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# - Check if the source code provided in the SOURCE argument compiles.
# CHECK_CXX_SOURCE_COMPILES(SOURCE VAR)
# - macro which checks if the source code compiles\
# SOURCE - source code to try to compile
# VAR - variable to store size if the type exists.
# Checks the following optional VARIABLES (not arguments)
# CMAKE_REQUIRED_LIBRARIES - Link to extra libraries
# CMAKE_REQUIRED_FLAGS - Extra flags to C compiler
#
MACRO(CHECK_CXX_SOURCE_COMPILES SOURCE VAR)
IF("${VAR}" MATCHES "^${VAR}$")
SET(MACRO_CHECK_FUNCTION_DEFINITIONS
"-D${VAR} ${CMAKE_REQUIRED_FLAGS}")
IF(CMAKE_REQUIRED_LIBRARIES)
SET(CHECK_CXX_SOURCE_COMPILES_ADD_LIBRARIES
"-DLINK_LIBRARIES:STRING=${CMAKE_REQUIRED_LIBRARIES}")
ENDIF(CMAKE_REQUIRED_LIBRARIES)
IF(CMAKE_REQUIRED_INCLUDES)
SET(CHECK_CXX_SOURCE_COMPILES_ADD_INCLUDES
"-DINCLUDE_DIRECTORIES:STRING=${CMAKE_REQUIRED_INCLUDES}")
ENDIF(CMAKE_REQUIRED_INCLUDES)
FILE(WRITE "${CMAKE_BINARY_DIR}/CMakeTmp/src.c"
"${SOURCE}")
MESSAGE(STATUS "Performing Test ${VAR}")
TRY_COMPILE(${VAR}
${CMAKE_BINARY_DIR}
${CMAKE_BINARY_DIR}/CMakeTmp/src.cxx
CMAKE_FLAGS
"${CHECK_CXX_SOURCE_COMPILES_ADD_LIBRARIES}"
"${CHECK_CXX_SOURCE_COMPILES_ADD_INCLUDES}"
OUTPUT_VARIABLE OUTPUT)
IF(${VAR})
SET(${VAR} 1 CACHE INTERNAL "Test ${FUNCTION}")
MESSAGE(STATUS "Performing Test ${VAR} - Success")
WRITE_FILE(${CMAKE_BINARY_DIR}/CMakeOutput.log
"Performing C++ SOURCE FILE Test ${VAR} succeded with the following output:\n"
"${OUTPUT}\n"
"Source file was:\n${SOURCE}\n" APPEND)
ELSE(${VAR})
MESSAGE(STATUS "Performing Test ${VAR} - Failed")
SET(${VAR} "" CACHE INTERNAL "Test ${FUNCTION}")
WRITE_FILE(${CMAKE_BINARY_DIR}/CMakeError.log
"Performing C++ SOURCE FILE Test ${VAR} failed with the following output:\n"
"${OUTPUT}\n"
"Source file was:\n${SOURCE}\n" APPEND)
ENDIF(${VAR})
ENDIF("${VAR}" MATCHES "^${VAR}$")
ENDMACRO(CHECK_CXX_SOURCE_COMPILES)
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