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Diffstat (limited to 'Modules/CMakePushCheckState.cmake')
| -rw-r--r-- | Modules/CMakePushCheckState.cmake | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/Modules/CMakePushCheckState.cmake b/Modules/CMakePushCheckState.cmake new file mode 100644 index 000000000..0a4212818 --- /dev/null +++ b/Modules/CMakePushCheckState.cmake @@ -0,0 +1,61 @@ +# This module defines two macros: +# CMAKE_PUSH_CHECK_STATE() +# and +# CMAKE_POP_CHECK_STATE() +# These two macros can be used to save and restore 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. +# +# Usage: +# cmake_push_check_state() +# set(CMAKE_REQUIRED_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS} -DSOME_MORE_DEF) +# check_function_exists(...) +# cmake_pop_check_state() + +#============================================================================= +# Copyright 2006-2011 Alexander Neundorf, <neundorf@kde.org> +# +# Distributed under the OSI-approved BSD License (the "License"); +# see accompanying file Copyright.txt for details. +# +# This software is distributed WITHOUT ANY WARRANTY; without even the +# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. +# See the License for more information. +#============================================================================= +# (To distribute this file outside of CMake, substitute the full +# License text for the above reference.) + + +MACRO(CMAKE_PUSH_CHECK_STATE) + + IF(NOT DEFINED _CMAKE_PUSH_CHECK_STATE_COUNTER) + SET(_CMAKE_PUSH_CHECK_STATE_COUNTER 0) + ENDIF() + + MATH(EXPR _CMAKE_PUSH_CHECK_STATE_COUNTER "${_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} ${CMAKE_REQUIRED_FLAGS}) +ENDMACRO(CMAKE_PUSH_CHECK_STATE) + +MACRO(CMAKE_POP_CHECK_STATE) + +# don't pop more than we pushed + IF("${_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(CMAKE_POP_CHECK_STATE) |