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System with alternative compilers #1183

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16 changes: 16 additions & 0 deletions docs/add-a-system-config.rst
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Expand Up @@ -491,3 +491,19 @@ modules:

Therefore, the ``prefix`` is ``/usr/tce/packages/gcc/gcc-12.1.1/`` and the spec is
``[email protected]``.


1. Alternative compilers on the System
======================================

When some of the dependencies don't build with the default compiler, we use this syntax to provide an alternative compiler
while requiring that the main compiler is used where possible:

::

packages:
all:
require:
- one_of: ["%cce", "%gcc"] # this line makes Spack use cce to build where possible, gcc otherwise

This functionality depends on `Spack's one_of syntax <https://spack.readthedocs.io/en/latest/packages_yaml.html>`.
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