Modules/CMakeDetermineCompilerId.cmake

   1
   2 # Function to compile a source file to identify the compiler.  This is
   3 # used internally by CMake and should not be included by user code.
   4 # If successful, sets CMAKE_<lang>_COMPILER_ID and CMAKE_<lang>_PLATFORM_ID
   5
   6 FUNCTION(CMAKE_DETERMINE_COMPILER_ID lang flagvar src)
   7   # Make sure the compiler arguments are clean.
   8   STRING(STRIP "${CMAKE_${lang}_COMPILER_ARG1}" CMAKE_${lang}_COMPILER_ID_ARG1)
   9
  10   # Make sure user-specified compiler flags are used.
  11   IF(CMAKE_${lang}_FLAGS)
  12     SET(CMAKE_${lang}_COMPILER_ID_FLAGS ${CMAKE_${lang}_FLAGS})
  13   ELSE(CMAKE_${lang}_FLAGS)
  14     SET(CMAKE_${lang}_COMPILER_ID_FLAGS $ENV{${flagvar}})
  15   ENDIF(CMAKE_${lang}_FLAGS)
  16   STRING(REGEX REPLACE " " ";" CMAKE_${lang}_COMPILER_ID_FLAGS_LIST "${CMAKE_${lang}_COMPILER_ID_FLAGS}")
  17
  18   # Compute the directory in which to run the test.
  19   SET(CMAKE_${lang}_COMPILER_ID_DIR ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CompilerId${lang})
  20
  21   # Try building with no extra flags and then try each set
  22   # of helper flags.  Stop when the compiler is identified.
  23   FOREACH(flags "" ${CMAKE_${lang}_COMPILER_ID_TEST_FLAGS})
  24     IF(NOT CMAKE_${lang}_COMPILER_ID)
  25       CMAKE_DETERMINE_COMPILER_ID_BUILD("${lang}" "${flags}" "${src}")
  26       FOREACH(file ${COMPILER_${lang}_PRODUCED_FILES})
  27         CMAKE_DETERMINE_COMPILER_ID_CHECK("${lang}" "${CMAKE_${lang}_COMPILER_ID_DIR}/${file}" "${src}")
  28       ENDFOREACH(file)
  29     ENDIF(NOT CMAKE_${lang}_COMPILER_ID)
  30   ENDFOREACH(flags)
  31
  32   # if the format is unknown after all files have been checked, put "Unknown" in the cache
  33   IF(NOT CMAKE_EXECUTABLE_FORMAT)
  34     SET(CMAKE_EXECUTABLE_FORMAT "Unknown" CACHE INTERNAL "Executable file format")
  35   ENDIF(NOT CMAKE_EXECUTABLE_FORMAT)
  36
  37   # Display the final identification result.
  38   IF(CMAKE_${lang}_COMPILER_ID)
  39     MESSAGE(STATUS "The ${lang} compiler identification is "
  40       "${CMAKE_${lang}_COMPILER_ID}")
  41   ELSE(CMAKE_${lang}_COMPILER_ID)
  42     MESSAGE(STATUS "The ${lang} compiler identification is unknown")
  43   ENDIF(CMAKE_${lang}_COMPILER_ID)
  44
  45   SET(CMAKE_${lang}_COMPILER_ID "${CMAKE_${lang}_COMPILER_ID}" PARENT_SCOPE)
  46   SET(CMAKE_${lang}_PLATFORM_ID "${CMAKE_${lang}_PLATFORM_ID}" PARENT_SCOPE)
  47 ENDFUNCTION(CMAKE_DETERMINE_COMPILER_ID)
  48
  49 #-----------------------------------------------------------------------------
  50 # Function to write the compiler id source file.
  51 FUNCTION(CMAKE_DETERMINE_COMPILER_ID_WRITE lang src)
  52   FILE(READ ${CMAKE_ROOT}/Modules/${src}.in ID_CONTENT_IN)
  53   STRING(CONFIGURE "${ID_CONTENT_IN}" ID_CONTENT_OUT @ONLY)
  54   FILE(WRITE ${CMAKE_${lang}_COMPILER_ID_DIR}/${src} "${ID_CONTENT_OUT}")
  55 ENDFUNCTION(CMAKE_DETERMINE_COMPILER_ID_WRITE)
  56
  57 #-----------------------------------------------------------------------------
  58 # Function to build the compiler id source file and look for output
  59 # files.
