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Help: Discourage use of Swift_MODULE_DIRECTORY with multi-config generators

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It does not yet support per-config module directories.

Issue: #25989
Issue: #26010
This commit is contained in:
Dave Abrahams
2024-05-23 13:33:25 -04:00
committed by Brad King
parent 71c52c76fa
commit 61e76200d7
1 changed files with 12 additions and 0 deletions
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Help/prop_tgt/Swift_MODULE_DIRECTORY.rst
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@@ -10,3 +10,15 @@ the modules will be placed. When this property is not set, the modules will be
placed in the build directory corresponding to the target's source directory. placed in the build directory corresponding to the target's source directory.
If the variable :variable:`CMAKE_Swift_MODULE_DIRECTORY` is set when a target is If the variable :variable:`CMAKE_Swift_MODULE_DIRECTORY` is set when a target is
created its value is used to initialize this property. created its value is used to initialize this property.
.. warning::
This property does not currently provide a way to express per-config
module directories, so use with multi-config generators is problematic:
* The :generator:`Xcode` generator does not implement the property at all.
* The :generator:`Ninja Multi-Config` generator implements this property,
but module files generated for different build configurations have the
same path, which can lead to subtle problems when building more than
one configuration.