26 lines
1.0 KiB
CMake
26 lines
1.0 KiB
CMake
#
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# Check if the variable exists.
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# # CHECK_VARIABLE_EXISTS - macro which checks if the variable exists
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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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MACRO(CHECK_VARIABLE_EXISTS VAR VARIABLE)
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IF("${VARIABLE}" MATCHES "^${VARIABLE}$")
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SET(MACRO_CHECK_VARIABLE_DEFINITIONS -DCHECK_VARIABLE_EXISTS=${VAR})
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TRY_COMPILE(${VARIABLE}
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${CMAKE_BINARY_DIR}
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${CMAKE_ROOT}/Modules/CheckVariableExists.c
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CMAKE_FLAGS -DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_VARIABLE_DEFINITIONS}
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OUTPUT_VARIABLE OUTPUT)
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IF(${VARIABLE})
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SET(${VARIABLE} 1 CACHE INTERNAL "Have variable ${VAR}")
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ELSE(${VARIABLE})
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SET(${VARIABLE} "" CACHE INTERNAL "Have variable ${VAR}")
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WRITE_FILE(${CMAKE_BINARY_DIR}/CMakeError.log
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"Determining if the variable ${VAR} exists failed with the following output:\n"
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"${OUTPUT}\n" APPEND)
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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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