  60 FUNCTION(CMAKE_DETERMINE_COMPILER_ID_BUILD lang testflags src)
  61   # Create a clean working directory.
  62   FILE(REMOVE_RECURSE ${CMAKE_${lang}_COMPILER_ID_DIR})
  63   FILE(MAKE_DIRECTORY ${CMAKE_${lang}_COMPILER_ID_DIR})
  64   CMAKE_DETERMINE_COMPILER_ID_WRITE("${lang}" "${src}")
  65
  66   # Construct a description of this test case.
  67   SET(COMPILER_DESCRIPTION
  68     "Compiler: ${CMAKE_${lang}_COMPILER} ${CMAKE_${lang}_COMPILER_ID_ARG1}
  69 Build flags: ${CMAKE_${lang}_COMPILER_ID_FLAGS_LIST}
  70 Id flags: ${testflags}
  71 ")
  72
  73   # Compile the compiler identification source.
  74   IF(COMMAND EXECUTE_PROCESS)
  75     EXECUTE_PROCESS(
  76       COMMAND ${CMAKE_${lang}_COMPILER}
  77               ${CMAKE_${lang}_COMPILER_ID_ARG1}
  78               ${CMAKE_${lang}_COMPILER_ID_FLAGS_LIST}
  79               ${testflags}
  80               "${src}"
  81       WORKING_DIRECTORY ${CMAKE_${lang}_COMPILER_ID_DIR}
  82       OUTPUT_VARIABLE CMAKE_${lang}_COMPILER_ID_OUTPUT
  83       ERROR_VARIABLE CMAKE_${lang}_COMPILER_ID_OUTPUT
  84       RESULT_VARIABLE CMAKE_${lang}_COMPILER_ID_RESULT
  85       )
  86   ELSE(COMMAND EXECUTE_PROCESS)
  87     EXEC_PROGRAM(
  88       ${CMAKE_${lang}_COMPILER} ${CMAKE_${lang}_COMPILER_ID_DIR}
  89       ARGS ${CMAKE_${lang}_COMPILER_ID_ARG1}
  90            ${CMAKE_${lang}_COMPILER_ID_FLAGS_LIST}
  91            ${testflags}
  92            \"${src}\"
  93       OUTPUT_VARIABLE CMAKE_${lang}_COMPILER_ID_OUTPUT
  94       RETURN_VALUE CMAKE_${lang}_COMPILER_ID_RESULT
  95       )
  96   ENDIF(COMMAND EXECUTE_PROCESS)
  97
  98   # Check the result of compilation.
  99   IF(CMAKE_${lang}_COMPILER_ID_RESULT)
 100     # Compilation failed.
 101     SET(MSG
 102       "Compiling the ${lang} compiler identification source file \"${src}\" failed.
 103 ${COMPILER_DESCRIPTION}
 104 The output was:
 105 ${CMAKE_${lang}_COMPILER_ID_RESULT}
 106 ${CMAKE_${lang}_COMPILER_ID_OUTPUT}
 107
 108 ")
 109     FILE(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log "${MSG}")
 110     #IF(NOT CMAKE_${lang}_COMPILER_ID_ALLOW_FAIL)
 111     #  MESSAGE(FATAL_ERROR "${MSG}")
 112     #ENDIF(NOT CMAKE_${lang}_COMPILER_ID_ALLOW_FAIL)
 113
 114     # No output files should be inspected.
 115     SET(COMPILER_${lang}_PRODUCED_FILES)
 116   ELSE(CMAKE_${lang}_COMPILER_ID_RESULT)
 117     # Compilation succeeded.
 118     FILE(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
 119       "Compiling the ${lang} compiler identification source file \"${src}\" succeeded.
 120 ${COMPILER_DESCRIPTION}
 121 The output was:
 122 ${CMAKE_${lang}_COMPILER_ID_RESULT}
 123 ${CMAKE_${lang}_COMPILER_ID_OUTPUT}
 124
 125 ")
 126
 127     # Find the executable produced by the compiler, try all files in the
 128     # binary dir.
