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diff --git a/Help/policy/CMP0138.rst b/Help/policy/CMP0138.rst new file mode 100644 index 0000000..5cf3948 --- /dev/null +++ b/Help/policy/CMP0138.rst @@ -0,0 +1,43 @@ +CMP0138 +------- + +.. versionadded:: 3.24 + +MSVC compilers use ``-ZI`` instead of ``/Zi`` for x86 and x64 by default. + +When using MSVC C/C++ compilers in CMake 3.23 and below, debug information +format flag ``/Zi`` is added to :variable:`CMAKE_<LANG>_FLAGS_DEBUG` and +:variable:`CMAKE_<LANG>_FLAGS_RELWITHDEBINFO` by default. The ``/Zi`` flag +produces a separate PDB file that contains all the symbolic debugging +information for use with the debugger, however, it does not support Edit +and Continue feature in a debugging session. + +CMake 3.24 and above adds ``-ZI`` to :variable:`CMAKE_<LANG>_FLAGS_DEBUG` +and :variable:`CMAKE_<LANG>_FLAGS_RELWITHDEBINFO` instead to enable Edit +and Continue 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_DEBUG` and +:variable:`CMAKE_<LANG>_FLAGS_RELWITHDEBINFO` for a given language +``<LANG>`` using MSVC compilers. + +.. 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 ``/Zi`` in the default +:variable:`CMAKE_<LANG>_FLAGS_DEBUG` and +:variable:`CMAKE_<LANG>_FLAGS_RELWITHDEBINFO` cache entries. The ``NEW`` +behavior for this policy is to place ``-ZI`` in the default cache entries. + +This policy was introduced in CMake version 3.24. Use the +:command:`cmake_policy` command to set it to ``OLD`` or ``NEW`` explicitly. +Unlike many policies, CMake version |release| does *not* warn +when this policy is not set and simply uses ``OLD`` behavior. + +.. include:: DEPRECATED.txt |