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# - Check if the variable exists.
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# CHECK_VARIABLE_EXISTS(VAR VARIABLE)
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#
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# VAR - the name of the variable
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# VARIABLE - variable to store the result
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#
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# This macro is only for C variables.
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#
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# The following variables may be set before calling this macro to
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# modify the way the check is run:
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#
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# CMAKE_REQUIRED_FLAGS = string of compile command line flags
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# CMAKE_REQUIRED_DEFINITIONS = list of macros to define (-DFOO=bar)
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# CMAKE_REQUIRED_LIBRARIES = list of libraries to link
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#=============================================================================
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# Copyright 2002-2009 Kitware, Inc.
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#
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# Distributed under the OSI-approved BSD License (the "License");
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# see accompanying file Copyright.txt for details.
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#
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# This software is distributed WITHOUT ANY WARRANTY; without even the
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# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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# See the License for more information.
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#=============================================================================
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# (To distribute this file outside of CMake, substitute the full
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# License text for the above reference.)
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MACRO(CHECK_VARIABLE_EXISTS VAR VARIABLE)
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IF("${VARIABLE}" MATCHES "^${VARIABLE}$")
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SET(MACRO_CHECK_VARIABLE_DEFINITIONS
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"-DCHECK_VARIABLE_EXISTS=${VAR} ${CMAKE_REQUIRED_FLAGS}")
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MESSAGE(STATUS "Looking for ${VAR}")
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IF(CMAKE_REQUIRED_LIBRARIES)
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SET(CHECK_VARIABLE_EXISTS_ADD_LIBRARIES
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"-DLINK_LIBRARIES:STRING=${CMAKE_REQUIRED_LIBRARIES}")
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ELSE(CMAKE_REQUIRED_LIBRARIES)
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SET(CHECK_VARIABLE_EXISTS_ADD_LIBRARIES)
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ENDIF(CMAKE_REQUIRED_LIBRARIES)
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TRY_COMPILE(${VARIABLE}
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${CMAKE_BINARY_DIR}
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${CMAKE_ROOT}/Modules/CheckVariableExists.c
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COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS}
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CMAKE_FLAGS -DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_VARIABLE_DEFINITIONS}
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"${CHECK_VARIABLE_EXISTS_ADD_LIBRARIES}"
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OUTPUT_VARIABLE OUTPUT)
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IF(${VARIABLE})
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SET(${VARIABLE} 1 CACHE INTERNAL "Have variable ${VAR}")
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MESSAGE(STATUS "Looking for ${VAR} - found")
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FILE(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
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"Determining if the variable ${VAR} exists passed with the following output:\n"
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"${OUTPUT}\n\n")
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ELSE(${VARIABLE})
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SET(${VARIABLE} "" CACHE INTERNAL "Have variable ${VAR}")
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MESSAGE(STATUS "Looking for ${VAR} - not found")
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FILE(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
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"Determining if the variable ${VAR} exists failed with the following output:\n"
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"${OUTPUT}\n\n")
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ENDIF(${VARIABLE})
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ENDIF("${VARIABLE}" MATCHES "^${VARIABLE}$")
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ENDMACRO(CHECK_VARIABLE_EXISTS)
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