| # 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 |
| # 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. |
| # |
| # 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() |
| |
| #============================================================================= |
| # Copyright 2006-2011 Alexander Neundorf, <neundorf@kde.org> |
| # |
| # Distributed under the OSI-approved BSD License (the "License"); |
| # see accompanying file Copyright.txt for details. |
| # |
| # This software is distributed WITHOUT ANY WARRANTY; without even the |
| # implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. |
| # See the License for more information. |
| #============================================================================= |
| # (To distribute this file outside of CMake, substitute the full |
| # 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) |
| set(_CMAKE_PUSH_CHECK_STATE_COUNTER 0) |
| endif() |
| |
| math(EXPR _CMAKE_PUSH_CHECK_STATE_COUNTER "${_CMAKE_PUSH_CHECK_STATE_COUNTER}+1") |
| |
| set(_CMAKE_REQUIRED_INCLUDES_SAVE_${_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} ${CMAKE_REQUIRED_FLAGS}) |
| |
| if (ARGC GREATER 0 AND ARGV0 STREQUAL "RESET") |
| cmake_reset_check_state() |
| endif() |
| |
| endmacro() |
| |
| macro(CMAKE_POP_CHECK_STATE) |
| |
| # don't pop more than we pushed |
| if("${_CMAKE_PUSH_CHECK_STATE_COUNTER}" GREATER "0") |
| |
| set(CMAKE_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}}) |
| |
| math(EXPR _CMAKE_PUSH_CHECK_STATE_COUNTER "${_CMAKE_PUSH_CHECK_STATE_COUNTER}-1") |
| endif() |
| |
| endmacro() |