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Document that reuse is higher priority than preferences in packages.yaml (#31864)

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Resurrect Known issues, since users ask frequently about that.
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Harmen Stoppels 2022-08-02 18:54:41 +02:00 committed by GitHub
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lib/spack/docs/index.rst
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@ -56,6 +56,7 @@ or refer to the full manual below.
basic_usage
Tutorial: Spack 101 <https://spack-tutorial.readthedocs.io>
replace_conda_homebrew
known_issues
.. toctree::
:maxdepth: 2

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lib/spack/docs/known_issues.rst Normal file
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.. Copyright 2013-2022 Lawrence Livermore National Security, LLC and other
Spack Project Developers. See the top-level COPYRIGHT file for details.
SPDX-License-Identifier: (Apache-2.0 OR MIT)
============
Known Issues
============
This is a list of known issues in Spack. It provides ways of getting around these
problems if you encounter them.
------------------------------------------------
Spack does not seem to respect ``packages.yaml``
------------------------------------------------
A common problem in Spack v0.18 and above is that package, compiler and target
preferences specified in ``packages.yaml`` do not seem to be respected. Spack picks the
"wrong" compilers and their versions, package versions and variants, and
micro-architectures.
This is however not a bug. In order to reduce the number of builds of the same
packages, the concretizer values reuse of installed packages higher than preferences
set in ``packages.yaml``. Note that ``packages.yaml`` specifies only preferences, not
hard constraints.
There are multiple workarounds:
1. Disable reuse during concretization: ``spack install --fresh <spec>`` when installing
from the command line, or ``spack concretize --fresh --force`` when using
environments.
2. Turn preferences into constrains, by moving them to the input spec. For example,
use ``spack spec zlib%gcc@12`` when you want to force GCC 12 even if ``zlib`` was
already installed with GCC 10.