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enable_language(): Fail if called before project()

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Fixes: #25550
This commit is contained in:
Craig Scott
2024-03-30 14:48:50 +11:00
parent d166e7d740
commit 97464aa970
15 changed files with 101 additions and 8 deletions
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Help/command/enable_language.rst
+10 -6
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@@ -9,15 +9,19 @@ Enable languages (CXX/C/OBJC/OBJCXX/Fortran/etc)
Enables support for the named languages in CMake. This is the same as
the :command:`project` command but does not create any of the extra
variables that are created by the project command.
variables that are created by the :command:`project` command.
.. include:: SUPPORTED_LANGUAGES.txt
This command must be called in file scope, not in a function call.
Furthermore, it must be called in the highest directory common to all
targets using the named language directly for compiling sources or
indirectly through link dependencies. It is simplest to enable all
needed languages in the top-level directory of a project.
The following restrictions apply to where ``enable_language()`` may be called:
* It must be called in file scope, not in a function call.
* It must not be called before the first call to :command:`project`.
See policy :policy:`CMP0165`.
* It must be called in the highest directory common to all targets
using the named language directly for compiling sources or
indirectly through link dependencies. It is simplest to enable all
needed languages in the top-level directory of a project.
The ``OPTIONAL`` keyword is a placeholder for future implementation and
does not currently work. Instead you can use the :module:`CheckLanguage`