faster. +Spack does not offer a significant advantage to other python-management +systems for installing and using tools like flake8 and sphinx. +But if you need packages with non-Python dependencies like +numpy and scipy, Spack will be very valuable to you. + +Anaconda is another great alternative to Spack, and comes with its own +``conda`` package manager. Like Spack, Anaconda is capable of compiling +non-Python dependencies. Anaconda contains many Python packages that +are not yet in Spack, and Spack contains many Python packages that are +not yet in Anaconda. The main advantage of Spack over Anaconda is its +ability to choose a specific compiler and BLAS/LAPACK or MPI library. +Spack also has better platform support for supercomputers. On the +other hand, Anaconda offers Windows support. + +^^^^^^^^^^^^^^^^^^^^^^ +External documentation +^^^^^^^^^^^^^^^^^^^^^^ + +For more information on Python packaging, see: +https://packaging.python.org/ diff --git a/lib/spack/docs/build_systems/qmakepackage.rst b/lib/spack/docs/build_systems/qmakepackage.rst new file mode 100644 index 0000000000..98f908bdb7 --- /dev/null +++ b/lib/spack/docs/build_systems/qmakepackage.rst @@ -0,0 +1,111 @@ +.. _qmakepackage: + +------------ +QMakePackage +------------ + +Much like Autotools and CMake, QMake is a build-script generator +designed by the developers of Qt. In its simplest form, Spack's +``QMakePackage`` runs the following steps: + +.. code-block:: console + + $ qmake + $ make + $ make check # optional + $ make install + + +QMake does not appear to have a standardized way of specifying +the installation directory, so you may have to set environment +variables or edit ``*.pro`` files to get things working properly. + +^^^^^^ +Phases +^^^^^^ + +The ``QMakePackage`` base class comes with the following phases: + +#. ``qmake`` - generate Makefiles +#. ``build`` - build the project +#. ``install`` - install the project + +By default, these phases run: + +.. code-block:: console + + $ qmake + $ make + $ make install + + +Any of these phases can be overridden in your package as necessary. +There is also a ``check`` method that looks for a ``check`` target +in the Makefile. If a ``check`` target exists and the user runs: + +.. code-block:: console + + $ spack install --test=root <qmake-package> + + +Spack will run ``make check`` after the build phase. + +^^^^^^^^^^^^^^^ +Important files +^^^^^^^^^^^^^^^ + +Packages that use the QMake build system can be identified by the +presence of a ``<project-name>.pro`` file. This file declares things +like build instructions and dependencies. + +One thing to look for is the ``minQtVersion`` function: + +.. code-block:: none + + minQtVersion(5, 6, 0) + + +This means that Qt 5.6.0 is the earliest release that will work. +You should specify this in a ``depends_on`` statement. + +^^^^^^^^^^^^^^^^^^^^^^^^^ +Build system dependencies +^^^^^^^^^^^^^^^^^^^^^^^^^ + +At the bare minimum, packages that use the QMake build system need a +``qt`` dependency. Since this is always the case, the ``QMakePackage`` +base class already contains: + +.. code-block:: python + + depends_on('qt', type='build') + + +If you want to specify a particular version requirement, or need to +link to the ``qt`` libraries, you can override this in your package: + +.. code-block:: python + + depends_on('qt@5.6.0:') + +^^^^^^^^^^^^^^^^^^^^^^^^^^ +Passing arguments to qmake +^^^^^^^^^^^^^^^^^^^^^^^^^^ + +If you need to pass any arguments to the ``qmake`` call, you can +override the ``qmake_args`` method like so: + +.. code-block:: python + + def qmake_args(self): + return ['-recursive'] + + +This method can be used to pass flags as well as variables. + +^^^^^^^^^^^^^^^^^^^^^^ +External documentation +^^^^^^^^^^^^^^^^^^^^^^ + +For more information on the QMake build system, see: +http://doc.qt.io/qt-5/qmake-manual.html diff --git a/lib/spack/docs/build_systems/rpackage.rst b/lib/spack/docs/build_systems/rpackage.rst new file mode 100644 index 0000000000..170bc6ffdf --- /dev/null +++ b/lib/spack/docs/build_systems/rpackage.rst @@ -0,0 +1,341 @@ +.. _rpackage: + +-------- +RPackage +-------- + +Like Python, R has its own built-in build system. + +The R build system is remarkably uniform