CMP0025ΒΆ
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
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 CMAKE_<LANG>_COMPILER_ID
variable after
language <LANG>
is enabled by the project()
or
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
cmake_policy()
command to set this policy to OLD or NEW explicitly.
Unlike most policies, CMake version 3.0.2 does not warn
by default when this policy is not set and simply uses OLD behavior.
See documentation of the
CMAKE_POLICY_WARNING_CMP0025
variable to control the warning.