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Diffstat (limited to 'lib/spack/docs/packaging_guide.rst')
| -rw-r--r-- | lib/spack/docs/packaging_guide.rst | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/lib/spack/docs/packaging_guide.rst b/lib/spack/docs/packaging_guide.rst index 1a64c7db4a..18541179b2 100644 --- a/lib/spack/docs/packaging_guide.rst +++ b/lib/spack/docs/packaging_guide.rst @@ -1560,6 +1560,28 @@ Python's ``setup_dependent_environment`` method also sets up some other variables, creates a directory, and sets up the ``PYTHONPATH`` so that dependent packages can find their dependencies at build time. +.. _packaging_conflicts: + +--------- +Conflicts +--------- + +Sometimes packages have known bugs, or limitations, that would prevent them +to build e.g. against other dependencies or with certain compilers. Spack +makes it possible to express such constraints with the ``conflicts`` directive. + +Adding the following to a package: + +.. code-block:: python + + conflicts('%intel', when='@1.2') + +we express the fact that the current package *cannot be built* with the Intel +compiler when we are trying to install version "1.2". The ``when`` argument can +be omitted, in which case the conflict will always be active. +Conflicts are always evaluated after the concretization step has been performed, +and if any match is found a detailed error message is shown to the user. + .. _packaging_extensions: ---------- |