and well-tested. +This makes it one of the easiest build systems to create +new Spack packages for. + +^^^^^^ +Phases +^^^^^^ + +The ``RPackage`` base class has a single phase: + +#. ``install`` - install the package + +By default, this phase runs the following command: + +.. code-block:: console + + $ R CMD INSTALL --library=/path/to/installation/prefix/rlib/R/library . + + +^^^^^^^^^^^^^^^^^^ +Finding R packages +^^^^^^^^^^^^^^^^^^ + +The vast majority of R packages are hosted on CRAN - The Comprehensive +R Archive Network. If you are looking for a particular R package, search +for "CRAN <package-name>" and you should quickly find what you want. +If it isn't on CRAN, try Bioconductor, another common R repository. + +For the purposes of this tutorial, we will be walking through +`r-caret <https://github.com/spack/spack/blob/develop/var/spack/repos/builtin/packages/r-caret/package.py>`_ +as an example. If you search for "CRAN caret", you will quickly find what +you are looking for at https://cran.r-project.org/web/packages/caret/index.html. +If you search for "Package source", you will find the download URL for +the latest release. Use this URL with ``spack create`` to create a new +package. + +^^^^^^^^^^^^ +Package name +^^^^^^^^^^^^ + +The first thing you'll notice is that Spack prepends ``r-`` to the front +of the package name. This is how Spack separates R package extensions +from the rest of the packages in Spack. Without this, we would end up +with package name collisions more frequently than we would like. For +instance, there are already packages for both: + +* ``ape`` and ``r-ape`` +* ``curl`` and ``r-curl`` +* ``gmp`` and ``r-gmp`` +* ``jpeg`` and ``r-jpeg`` +* ``openssl`` and ``r-openssl`` +* ``uuid`` and ``r-uuid`` +* ``xts`` and ``r-xts`` + +Many popular programs written in C/C++ are later ported to R as a +separate project. + +^^^^^^^^^^^ +Description +^^^^^^^^^^^ + +The first thing you'll need to add to your new package is a description. +The top of the homepage for ``caret`` lists the following description: + + caret: Classification and Regression Training + + Misc functions for training and plotting classification and regression models. + +You can either use the short description (first line), long description +(second line), or both depending on what you feel is most appropriate. + +^^^^^^^^ +Homepage +^^^^^^^^ + +If you look at the bottom of the page, you'll see: + + Linking: + + Please use the canonical form https://CRAN.R-project.org/package=caret to link to this page. + +Please uphold the wishes of the CRAN admins and use +https://CRAN.R-project.org/package=caret as the homepage instead of +https://cran.r-project.org/web/packages/caret/index.html. The latter may +change without notice. + +^^^ +URL +^^^ + +As previously mentioned, the download URL for the latest release can be +found by searching "Package source" on the homepage. + +^^^^^^^^ +List URL +^^^^^^^^ + +CRAN maintains a single webpage containing the latest release of every +single package: https://cran.r-project.org/src/contrib/ + +Of course, as soon as a new release comes out, the version you were using +in your package is no longer available at that URL. It is moved to an +archive directory. If you search for "Old sources", you will find: +https://cran.r-project.org/src/contrib/Archive/caret + +If you only specify the URL for the latest release, your package will +no longer be able to fetch that version as soon as a new release comes +out. To get around this, add the archive directory as a ``list_url``. + +^^^^^^^^^^^^^^^^^^^^^^^^^ +Build system dependencies +^^^^^^^^^^^^^^^^^^^^^^^^^ + +As an extension of the R ecosystem, your package will obviously depend +on R to build and run. Normally, we would use ``depends_on`` to express +this, but for R packages, we use ``extends``. ``extends`` is similar to +``depends_on``, but adds an additional feature: the ability to "activate" +the package by symlinking it to the R installation directory. Since +every R package needs this, the ``RPackage`` base class contains: + +.. code-block:: python + + extends('r') + depends_on('r', type=('build', 'run')) + + +Take a close look at the homepage for ``caret``. If you look at the +"Depends" section, you'll notice that ``caret`` depends on "R (≥ 2.10)". +You should add this to your package like so: + +.. code-block:: python + + depends_on('r@2.10:', type=('build', 'run')) + + +^^^^^^^^^^^^^^ +R dependencies +^^^^^^^^^^^^^^ + +R packages are often small and follow the classic Unix philosophy +of doing one thing well. They are modular and usually depend on +several other packages. You may find a single package with over a +hundred dependencies. Luckily, CRAN packages are well-documented +and list all of their dependencies in the following sections: + +* Depends +* Imports +* LinkingTo + +As far as Spack is concerned, all 3 of these dependency types +correspond to ``type=('build', 'run')``, so you don't have to worry +about them. If you are curious what they mean, +https://github.com/spack/spack/issues/2951 has a pretty good summary: + + ``Depends`` is required and will cause those R packages to be *attached*, + that is, their APIs are exposed to the user. ``Imports`` *loads* packages + so that *the package* importing these packages can access their APIs, + while *not* being exposed to the user. When a user calls ``library(foo)`` + s/he *attaches* package ``foo`` and all of the packages under ``Depends``. + Any function in one of these package can be called directly as ``bar()``. + If there are conflicts, user can also specify ``pkgA::bar()`` and + ``pkgB::bar()`` to distinguish between them. Historically, there was only + ``Depends`` and ``Suggests``, hence the confusing names. Today, maybe + ``Depends`` would have been named ``Attaches``. + + The ``LinkingTo`` is not perfect and there was recently an extensive + discussion about API/ABI among other things on the R-devel mailing + list among very skilled R developers: + + * https://stat.ethz.ch/pipermail/r-devel/2016-December/073505.html + * https://stat.ethz.ch/pipermail/r-devel/2017-January/073647.html + +Some packages also have a fourth section: + +* Suggests + +These are optional, rarely-used dependencies that a user might find +useful. You should **NOT** add these dependencies to your package. +R packages already have enough dependencies as it is, and adding +optional dependencies can really slow down the concretization +process. They can also introduce circular dependencies. + +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +Core, recommended, and non-core packages +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +If you look at "Depends", "Imports", and "LinkingTo", you will notice +3 different types of packages: + +""""""""""""" +Core packages +""""""""""""" + +If you look at the ``caret`` homepage, you'll notice a few dependencies +that don't have a link to the package, like ``methods``, ``stats``, and +``utils``. These packages are part of the core R distribution and are +tied to the R version installed. You can basically consider these to be +"R itself". These are so essential to R so it would not make sense that +they could be updated via CRAN. If so, you would basically get a different +version of R. Thus, they're updated when R is updated. + +You can find a list of these core libraries at: +https://github.com/wch/r-source/tree/trunk/src/library + +"""""""""""""""""""" +Recommended packages +"""""""""""""""""""" + +When you install R, there is an option called ``--with-recommended-packages``. +This flag causes the R installation to include a few "Recommended" packages +(legacy term). They are for historical reasons quite tied to the core R +distribution, developed by the R core team or people closely related to it. +The R core distribution "knows" about these package, but they are indeed +distributed via CRAN. Because they're distributed via CRAN, they can also be +updated between R version releases. + +Spack explicitly adds the ``--without-recommended-packages`` flag to prevent +the installation of these packages. Due to the way Spack handles package +activation (symlinking packages to the R installation directory), +pre-existing recommended packages will cause conflicts for already-existing +files. We could either not include these recommended packages in Spack and +require them to be installed through ``--with-recommended-packages``, or +we could not install them with