CMake/CurlCheckCSourceCompiles.cmake

   1 # - Check if the source code provided in the SOURCE argument compiles.
   2 # CURL_CHECK_C_SOURCE_COMPILES(SOURCE VAR)
   3 # - macro which checks if the source code compiles
   4 #  SOURCE   - source code to try to compile
   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(CURL_CHECK_C_SOURCE_COMPILES SOURCE VAR)
  16   if("${VAR}" MATCHES "^${VAR}$" OR "${VAR}" MATCHES "UNKNOWN")
  17     set(message "${VAR}")
  18     # If the number of arguments is greater than 2 (SOURCE VAR)
  19     if(${ARGC} GREATER 2)
  20       # then add the third argument as a message
  21       set(message "${ARGV2} (${VAR})")
  22     endif(${ARGC} GREATER 2)
  23     set(MACRO_CHECK_FUNCTION_DEFINITIONS
  24       "-D${VAR} ${CMAKE_REQUIRED_FLAGS}")
  25     if(CMAKE_REQUIRED_LIBRARIES)
  26       set(CURL_CHECK_C_SOURCE_COMPILES_ADD_LIBRARIES
  27         "-DLINK_LIBRARIES:STRING=${CMAKE_REQUIRED_LIBRARIES}")
  28     else(CMAKE_REQUIRED_LIBRARIES)
  29       set(CURL_CHECK_C_SOURCE_COMPILES_ADD_LIBRARIES)
  30     endif(CMAKE_REQUIRED_LIBRARIES)
  31     if(CMAKE_REQUIRED_INCLUDES)
  32       set(CURL_CHECK_C_SOURCE_COMPILES_ADD_INCLUDES
  33         "-DINCLUDE_DIRECTORIES:STRING=${CMAKE_REQUIRED_INCLUDES}")
  34     else(CMAKE_REQUIRED_INCLUDES)
  35       set(CURL_CHECK_C_SOURCE_COMPILES_ADD_INCLUDES)
  36     endif(CMAKE_REQUIRED_INCLUDES)
  37     set(src "")
  38     foreach(def ${EXTRA_DEFINES})
  39       set(src "${src}#define ${def} 1\n")
  40     endforeach(def)
  41     foreach(inc ${HEADER_INCLUDES})
  42       set(src "${src}#include <${inc}>\n")
  43     endforeach(inc)
  44
  45     set(src "${src}\nint main() { ${SOURCE} ; return 0; }")
  46     set(CMAKE_CONFIGURABLE_FILE_CONTENT "${src}")
  47     configure_file(${CMAKE_CURRENT_SOURCE_DIR}/CMake/CMakeConfigurableFile.in
  48       "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/src.c"
  49       IMMEDIATE)
  50     message(STATUS "Performing Test ${message}")
  51     try_compile(${VAR}
  52       ${CMAKE_BINARY_DIR}
  53       ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/src.c
  54       COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS}
  55       CMAKE_FLAGS -DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_FUNCTION_DEFINITIONS}
  56       "${CURL_CHECK_C_SOURCE_COMPILES_ADD_LIBRARIES}"
  57       "${CURL_CHECK_C_SOURCE_COMPILES_ADD_INCLUDES}"
  58       OUTPUT_VARIABLE OUTPUT)
  59     if(${VAR})
  60       set(${VAR} 1 CACHE INTERNAL "Test ${message}")
  61       message(STATUS "Performing Test ${message} - Success")
  62       file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
  63         "Performing C SOURCE FILE Test ${message} succeded with the following output:\n"
  64         "${OUTPUT}\n"
  65         "Source file was:\n${src}\n")
  66     else(${VAR})
  67       message(STATUS "Performing Test ${message} - Failed")
  68       set(${VAR} "" CACHE INTERNAL "Test ${message}")
  69       file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
  70         "Performing C SOURCE FILE Test ${message} failed with the following output:\n"
  71         "${OUTPUT}\n"
  72         "Source file was:\n${src}\n")
  73     endif(${VAR})
  74   endif("${VAR}" MATCHES "^${VAR}$" OR "${VAR}" MATCHES "UNKNOWN")
  75 endmacro(CURL_CHECK_C_SOURCE_COMPILES)