New in version 3.24.
CheckIPOSupported uses flags from calling project.
command compiles a test project to determine whether the toolchain
INTERPROCEDURAL_OPTIMIZATION. CMake 3.23 and
below run the check with the default values of the
variables for the current environment and toolchain settings.
However, some projects may modify these flag variables to add
flags that affect availability of the toolchain's IPO features.
CMake 3.24 and above prefer to honor the calling project's values
for these variables. This policy provides compatibility for projects
that have not been updated to expect this behavior.
OLD behavior for this policy is to ignore the calling
project's values of
for this policy is to use the values of those variables as
compiler flags in the test project.
This policy was introduced in CMake version 3.24. Use the
cmake_policy() command to set it to
Unlike many policies, CMake version 3.28.20231129-g348cdb5 does not warn
when this policy is not set and simply uses
OLD behavior of a policy is
deprecated by definition
and may be removed in a future version of CMake.