R and let users choose the version of the +package they want to install. We chose the latter. + +Since these packages are so commonly distributed with the R system, many +developers may assume these packages exist and fail to list them as +dependencies. Watch out for this. + +You can find a list of these recommended packages at: +https://github.com/wch/r-source/blob/trunk/share/make/vars.mk + +""""""""""""""""" +Non-core packages +""""""""""""""""" + +These are packages that are neither "core" nor "recommended". There are more +than 10,000 of these packages hosted on CRAN alone. + +For each of these package types, if you see that a specific version is +required, for example, "lattice (≥ 0.20)", please add this information to +the dependency: + +.. code-block:: python + + depends_on('r-lattice@0.20:', type=('build', 'run')) + + +^^^^^^^^^^^^^^^^^^ +Non-R dependencies +^^^^^^^^^^^^^^^^^^ + +Some packages depend on non-R libraries for linking. Check out the +`r-stringi <https://github.com/spack/spack/blob/develop/var/spack/repos/builtin/packages/r-stringi/package.py>`_ +package for an example: https://CRAN.R-project.org/package=stringi. +If you search for the text "SystemRequirements", you will see: + + ICU4C (>= 52, optional) + +This is how non-R dependencies are listed. Make sure to add these +dependencies. The default dependency type should suffice. + +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +Passing arguments to the installation +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +Some R packages provide additional flags that can be passed to +``R CMD INSTALL``, often to locate non-R dependencies. +`r-rmpi <https://github.com/spack/spack/blob/develop/var/spack/repos/builtin/packages/r-rmpi/package.py>`_ +is an example of this, and flags for linking to an MPI library. To pass +these to the installation command, you can override ``configure_args`` +like so: + +.. code-block:: python + + def configure_args(self, spec, prefix): + mpi_name = spec['mpi'].name + + # The type of MPI. Supported values are: + # OPENMPI, LAM, MPICH, MPICH2, or CRAY + if mpi_name == 'openmpi': + Rmpi_type = 'OPENMPI' + elif mpi_name == 'mpich': + Rmpi_type = 'MPICH2' + else: + raise InstallError('Unsupported MPI type') + + return [ + '--with-Rmpi-type={0}'.format(Rmpi_type), + '--with-mpi={0}'.format(spec['mpi'].prefix), + ] + + +There is a similar ``configure_vars`` function that can be overridden +to pass variables to the build. + +^^^^^^^^^^^^^^^^^^^^^ +Alternatives to Spack +^^^^^^^^^^^^^^^^^^^^^ + +CRAN hosts over 10,000 R packages, most of which are not in Spack. Many +users may not need the advanced features of Spack, and may prefer to +install R packages the normal way: + +.. code-block:: console + + $ R + > install.packages("ggplot2") + + +R will search CRAN for the ``ggplot2`` package and install all necessary +dependencies for you. If you want to update all installed R packages to +the latest release, you can use: + +.. code-block:: console + + > update.packages(ask = FALSE) + + +This works great for users who have internet access, but those on an +air-gapped cluster will find it easier to let Spack build a download +mirror and install these packages for you. + +Where Spack really shines is its ability to install non-R dependencies +and link to them properly, something the R installation mechanism +cannot handle. + +^^^^^^^^^^^^^^^^^^^^^^ +External documentation +^^^^^^^^^^^^^^^^^^^^^^ + +For more information on installing R packages, see: +https://stat.ethz.ch/R-manual/R-devel/library/utils/html/INSTALL.html diff --git a/lib/spack/docs/build_systems/rubypackage.rst b/lib/spack/docs/build_systems/rubypackage.rst new file mode 100644 index 0000000000..06a6927914 --- /dev/null +++ b/lib/spack/docs/build_systems/rubypackage.rst @@ -0,0 +1,11 @@ +.. _rubypackage: + +----------- +RubyPackage +----------- + +Like Perl, Python, and R, Ruby has its own build system for +installing Ruby gems. + +This build system is a work-in-progress. See +https://github.com/spack/spack/pull/3127 for more information. diff --git a/lib/spack/docs/build_systems/sconspackage.rst b/lib/spack/docs/build_systems/sconspackage.rst new file mode 100644 index 0000000000..6be41ee0d8 --- /dev/null +++ b/lib/spack/docs/build_systems/sconspackage.rst @@ -0,0 +1,301 @@ +.. _sconspackage: + +------------ +SConsPackage +------------ + +SCons is a general-purpose build system that does not rely on +Makefiles to build software. SCons is written in Python, and handles +all building and linking itself. + +As far as build systems go, SCons is very non-uniform. It provides a +common framework for developers to write build scripts, but the build +scripts themselves can vary drastically. Some developers add subcommands +like: + +.. code-block:: console + + $ scons clean + $ scons build + $ scons test + $ scons install + + +Others don't add any subcommands. Some have configuration options that +can be specified through variables on the command line. Others don't. + +^^^^^^ +Phases +^^^^^^ + +As previously mentioned, SCons allows developers to add subcommands like +``build`` and ``install``, but by default, installation usually looks like: + +.. code-block:: console + + $ scons + $ scons install + + +To facilitate this, the ``SConsPackage`` base class provides the +following phases: + +#. ``build`` - build the package +#. ``install`` - install the package + +Package developers often add unit tests that can be invoked with +``scons test`` or ``scons check``. Spack provides a ``test`` method +to handle this. Since we don't know which one the package developer +chose, the ``test`` method does nothing by default, but can be easily +overridden like so: + +.. code-block:: python + + def test(self): + scons('check') + + +^^^^^^^^^^^^^^^ +Important files +^^^^^^^^^^^^^^^ + +SCons packages can be identified by their ``SConstruct`` files. These +files handle everything from setting up subcommands and command-line +options to linking and compiling. + +One thing to look for is the ``EnsureSConsVersion`` function: + +.. code-block:: none + + EnsureSConsVersion(2, 3, 0) + + +This means that SCons 2.3.0 is the earliest release that will work. +You should specify this in a ``depends_on`` statement. + +^^^^^^^^^^^^^^^^^^^^^^^^^ +Build system dependencies +^^^^^^^^^^^^^^^^^^^^^^^^^ + +At the bare minimum, packages that use the SCons build system need a +``scons`` dependency. Since this is always the case, the ``SConsPackage`` +base class already contains: + +.. code-block:: python + + depends_on('scons', type='build') + + +If you want to specify a particular version requirement, you can override +this in your package: + +.. code-block:: python + + depends_on('scons@2.3.0:', type='build') + + +^^^^^^^^^^^^^^^^^^^^^^^^^ +Finding available options +^^^^^^^^^^^^^^^^^^^^^^^^^ + +The first place to start when looking for a list of valid options to +build a package is ``scons --help``. Some packages like +`kahip <https://github.com/spack/spack/blob/develop/var/spack/repos/builtin/packages/kahip/package.py>`_ +don't bother overwriting the default SCons help message, so this isn't +very useful, but other packages like +`serf <https://github.com/spack/spack/blob/develop/var/spack/repos/builtin/packages/serf/package.py>`_ +print a list of valid command-line variables: + +.. code-block:: console + + $ scons --help + scons: Reading SConscript files ... + Checking for GNU-compatible C compiler...yes + scons: done reading SConscript files. + + PREFIX: Directory to install under ( /path/to/PREFIX ) + default: /usr/local + actual: /usr/local + + LIBDIR: Directory to install architecture dependent libraries under ( /path/to/LIBDIR ) + default: $PREFIX/lib + actual: /usr/local/lib + + APR: Path to apr-1-config, or to APR's install area ( /path/to/APR ) + default: /usr + actual: /usr + + APU: Path to apu-1-config, or to APR's install area ( /path/to/APU ) + default: /usr + actual: /usr + + OPENSSL: Path to OpenSSL's install area ( /path/to/OPENSSL ) + default: /usr + actual: /usr + + ZLIB: Path to zlib's install area ( /path/to/ZLIB ) + default: /usr + actual: /usr + + GSSAPI: Path to GSSAPI's install area ( /path/to/GSSAPI ) + default: None + actual: None + + DEBUG: Enable debugging info and strict compile warnings (yes|no) + default: False + actual: False + + APR_STATIC: Enable using a static compiled APR (yes|no) + default: False + actual: False + + CC: Command name or path of the C compiler + default: None + actual: gcc + + CFLAGS: Extra flags for the C compiler (space-separated) + default: None + actual: + + LIBS: Extra libraries passed to the linker, e.g. "-l<library1> -l<library2>" (space separated) + default: None + actual: None + + LINKFLAGS: Extra flags for the linker (space-separated) + default: None + actual: + + CPPFLAGS: Extra flags for the C preprocessor (space separated) + default: None + actual: None + + Use scons -H for help about command-line options. + + +More advanced packages like +`cantera <https://github.com/spack/spack/blob/develop/var/spack/repos/builtin/packages/cantera/package.py>`_ +use ``scons --help`` to print a list of subcommands: + +.. code-block:: console + + $ scons --help + scons: Reading SConscript files ... + + SCons build script for Cantera + + Basic usage: + 'scons help' - print a description of user-specifiable options. + + 'scons build' - Compile Cantera and the language interfaces using + default options. + + 'scons clean' - Delete files created while building Cantera. + + '[sudo] scons install' - Install Cantera. + + '[sudo] scons uninstall' - Uninstall Cantera. + + 'scons test' - Run all tests which did not previously pass or for which the + results may have changed. + + 'scons test-reset' - Reset the passing status of all tests. + + 'scons test-clean' - Delete files created while running the tests. + + 'scons test-help' - List available tests. + + 'scons test-NAME' - Run the test named "NAME". + + 'scons <command> dump' - Dump the state of the SCons environment to the + screen instead of doing <command>, e.g. + 'scons build dump'. For debugging purposes. + + 'scons samples' - Compile the C++ and Fortran samples. + + 'scons msi' - Build a Windows installer (.msi) for Cantera. + + 'scons sphinx' - Build the Sphinx documentation + + 'scons doxygen' - Build the Doxygen documentation + + +You'll notice that cantera provides a ``scons help`` subcommand. Running +``scons help`` prints a list of valid command-line variables. + +^^^^^^^^^^^^^^^^^^^^^^^^^^ +Passing arguments to scons +^^^^^^^^^^^^^^^^^^^^^^^^^^ + +Now that you know what arguments the project accepts, you can add them to +the package build phase. This is done by overriding ``build_args`` like so: + +.. code-block:: python + + def build_args(self, spec, prefix): + args = [ + 'PREFIX={0}'.format(prefix), + 'ZLIB={0}'.format(spec['zlib'].prefix), + ] + + if '+debug' in spec: + args.append('DEBUG=yes') + else: + args.append('DEBUG=no') + + return args + + +``SConsPackage`` also provides an ``install_args`` function that you can +override to pass additional arguments to ``scons install``. + +^^^^^^^^^^^^^^^^^ +Compiler wrappers +^^^^^^^^^^^^^^^^^ + +By default, SCons builds all packages in a separate execution environment, +and doesn't pass any environment variables from the user environment. +Even changes to ``PATH`` are not propagated unless the package developer +does so. + +This is particularly troublesome for Spack's compiler wrappers, which depend +on environment variables to manage dependencies and linking flags. In many +cases, SCons packages are not compatible with Spack's compiler wrappers, +and linking must be done manually. + +First of all, check the list of valid options for anything relating to +environment variables. For example, cantera has the following option: + +.. code-block:: none + + * env_vars: [ string ] + Environment variables to propagate through to SCons. Either the + string "all" or a comma separated list of variable names, e.g. + 'LD_LIBRARY_PATH,HOME'. + - default: 'LD_LIBRARY_PATH,PYTHONPATH' + + +In the case of cantera, using ``env_vars=all`` allows us to use +Spack's compiler wrappers. If you don't see an option related to +environment variables, try using Spack's compiler wrappers by passing +``spack_cc``, ``spack_cxx``, and ``spack_fc`` via the ``CC``, ``CXX``, +and ``FC`` arguments, respectively. If you pass them to the build and +you see an error message like: + +.. code-block:: none + + Spack compiler must be run from Spack! Input 'SPACK_PREFIX' is missing. + + +you'll know that the package isn't compatible with Spack's compiler +wrappers. In this case, you'll have to use the path to the actual +compilers, which are