diff options
Diffstat (limited to 'Help/policy/CMP0025.rst')
| -rw-r--r-- | Help/policy/CMP0025.rst | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/Help/policy/CMP0025.rst b/Help/policy/CMP0025.rst new file mode 100644 index 000000000..62dd50985 --- /dev/null +++ b/Help/policy/CMP0025.rst @@ -0,0 +1,29 @@ +CMP0025 +------- + +Compiler id for Apple Clang is now ``AppleClang``. + +CMake 3.0 and above recognize that Apple Clang is a different compiler +than upstream Clang and that they have different version numbers. +CMake now prefers to present this to projects by setting the +:variable:`CMAKE_<LANG>_COMPILER_ID` variable to ``AppleClang`` instead +of ``Clang``. However, existing projects may assume the compiler id for +Apple Clang is just ``Clang`` as it was in CMake versions prior to 3.0. +Therefore this policy determines for Apple Clang which compiler id to +report in the :variable:`CMAKE_<LANG>_COMPILER_ID` variable after +language ``<LANG>`` is enabled by the :command:`project` or +:command:`enable_language` command. The policy must be set prior +to the invocation of either command. + +The OLD behavior for this policy is to use compiler id ``Clang``. The +NEW behavior for this policy is to use compiler id ``AppleClang``. + +This policy was introduced in CMake version 3.0. Use the +:command:`cmake_policy` command to set this policy to OLD or NEW explicitly. +Unlike most policies, CMake version |release| does *not* warn +by default when this policy is not set and simply uses OLD behavior. +See documentation of the +:variable:`CMAKE_POLICY_WARNING_CMP0025 <CMAKE_POLICY_WARNING_CMP<NNNN>>` +variable to control the warning. + +.. include:: DEPRECATED.txt |