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1 # - Check if the C source code provided in the SOURCE argument compiles.
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2 # CHECK_C_SOURCE_COMPILES(SOURCE VAR)
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3 #
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4 # FLAG - compiler flag to check
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5 # VAR - variable to store whether the source code compiled
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6 #
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7 # The following variables may be set before calling this macro to
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8 # modify the way the check is run:
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9 #
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10 # CMAKE_REQUIRED_FLAGS = string of compile command line flags
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11 # CMAKE_REQUIRED_DEFINITIONS = list of macros to define (-DFOO=bar)
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12 # CMAKE_REQUIRED_INCLUDES = list of include directories
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13 # CMAKE_REQUIRED_LIBRARIES = list of libraries to link
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14
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15 MACRO(CHECK_C_COMPILER_FLAG FLAG VAR)
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16 IF("${VAR}" MATCHES "^${VAR}$")
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17 SET(MACRO_CHECK_FUNCTION_DEFINITIONS
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18 "${FLAG} ${CMAKE_REQUIRED_FLAGS}")
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19 IF(CMAKE_REQUIRED_LIBRARIES)
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20 SET(CHECK_C_COMPILER_FLAG_ADD_LIBRARIES
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21 "-DLINK_LIBRARIES:STRING=${CMAKE_REQUIRED_LIBRARIES}")
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22 ELSE(CMAKE_REQUIRED_LIBRARIES)
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23 SET(CHECK_C_COMPILER_FLAG_ADD_LIBRARIES)
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24 ENDIF(CMAKE_REQUIRED_LIBRARIES)
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25 IF(CMAKE_REQUIRED_INCLUDES)
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26 SET(CHECK_C_COMPILER_FLAG_ADD_INCLUDES
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27 "-DINCLUDE_DIRECTORIES:STRING=${CMAKE_REQUIRED_INCLUDES}")
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28 ELSE(CMAKE_REQUIRED_INCLUDES)
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29 SET(CHECK_C_COMPILER_FLAG_ADD_INCLUDES)
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30 ENDIF(CMAKE_REQUIRED_INCLUDES)
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31 FILE(WRITE "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/src.c"
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32 "int main() {return 0;}\n")
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33
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34 MESSAGE(STATUS "Checking if C compiler supports ${FLAG}")
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35 TRY_COMPILE(${VAR}
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36 ${CMAKE_BINARY_DIR}
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37 ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/src.c
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38 COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS}
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39 CMAKE_FLAGS -DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_FUNCTION_DEFINITIONS}
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40 "${CHECK_C_COMPILER_FLAG_ADD_LIBRARIES}"
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41 "${CHECK_C_COMPILER_FLAG_ADD_INCLUDES}"
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42 OUTPUT_VARIABLE OUTPUT)
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43 IF(${VAR})
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44 SET(${VAR} 1 CACHE INTERNAL "Test ${VAR}")
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45 MESSAGE(STATUS "Checking if C compiler supports ${FLAG} - Success")
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46 FILE(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
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47 "Performing C SOURCE FILE Test ${VAR} succeded with the following output:\n"
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48 "${OUTPUT}\n"
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49 "Source file was:\n${SOURCE}\n")
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50 ELSE(${VAR})
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51 MESSAGE(STATUS "Checking if C compiler supports ${FLAG} - Failed")
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52 SET(${VAR} "" CACHE INTERNAL "Test ${VAR}")
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53 FILE(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
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54 "Performing C SOURCE FILE Test ${VAR} failed with the following output:\n"
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55 "${OUTPUT}\n"
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56 "Source file was:\n${SOURCE}\n")
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57 ENDIF(${VAR})
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58 ENDIF("${VAR}" MATCHES "^${VAR}$")
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59 ENDMACRO(CHECK_C_COMPILER_FLAG)
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