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| author | Greg Becker <becker33@llnl.gov> | 2020-05-04 15:11:10 -0700 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2020-05-04 15:11:10 -0700 |
| commit | 8e2f5ba861bee449e7ad60f7da51767c23942c75 (patch) | |
| tree | 1a5ed9e027607e6ec6dc8ea33c687f578c976529 /lib/spack/docs/environments.rst | |
| parent | 6c07260d27a2556f4f559c0f0dc24217ef05a3ae (diff) | |
| download | spack-8e2f5ba861bee449e7ad60f7da51767c23942c75.tar.gz spack-8e2f5ba861bee449e7ad60f7da51767c23942c75.tar.bz2 spack-8e2f5ba861bee449e7ad60f7da51767c23942c75.tar.xz spack-8e2f5ba861bee449e7ad60f7da51767c23942c75.zip | |
environments: allow sigils to apply to entire reference (#15245)
* environments: allow sigils to apply to entire reference
Diffstat (limited to 'lib/spack/docs/environments.rst')
| -rw-r--r-- | lib/spack/docs/environments.rst | 36 |
1 files changed, 35 insertions, 1 deletions
diff --git a/lib/spack/docs/environments.rst b/lib/spack/docs/environments.rst index c26f81d914..b80e36b4b2 100644 --- a/lib/spack/docs/environments.rst +++ b/lib/spack/docs/environments.rst @@ -602,7 +602,7 @@ files are identical. spack: definitions: - first: [libelf, libdwarf] - - compilers: ['%gcc', '^intel'] + - compilers: ['%gcc', '%intel'] - second: - $first - matrix: @@ -676,6 +676,40 @@ The valid variables for a ``when`` clause are: #. ``hostname``. The hostname of the system (if ``hostname`` is an executable in the user's PATH). +"""""""""""""""""""""""" +SpecLists as Constraints +"""""""""""""""""""""""" + +Dependencies and compilers in Spack can be both packages in an +environment and constraints on other packages. References to SpecLists +allow a shorthand to treat packages in a list as either a compiler or +a dependency using the ``$%`` or ``$^`` syntax respectively. + +For example, the following environment has three root packages: +``gcc@8.1.0``, ``mvapich2@2.3.1 %gcc@8.1.0``, and ``hdf5+mpi +%gcc@8.1.0 ^mvapich2@2.3.1``. + +.. code-block:: yaml + + spack: + definitions: + - compilers: [gcc@8.1.0] + - mpis: [mvapich2@2.3.1] + - packages: [hdf5+mpi] + + specs: + - $compilers + - matrix: + - [$mpis] + - [$%compilers] + - matrix: + - [$packages] + - [$^mpis] + - [$%compilers] + +This allows for a much-needed reduction in redundancy between packages +and constraints. + ^^^^^^^^^^^^^^^^^^^^^^^^^ Environment-managed Views ^^^^^^^^^^^^^^^^^^^^^^^^^ |