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36 lines
1.6 KiB
36 lines
1.6 KiB
CMP0119
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-------
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.. versionadded:: 3.20
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:prop_sf:`LANGUAGE` source file property explicitly compiles as specified
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language.
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The :prop_sf:`LANGUAGE` source file property is documented to mean that the
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source file is written in the specified language. In CMake 3.19 and below,
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setting this property causes CMake to compile the source file using the
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compiler for the specified language. However, it only passes an explicit
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flag to tell the compiler to treat the source as the specified language
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for MSVC-like, XL, and Embarcadero compilers for the ``CXX`` language.
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CMake 3.20 and above prefer to also explicitly tell the compiler to use
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the specified language using a flag such as ``-x c`` on all compilers
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for which such flags are known.
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This policy provides compatibility for projects that have not been updated
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to expect this behavior. For example, some projects were setting the
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``LANGUAGE`` property to ``C`` on assembly-language ``.S`` source files
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in order to compile them using the C compiler. Such projects should be
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updated to use ``enable_language(ASM)``, for which CMake will often choose
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the C compiler as the assembler on relevant platforms anyway.
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The ``OLD`` behavior for this policy is to interpret the ``LANGUAGE <LANG>``
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property using its undocumented meaning to "use the ``<LANG>`` compiler".
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The ``NEW`` behavior for this policy is to interpret the ``LANGUAGE <LANG>``
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property using its documented meaning to "compile as a ``<LANG>`` source".
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.. |INTRODUCED_IN_CMAKE_VERSION| replace:: 3.20
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.. |WARNS_OR_DOES_NOT_WARN| replace:: does *not* warn
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.. include:: STANDARD_ADVICE.txt
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.. include:: DEPRECATED.txt
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