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Add macros cmake_push/pop_check_state() as discussed on the list. 

This patch adds two macros cmake_push_check_state() and
cmake_pop_check_state(), which can be used to save and restore
the contents of the CMAKE_REQUIRED_xxx variables.

Alex
This commit is contained in:
Alex Neundorf 2011-07-07 22:07:16 +02:00
parent a8e0287d86
commit 1325260a66
3 changed files with 83 additions and 0 deletions
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52
Modules/CMakePushCheckState.cmake Normal file
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@ -0,0 +1,52 @@
# 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 ${CMAKE_REQUIRED_DEFINITIONS} -DSOME_MORE_DEF)
# check_function_exists(...)
# cmake_pop_check_state()
# Copyright (c) 2006-2011, Alexander Neundorf, <neundorf@kde.org>
#
# Redistribution and use is allowed according to the terms of the BSD license.
# For details see the accompanying COPYING-CMAKE-SCRIPTS file.
MACRO(CMAKE_PUSH_CHECK_STATE)
IF(NOT DEFINED _CMAKE_PUSH_CHECK_STATE_COUNTER)
SET(_CMAKE_PUSH_CHECK_STATE_COUNTER 0)
ENDIF()
MATH(EXPR _CMAKE_PUSH_CHECK_STATE_COUNTER "${_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)

1
Tests/CMakeTests/CMakeLists.txt
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@ -28,6 +28,7 @@ AddCMakeTest(Math "")
AddCMakeTest(CMakeMinimumRequired "")
AddCMakeTest(CompilerIdVendor "")
AddCMakeTest(ProcessorCount "")
AddCMakeTest(PushCheckState "")
AddCMakeTest(FileDownload "")
set_property(TEST CMake.FileDownload PROPERTY

30
Tests/CMakeTests/PushCheckStateTest.cmake.in Normal file
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@ -0,0 +1,30 @@
include(CMakePushCheckState)
set(CMAKE_REQUIRED_DEFINITIONS defs1 )
cmake_push_check_state()
set(CMAKE_REQUIRED_DEFINITIONS defs2)
cmake_push_check_state()
set(CMAKE_REQUIRED_DEFINITIONS defs3)
cmake_pop_check_state()
if (NOT "${CMAKE_REQUIRED_DEFINITIONS}" STREQUAL "defs2")
set(fatal TRUE)
message("ERROR: "CMAKE_REQUIRED_DEFINITIONS is \"${CMAKE_REQUIRED_DEFINITIONS}\" (expected \"defs2\")" )
endif()
cmake_pop_check_state()
if (NOT "${CMAKE_REQUIRED_DEFINITIONS}" STREQUAL "defs1")
set(fatal TRUE)
message("ERROR: "CMAKE_REQUIRED_DEFINITIONS is \"${CMAKE_REQUIRED_DEFINITIONS}\" (expected \"defs1\")" )
endif()
if(fatal)
message(FATAL_ERROR "cmake_push_check_state() test failed")
endif()