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MACRO(TRY_COMPILE_FROM_SOURCE SOURCE VAR)
IF("${VAR}" MATCHES "^${VAR}$" OR "${VAR}" MATCHES "UNKNOWN")
SET(MACRO_CHECK_FUNCTION_DEFINITIONS
"-D${VAR} ${CMAKE_REQUIRED_FLAGS}")
IF(CMAKE_REQUIRED_LIBRARIES)
SET(TRY_COMPILE_FROM_SOURCE_ADD_LIBRARIES
"-DLINK_LIBRARIES:STRING=${CMAKE_REQUIRED_LIBRARIES}")
ENDIF(CMAKE_REQUIRED_LIBRARIES)
SET(src "")
FOREACH(def ${EXTRA_DEFINES})
SET(src "${src}#define ${def} 1\n")
ENDFOREACH(def)
FOREACH(inc ${HEADER_INCLUDES})
SET(src "${src}#include <${inc}>\n")
ENDFOREACH(inc)
SET(src "${src}\nint main() { ${SOURCE} ; return 0; }")
FILE(WRITE "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/src2.c"
"${src}")
EXEC_PROGRAM("${CMAKE_COMMAND}"
"${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp"
ARGS -E copy src2.c src.c)
MESSAGE(STATUS "Performing Test ${VAR}")
TRY_COMPILE(${VAR}
${CMAKE_BINARY_DIR}
${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/src.c
CMAKE_FLAGS
"${TRY_COMPILE_FROM_SOURCE_ADD_LIBRARIES}"
OUTPUT_VARIABLE OUTPUT)
IF(${VAR})
SET(${VAR} 1 CACHE INTERNAL "Test ${FUNCTION}")
MESSAGE(STATUS "Performing Test ${VAR} - Success")
FILE(WRITE ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
"Performing C SOURCE FILE Test ${VAR} succeded with the following output:\n"
"${OUTPUT}\n"
"Source file was:\n${src}\n" APPEND)
ELSE(${VAR})
MESSAGE(STATUS "Performing Test ${VAR} - Failed")
SET(${VAR} "" CACHE INTERNAL "Test ${FUNCTION}")
FILE(WRITE ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
"Performing C SOURCE FILE Test ${VAR} failed with the following output:\n"
"${OUTPUT}\n"
"Source file was:\n${src}\n" APPEND)
ENDIF(${VAR})
ENDIF("${VAR}" MATCHES "^${VAR}$" OR "${VAR}" MATCHES "UNKNOWN")
ENDMACRO(TRY_COMPILE_FROM_SOURCE)
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