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# 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()
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