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Add cmake_reset_check_state() macro 

It's acknowledged that check state should not generally nest,
so it should be cleared when used, for example, in Find* module.

Also, add optional RESET argument to cmake_push_check_state().
This commit is contained in:
Vadim Zhukov 2013-07-28 14:11:51 +04:00 committed by Brad King
parent 8d3b65346f
commit 9349d69abf
1 changed files with 28 additions and 5 deletions
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33
Modules/CMakePushCheckState.cmake
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@ -1,8 +1,10 @@
# This module defines two macros:
# This module defines three 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
# and
# CMAKE_RESET_CHECK_STATE()
# These macros can be used to save, restore and reset (i.e., clear contents)
# 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.
@ -11,9 +13,16 @@
# but after the Find-module has been executed they should have the same value
# as they had before.
#
# CMAKE_PUSH_CHECK_STATE() macro receives optional argument RESET. Whether it's specified,
# CMAKE_PUSH_CHECK_STATE() will set all CMAKE_REQUIRED_* variables to empty values, same
# as CMAKE_RESET_CHECK_STATE() call will do.
#
# Usage:
# cmake_push_check_state()
# set(CMAKE_REQUIRED_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS} -DSOME_MORE_DEF)
# cmake_push_check_state(RESET)
# set(CMAKE_REQUIRED_DEFINITIONS -DSOME_MORE_DEF)
# check_function_exists(...)
# cmake_reset_check_state()
# set(CMAKE_REQUIRED_DEFINITIONS -DANOTHER_DEF)
# check_function_exists(...)
# cmake_pop_check_state()
@ -31,6 +40,15 @@
# License text for the above reference.)
macro(CMAKE_RESET_CHECK_STATE)
set(CMAKE_REQUIRED_INCLUDES)
set(CMAKE_REQUIRED_DEFINITIONS)
set(CMAKE_REQUIRED_LIBRARIES)
set(CMAKE_REQUIRED_FLAGS)
endmacro()
macro(CMAKE_PUSH_CHECK_STATE)
if(NOT DEFINED _CMAKE_PUSH_CHECK_STATE_COUNTER)
@ -43,6 +61,11 @@ macro(CMAKE_PUSH_CHECK_STATE)
set(_CMAKE_REQUIRED_DEFINITIONS_SAVE_${_CMAKE_PUSH_CHECK_STATE_COUNTER} ${CMAKE_REQUIRED_DEFINITIONS})
set(_CMAKE_REQUIRED_LIBRARIES_SAVE_${_CMAKE_PUSH_CHECK_STATE_COUNTER} ${CMAKE_REQUIRED_LIBRARIES})
set(_CMAKE_REQUIRED_FLAGS_SAVE_${_CMAKE_PUSH_CHECK_STATE_COUNTER} ${CMAKE_REQUIRED_FLAGS})
if (ARGC GREATER 0 AND ARGV0 STREQUAL "RESET")
cmake_reset_check_state()
endif()
endmacro()
macro(CMAKE_POP_CHECK_STATE)