CMakePushCheckState
: This module defines two macros: CMAKE_PUSH_CHECK_STATE() and CMAKE_POP_CHECK_STATE() These two macros can be used to save and restore the state of the variables CMAKE_REQUIRED_FLAGS, CMAKE_REQUIRED_DEFINITIONS, CMAKE_REQUIRED_LIBRARIES and CMAKE_REQUIRED_INCLUDES used by the various Check-files coming with CMake, like e.g. check_function_exists() etc. The variable contents are pushed on a stack, pushing multiple times is supported. This is useful e.g. when executing such tests in a Find-module, where they have to be set, but after the Find-module has been executed they should have the same value as they had before.
Usage:
cmake_push_check_state()
set(CMAKE_REQUIRED_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS} -DSOME_MORE_DEF)
check_function_exists(...)
cmake_pop_check_state()