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40 lines
1.6 KiB
40 lines
1.6 KiB
CMP0092
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-------
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.. versionadded:: 3.15
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MSVC warning flags are not in :variable:`CMAKE_<LANG>_FLAGS` by default.
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When using MSVC-like compilers in CMake 3.14 and below, warning flags
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like ``/W3`` are added to :variable:`CMAKE_<LANG>_FLAGS` by default.
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This is problematic for projects that want to choose a different warning
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level programmatically. In particular, it requires string editing of the
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:variable:`CMAKE_<LANG>_FLAGS` variables with knowledge of the
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CMake builtin defaults so they can be replaced.
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CMake 3.15 and above prefer to leave out warning flags from the value of
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:variable:`CMAKE_<LANG>_FLAGS` by default.
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This policy provides compatibility with projects that have not been updated
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to expect the lack of warning flags. The policy setting takes effect as of
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the first :command:`project` or :command:`enable_language` command that
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initializes :variable:`CMAKE_<LANG>_FLAGS` for a given language ``<LANG>``.
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.. note::
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Once the policy has taken effect at the top of a project for a given
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language, that choice must be used throughout the tree for that language.
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In projects that have nested projects in subdirectories, be sure to
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convert everything together.
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The ``OLD`` behavior for this policy is to place MSVC warning flags in the
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default :variable:`CMAKE_<LANG>_FLAGS` cache entries. The ``NEW`` behavior
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for this policy is to *not* place MSVC warning flags in the default cache
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entries.
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.. |INTRODUCED_IN_CMAKE_VERSION| replace:: 3.15
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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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