stored in ``self.compiler.cc`` and friends. +Note that this may involve passing additional flags to the build to +locate dependencies, a task normally done by the compiler wrappers. +serf is an example of a package with this limitation. + +^^^^^^^^^^^^^^^^^^^^^^ +External documentation +^^^^^^^^^^^^^^^^^^^^^^ + +For more information on the SCons build system, see: +http://scons.org/documentation.html diff --git a/lib/spack/docs/build_systems/wafpackage.rst b/lib/spack/docs/build_systems/wafpackage.rst new file mode 100644 index 0000000000..3c65d4d39f --- /dev/null +++ b/lib/spack/docs/build_systems/wafpackage.rst @@ -0,0 +1,124 @@ +.. _wafpackage: + +---------- +WafPackage +---------- + +Like SCons, Waf is a general-purpose build system that does not rely +on Makefiles to build software. + +^^^^^^ +Phases +^^^^^^ + +The ``WafPackage`` base class comes with the following phases: + +#. ``configure`` - configure the project +#. ``build`` - build the project +#. ``install`` - install the project + +By default, these phases run: + +.. code-block:: console + + $ python waf configure --prefix=/path/to/installation/prefix + $ python waf build + $ python waf install + + +Each of these are standard Waf commands and can be found by running: + +.. code-block:: console + + $ python waf --help + + +Each phase provides a ``<phase>`` function that runs: + +.. code-block:: console + + $ python waf -j<jobs> <phase> + + +where ``<jobs>`` is the number of parallel jobs to build with. Each phase +also has a ``<phase_args>`` function that can pass arguments to this call. +All of these functions are empty except for the ``configure_args`` +function, which passes ``--prefix=/path/to/installation/prefix``. + +^^^^^^^ +Testing +^^^^^^^ + +``WafPackage`` also provides ``test`` and ``installtest`` methods, +which are run after the ``build`` and ``install`` phases, respectively. +By default, these phases do nothing, but you can override them to +run package-specific unit tests. For example, the +`py-py2cairo <https://github.com/spack/spack/blob/develop/var/spack/repos/builtin/packages/py-py2cairo/package.py>`_ +package uses: + +.. code-block:: python + + def installtest(self): + with working_dir('test'): + pytest = which('py.test') + pytest() + + +^^^^^^^^^^^^^^^ +Important files +^^^^^^^^^^^^^^^ + +Each Waf package comes with a custom ``waf`` build script, written in +Python. This script contains instructions to build the project. + +The package also comes with a ``wscript`` file. This file is used to +override the default ``configure``, ``build``, and ``install`` phases +to customize the Waf project. It also allows developers to override +the default ``./waf --help`` message. Check this file to find useful +information about dependencies and the minimum versions that are +supported. + +^^^^^^^^^^^^^^^^^^^^^^^^^ +Build system dependencies +^^^^^^^^^^^^^^^^^^^^^^^^^ + +``WafPackage`` does not require ``waf`` to build. ``waf`` is only +needed to create the ``./waf`` script. Since ``./waf`` is a Python +script, Python is needed to build the project. ``WafPackage`` adds +the following dependency automatically: + +.. code-block:: python + + depends_on('python@2.5:', type='build') + + +Waf only supports Python 2.5 and up. + +^^^^^^^^^^^^^^^^^^^^^^^^ +Passing arguments to waf +^^^^^^^^^^^^^^^^^^^^^^^^ + +As previously mentioned, each phase comes with a ``<phase_args>`` +function that can be used to pass arguments to that particular +phase. For example, if you need to pass arguments to the build +phase, you can use: + +.. code-block:: python + + def build_args(self, spec, prefix): + args = [] + + if self.run_tests: + args.append('--test') + + return args + + +A list of valid options can be found by running ``./waf --help``. + +^^^^^^^^^^^^^^^^^^^^^^ +External documentation +^^^^^^^^^^^^^^^^^^^^^^ + +For more information on the Waf build system, see: +https://waf.io/book/ diff --git a/lib/spack/docs/index.rst b/lib/spack/docs/index.rst index ea80e2c21e..16dc69de4d 100644 --- a/lib/spack/docs/index.rst +++ b/lib/spack/docs/index.rst @@ -73,6 +73,7 @@ or refer to the full manual below. contribution_guide packaging_guide + build_systems developer_guide docker_for_developers Spack API Docs <spack> |