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# This module defines two macros:
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# CMAKE_PUSH_CHECK_STATE()
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# and
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# CMAKE_POP_CHECK_STATE()
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# These two macros can be used to save and restore the state of the variables
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# CMAKE_REQUIRED_FLAGS, CMAKE_REQUIRED_DEFINITIONS, CMAKE_REQUIRED_LIBRARIES
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# and CMAKE_REQUIRED_INCLUDES used by the various Check-files coming with CMake,
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# like e.g. check_function_exists() etc.
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# The variable contents are pushed on a stack, pushing multiple times is supported.
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# This is useful e.g. when executing such tests in a Find-module, where they have to be set,
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# but after the Find-module has been executed they should have the same value
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# as they had before.
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#
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# Usage:
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# cmake_push_check_state()
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# set(CMAKE_REQUIRED_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS} -DSOME_MORE_DEF)
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# check_function_exists(...)
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# cmake_pop_check_state()
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#=============================================================================
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# Copyright 2006-2011 Alexander Neundorf, <neundorf@kde.org>
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#
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# Distributed under the OSI-approved BSD License (the "License");
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# see accompanying file Copyright.txt for details.
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#
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# This software is distributed WITHOUT ANY WARRANTY; without even the
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# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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# See the License for more information.
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#=============================================================================
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# (To distribute this file outside of CMake, substitute the full
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# License text for the above reference.)
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macro(CMAKE_PUSH_CHECK_STATE)
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if(NOT DEFINED _CMAKE_PUSH_CHECK_STATE_COUNTER)
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set(_CMAKE_PUSH_CHECK_STATE_COUNTER 0)
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endif()
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math(EXPR _CMAKE_PUSH_CHECK_STATE_COUNTER "${_CMAKE_PUSH_CHECK_STATE_COUNTER}+1")
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set(_CMAKE_REQUIRED_INCLUDES_SAVE_${_CMAKE_PUSH_CHECK_STATE_COUNTER} ${CMAKE_REQUIRED_INCLUDES})
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set(_CMAKE_REQUIRED_DEFINITIONS_SAVE_${_CMAKE_PUSH_CHECK_STATE_COUNTER} ${CMAKE_REQUIRED_DEFINITIONS})
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set(_CMAKE_REQUIRED_LIBRARIES_SAVE_${_CMAKE_PUSH_CHECK_STATE_COUNTER} ${CMAKE_REQUIRED_LIBRARIES})
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set(_CMAKE_REQUIRED_FLAGS_SAVE_${_CMAKE_PUSH_CHECK_STATE_COUNTER} ${CMAKE_REQUIRED_FLAGS})
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endmacro()
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macro(CMAKE_POP_CHECK_STATE)
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# don't pop more than we pushed
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if("${_CMAKE_PUSH_CHECK_STATE_COUNTER}" GREATER "0")
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set(CMAKE_REQUIRED_INCLUDES ${_CMAKE_REQUIRED_INCLUDES_SAVE_${_CMAKE_PUSH_CHECK_STATE_COUNTER}})
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set(CMAKE_REQUIRED_DEFINITIONS ${_CMAKE_REQUIRED_DEFINITIONS_SAVE_${_CMAKE_PUSH_CHECK_STATE_COUNTER}})
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set(CMAKE_REQUIRED_LIBRARIES ${_CMAKE_REQUIRED_LIBRARIES_SAVE_${_CMAKE_PUSH_CHECK_STATE_COUNTER}})
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set(CMAKE_REQUIRED_FLAGS ${_CMAKE_REQUIRED_FLAGS_SAVE_${_CMAKE_PUSH_CHECK_STATE_COUNTER}})
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math(EXPR _CMAKE_PUSH_CHECK_STATE_COUNTER "${_CMAKE_PUSH_CHECK_STATE_COUNTER}-1")
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endif()
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endmacro()
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