CMP0092

.. versionadded:: 3.15

MSVC warning flags are not in :variable:CMAKE_<LANG>_FLAGS by default.

When using MSVC-like compilers in CMake 3.14 and below, warning flags like /W3 are added to :variable:CMAKE_<LANG>_FLAGS by default. This is problematic for projects that want to choose a different warning level programmatically. In particular, it requires string editing of the :variable:CMAKE_<LANG>_FLAGS variables with knowledge of the CMake builtin defaults so they can be replaced.

CMake 3.15 and above prefer to leave out warning flags from the value of :variable:CMAKE_<LANG>_FLAGS by default.

This policy provides compatibility with projects that have not been updated to expect the lack of warning flags. The policy setting takes effect as of the first :command:project or :command:enable_language command that initializes :variable:CMAKE_<LANG>_FLAGS for a given language <LANG>.

.. note::

Once the policy has taken effect at the top of a project for a given language, that choice must be used throughout the tree for that language. In projects that have nested projects in subdirectories, be sure to convert everything together.

The OLD behavior for this policy is to place MSVC warning flags in the default :variable:CMAKE_<LANG>_FLAGS cache entries. The NEW behavior for this policy is to not place MSVC warning flags in the default cache entries.

.. |INTRODUCED_IN_CMAKE_VERSION| replace:: 3.15 .. |WARNS_OR_DOES_NOT_WARN| replace:: does not warn .. include:: include/STANDARD_ADVICE.rst

.. include:: include/DEPRECATED.rst