Mercurial > audio-send

     1 # - Check if the C source code provided in the SOURCE argument compiles.

     2 # CHECK_C_SOURCE_COMPILES(SOURCE VAR)

     3 #

     4 #  FLAG   - compiler flag to check

     5 #  VAR    - variable to store whether the source code compiled

     6 #

     7 # The following variables may be set before calling this macro to

     8 # modify the way the check is run:

     9 #

    10 #  CMAKE_REQUIRED_FLAGS = string of compile command line flags

    11 #  CMAKE_REQUIRED_DEFINITIONS = list of macros to define (-DFOO=bar)

    12 #  CMAKE_REQUIRED_INCLUDES = list of include directories

    13 #  CMAKE_REQUIRED_LIBRARIES = list of libraries to link

    14 

    15 MACRO(CHECK_C_COMPILER_FLAG FLAG VAR)

    16   IF("${VAR}" MATCHES "^${VAR}$")

    17     SET(MACRO_CHECK_FUNCTION_DEFINITIONS

    18       "${FLAG} ${CMAKE_REQUIRED_FLAGS}")

    19     IF(CMAKE_REQUIRED_LIBRARIES)

    20       SET(CHECK_C_COMPILER_FLAG_ADD_LIBRARIES

    21         "-DLINK_LIBRARIES:STRING=${CMAKE_REQUIRED_LIBRARIES}")

    22     ELSE(CMAKE_REQUIRED_LIBRARIES)

    23       SET(CHECK_C_COMPILER_FLAG_ADD_LIBRARIES)

    24     ENDIF(CMAKE_REQUIRED_LIBRARIES)

    25     IF(CMAKE_REQUIRED_INCLUDES)

    26       SET(CHECK_C_COMPILER_FLAG_ADD_INCLUDES

    27         "-DINCLUDE_DIRECTORIES:STRING=${CMAKE_REQUIRED_INCLUDES}")

    28     ELSE(CMAKE_REQUIRED_INCLUDES)

    29       SET(CHECK_C_COMPILER_FLAG_ADD_INCLUDES)

    30     ENDIF(CMAKE_REQUIRED_INCLUDES)

    31     FILE(WRITE "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/src.c"

    32       "int main() {return 0;}\n")

    33 

    34     MESSAGE(STATUS "Checking if C compiler supports ${FLAG}")

    35     TRY_COMPILE(${VAR}

    36       ${CMAKE_BINARY_DIR}

    37       ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/src.c

    38       COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS}

    39       CMAKE_FLAGS -DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_FUNCTION_DEFINITIONS}

    40       "${CHECK_C_COMPILER_FLAG_ADD_LIBRARIES}"

    41       "${CHECK_C_COMPILER_FLAG_ADD_INCLUDES}"

    42       OUTPUT_VARIABLE OUTPUT)

    43     IF(${VAR})

    44       SET(${VAR} 1 CACHE INTERNAL "Test ${VAR}")

    45       MESSAGE(STATUS "Checking if C compiler supports ${FLAG} - Success")

    46       FILE(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log

    47         "Performing C SOURCE FILE Test ${VAR} succeded with the following output:\n"

    48         "${OUTPUT}\n"

    49         "Source file was:\n${SOURCE}\n")

    50     ELSE(${VAR})

    51       MESSAGE(STATUS "Checking if C compiler supports ${FLAG} - Failed")

    52       SET(${VAR} "" CACHE INTERNAL "Test ${VAR}")

    53       FILE(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log

    54         "Performing C SOURCE FILE Test ${VAR} failed with the following output:\n"

    55         "${OUTPUT}\n"

    56         "Source file was:\n${SOURCE}\n")

    57     ENDIF(${VAR})

    58   ENDIF("${VAR}" MATCHES "^${VAR}$")

    59 ENDMACRO(CHECK_C_COMPILER_FLAG)
author	Robert McIntyre <rlm@mit.edu>
date	Tue, 25 Oct 2011 13:02:31 -0700
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