87 lines
3.4 KiB
CMake
87 lines
3.4 KiB
CMake
# Distributed under the OSI-approved BSD 3-Clause License. See accompanying
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# file Copyright.txt or https://cmake.org/licensing for details.
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#.rst:
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# CMakePushCheckState
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# -------------------
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#
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#
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#
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# This module defines three macros: CMAKE_PUSH_CHECK_STATE()
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# CMAKE_POP_CHECK_STATE() and CMAKE_RESET_CHECK_STATE() These macros can
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# be used to save, restore and reset (i.e., clear contents) the state of
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# the variables CMAKE_REQUIRED_FLAGS, CMAKE_REQUIRED_DEFINITIONS,
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# CMAKE_REQUIRED_LIBRARIES, CMAKE_REQUIRED_INCLUDES and CMAKE_EXTRA_INCLUDE_FILES
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# used by the various Check-files coming with CMake, like e.g.
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# check_function_exists() etc. The variable contents are pushed on a
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# stack, pushing multiple times is supported. This is useful e.g. when
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# executing such tests in a Find-module, where they have to be set, but
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# after the Find-module has been executed they should have the same
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# value as they had before.
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#
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# CMAKE_PUSH_CHECK_STATE() macro receives optional argument RESET.
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# Whether it's specified, CMAKE_PUSH_CHECK_STATE() will set all
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# CMAKE_REQUIRED_* variables to empty values, same as
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# CMAKE_RESET_CHECK_STATE() call will do.
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#
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# Usage:
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#
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# ::
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#
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# cmake_push_check_state(RESET)
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# set(CMAKE_REQUIRED_DEFINITIONS -DSOME_MORE_DEF)
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# check_function_exists(...)
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# cmake_reset_check_state()
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# set(CMAKE_REQUIRED_DEFINITIONS -DANOTHER_DEF)
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# check_function_exists(...)
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# cmake_pop_check_state()
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macro(CMAKE_RESET_CHECK_STATE)
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set(CMAKE_EXTRA_INCLUDE_FILES)
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set(CMAKE_REQUIRED_INCLUDES)
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set(CMAKE_REQUIRED_DEFINITIONS)
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set(CMAKE_REQUIRED_LIBRARIES)
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set(CMAKE_REQUIRED_FLAGS)
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set(CMAKE_REQUIRED_QUIET)
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endmacro()
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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 "${_CMAKE_PUSH_CHECK_STATE_COUNTER}+1")
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set(_CMAKE_EXTRA_INCLUDE_FILES_SAVE_${_CMAKE_PUSH_CHECK_STATE_COUNTER} ${CMAKE_EXTRA_INCLUDE_FILES})
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set(_CMAKE_REQUIRED_INCLUDES_SAVE_${_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} ${CMAKE_REQUIRED_FLAGS})
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set(_CMAKE_REQUIRED_QUIET_SAVE_${_CMAKE_PUSH_CHECK_STATE_COUNTER} ${CMAKE_REQUIRED_QUIET})
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if (ARGC GREATER 0 AND ARGV0 STREQUAL "RESET")
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cmake_reset_check_state()
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endif()
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endmacro()
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macro(CMAKE_POP_CHECK_STATE)
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# don't pop more than we pushed
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if("${_CMAKE_PUSH_CHECK_STATE_COUNTER}" GREATER "0")
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set(CMAKE_EXTRA_INCLUDE_FILES ${_CMAKE_EXTRA_INCLUDE_FILES_SAVE_${_CMAKE_PUSH_CHECK_STATE_COUNTER}})
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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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set(CMAKE_REQUIRED_QUIET ${_CMAKE_REQUIRED_QUIET_SAVE_${_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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