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Since commit 6baf65ec46 (ASM: Do not consider MSVC C/CXX compiler for
generic ASM, 2025-04-08) we no longer mistake `cl` for an assembler.
However, some projects unconditionally enable ``ASM``, which worked
on Windows only due to that bug. Restore compatibility with such
projects by guarding the change behind a new policy ``CMP0194``.
Fixes: #26907
Issue: #26617
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CMP0194
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.. versionadded:: 4.1
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MSVC is not an assembler for language ASM.
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When enabling the ``ASM`` language, CMake considers C compiler drivers
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as assembler candidates. CMake 4.0 and below accidentally selected
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MSVC's ``cl`` compiler as the ``CMAKE_ASM_COMPILER``, allowing the ``ASM``
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language to be enabled on Windows even though ``cl`` does not support
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assembler sources. CMake 4.1 and above prefer to reject ``cl`` as an
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assembler candidate, but some existing projects unconditionally enable
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``ASM`` on Windows even though they add no assembler sources. This
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policy provides compatibility for such projects to allow them to
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configure as before.
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The ``OLD`` behavior for this policy is to successfully enable ``ASM``
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even if ``cl`` is the only available candidate. The ``NEW`` behavior
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for this policy is to not consider ``cl`` as a candidate assembler
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for the ``ASM`` language.
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.. |INTRODUCED_IN_CMAKE_VERSION| replace:: 4.1
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.. |WARNS_OR_DOES_NOT_WARN| replace:: warns
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.. include:: include/STANDARD_ADVICE.rst
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.. include:: include/DEPRECATED.rst
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