| # Distributed under the OSI-approved BSD 3-Clause License. See accompanying |
| # file Copyright.txt or https://cmake.org/licensing for details. |
| |
| #[=======================================================================[.rst: |
| CMakePushCheckState |
| ------------------- |
| |
| |
| |
| This module defines three macros: CMAKE_PUSH_CHECK_STATE() |
| CMAKE_POP_CHECK_STATE() 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, CMAKE_REQUIRED_INCLUDES and CMAKE_EXTRA_INCLUDE_FILES |
| 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. |
| |
| 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(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() |
| #]=======================================================================] |
| |
| macro(CMAKE_RESET_CHECK_STATE) |
| |
| set(CMAKE_EXTRA_INCLUDE_FILES) |
| set(CMAKE_REQUIRED_INCLUDES) |
| set(CMAKE_REQUIRED_DEFINITIONS) |
| set(CMAKE_REQUIRED_LIBRARIES) |
| set(CMAKE_REQUIRED_FLAGS) |
| set(CMAKE_REQUIRED_QUIET) |
| |
| endmacro() |
| |
| macro(CMAKE_PUSH_CHECK_STATE) |
| |
| if(NOT DEFINED _CMAKE_PUSH_CHECK_STATE_COUNTER) |
| set(_CMAKE_PUSH_CHECK_STATE_COUNTER 0) |
| endif() |
| |
| math(EXPR _CMAKE_PUSH_CHECK_STATE_COUNTER "${_CMAKE_PUSH_CHECK_STATE_COUNTER}+1") |
| |
| set(_CMAKE_EXTRA_INCLUDE_FILES_SAVE_${_CMAKE_PUSH_CHECK_STATE_COUNTER} ${CMAKE_EXTRA_INCLUDE_FILES}) |
| set(_CMAKE_REQUIRED_INCLUDES_SAVE_${_CMAKE_PUSH_CHECK_STATE_COUNTER} ${CMAKE_REQUIRED_INCLUDES}) |
| set(_CMAKE_REQUIRED_DEFINITIONS_SAVE_${_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} ${CMAKE_REQUIRED_FLAGS}) |
| set(_CMAKE_REQUIRED_QUIET_SAVE_${_CMAKE_PUSH_CHECK_STATE_COUNTER} ${CMAKE_REQUIRED_QUIET}) |
| |
| if (${ARGC} GREATER 0 AND "${ARGV0}" STREQUAL "RESET") |
| cmake_reset_check_state() |
| endif() |
| |
| endmacro() |
| |
| macro(CMAKE_POP_CHECK_STATE) |
| |
| # don't pop more than we pushed |
| if("${_CMAKE_PUSH_CHECK_STATE_COUNTER}" GREATER "0") |
| |
| set(CMAKE_EXTRA_INCLUDE_FILES ${_CMAKE_EXTRA_INCLUDE_FILES_SAVE_${_CMAKE_PUSH_CHECK_STATE_COUNTER}}) |
| set(CMAKE_REQUIRED_INCLUDES ${_CMAKE_REQUIRED_INCLUDES_SAVE_${_CMAKE_PUSH_CHECK_STATE_COUNTER}}) |
| set(CMAKE_REQUIRED_DEFINITIONS ${_CMAKE_REQUIRED_DEFINITIONS_SAVE_${_CMAKE_PUSH_CHECK_STATE_COUNTER}}) |
| set(CMAKE_REQUIRED_LIBRARIES ${_CMAKE_REQUIRED_LIBRARIES_SAVE_${_CMAKE_PUSH_CHECK_STATE_COUNTER}}) |
| set(CMAKE_REQUIRED_FLAGS ${_CMAKE_REQUIRED_FLAGS_SAVE_${_CMAKE_PUSH_CHECK_STATE_COUNTER}}) |
| set(CMAKE_REQUIRED_QUIET ${_CMAKE_REQUIRED_QUIET_SAVE_${_CMAKE_PUSH_CHECK_STATE_COUNTER}}) |
| |
| math(EXPR _CMAKE_PUSH_CHECK_STATE_COUNTER "${_CMAKE_PUSH_CHECK_STATE_COUNTER}-1") |
| endif() |
| |
| endmacro() |