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104 lines
4.8 KiB
CMake
104 lines
4.8 KiB
CMake
# 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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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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#
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# * Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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#
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# * Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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#
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# * Neither the names of Kitware, Inc., the Insight Software Consortium,
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# nor the names of their contributors may be used to endorse or promote
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# products derived from this software without specific prior written
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# permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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# HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#
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# ------------------------------------------------------------------------------
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#
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# The above copyright and license notice applies to distributions of
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# CMake in source and binary form. Some source files contain additional
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# notices of original copyright by their contributors; see each source
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# for details. Third-party software packages supplied with CMake under
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# compatible licenses provide their own copyright notices documented in
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# corresponding subdirectories.
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#
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# ------------------------------------------------------------------------------
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#
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# CMake was initially developed by Kitware with the following sponsorship:
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#
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# * National Library of Medicine at the National Institutes of Health
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# as part of the Insight Segmentation and Registration Toolkit (ITK).
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#
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# * US National Labs (Los Alamos, Livermore, Sandia) ASC Parallel
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# Visualization Initiative.
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#
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# * National Alliance for Medical Image Computing (NAMIC) is funded by the
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# National Institutes of Health through the NIH Roadmap for Medical Research,
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# Grant U54 EB005149.
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#
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# * Kitware, Inc.
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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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