 129     FILE(GLOB COMPILER_${lang}_PRODUCED_FILES
 130       RELATIVE ${CMAKE_${lang}_COMPILER_ID_DIR}
 131       ${CMAKE_${lang}_COMPILER_ID_DIR}/*)
 132     LIST(REMOVE_ITEM COMPILER_${lang}_PRODUCED_FILES "${src}")
 133     FOREACH(file ${COMPILER_${lang}_PRODUCED_FILES})
 134       FILE(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
 135         "Compilation of the ${lang} compiler identification source \""
 136         "${src}\" produced \"${file}\"\n\n")
 137     ENDFOREACH(file)
 138
 139     IF(NOT COMPILER_${lang}_PRODUCED_FILES)
 140       # No executable was found.
 141       FILE(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
 142         "Compilation of the ${lang} compiler identification source \""
 143         "${src}\" did not produce an executable in \""
 144         "${CMAKE_${lang}_COMPILER_ID_DIR}\".\n\n")
 145     ENDIF(NOT COMPILER_${lang}_PRODUCED_FILES)
 146   ENDIF(CMAKE_${lang}_COMPILER_ID_RESULT)
 147
 148   # Return the files produced by the compilation.
 149   SET(COMPILER_${lang}_PRODUCED_FILES "${COMPILER_${lang}_PRODUCED_FILES}" PARENT_SCOPE)
 150 ENDFUNCTION(CMAKE_DETERMINE_COMPILER_ID_BUILD lang testflags src)
 151
 152 #-----------------------------------------------------------------------------
 153 # Function to extract the compiler id from an executable.
 154 FUNCTION(CMAKE_DETERMINE_COMPILER_ID_CHECK lang file)
 155   # Look for a compiler id if not yet known.
 156   IF(NOT CMAKE_${lang}_COMPILER_ID)
 157     # Read the compiler identification string from the executable file.
 158     SET(COMPILER_ID)
 159     SET(PLATFORM_ID)
 160     FILE(STRINGS ${file}
 161       CMAKE_${lang}_COMPILER_ID_STRINGS LIMIT_COUNT 2 REGEX "INFO:")
 162     SET(HAVE_COMPILER_TWICE 0)
 163     FOREACH(info ${CMAKE_${lang}_COMPILER_ID_STRINGS})
 164       IF("${info}" MATCHES ".*INFO:compiler\\[([^]\"]*)\\].*")
 165         IF(COMPILER_ID)
 166           SET(COMPILER_ID_TWICE 1)
 167         ENDIF(COMPILER_ID)
 168         STRING(REGEX REPLACE ".*INFO:compiler\\[([^]]*)\\].*" "\\1"
 169           COMPILER_ID "${info}")
 170       ENDIF("${info}" MATCHES ".*INFO:compiler\\[([^]\"]*)\\].*")
 171       IF("${info}" MATCHES ".*INFO:platform\\[([^]\"]*)\\].*")
 172         STRING(REGEX REPLACE ".*INFO:platform\\[([^]]*)\\].*" "\\1"
 173           PLATFORM_ID "${info}")
 174       ENDIF("${info}" MATCHES ".*INFO:platform\\[([^]\"]*)\\].*")
 175     ENDFOREACH(info)
 176
 177     # Check if a valid compiler and platform were found.
 178     IF(COMPILER_ID AND NOT COMPILER_ID_TWICE)
 179       SET(CMAKE_${lang}_COMPILER_ID "${COMPILER_ID}")
 180       SET(CMAKE_${lang}_PLATFORM_ID "${PLATFORM_ID}")
 181     ENDIF(COMPILER_ID AND NOT COMPILER_ID_TWICE)
 182
 183     # Check the compiler identification string.
 184     IF(CMAKE_${lang}_COMPILER_ID)
 185       # The compiler identification was found.
 186       FILE(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
 187         "The ${lang} compiler identification is ${CMAKE_${lang}_COMPILER_ID}, found in \""
 188         "${file}\"\n\n")
 189     ELSE(CMAKE_${lang}_COMPILER_ID)
 190       # The compiler identification could not be found.
 191       FILE(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
 192         "The ${lang} compiler identification could not be found in \""
 193         "${file}\"\n\n")
 194     ENDIF(CMAKE_${lang}_COMPILER_ID)
 195   ENDIF(NOT CMAKE_${lang}_COMPILER_ID)
 196
 197   # try to figure out the executable format: ELF, COFF, Mach-O
 198   IF(NOT CMAKE_EXECUTABLE_FORMAT)
 199     FILE(READ ${file} CMAKE_EXECUTABLE_MAGIC LIMIT 4 HEX)
 200
 201     # ELF files start with 0x7f"ELF"
 202     IF("${CMAKE_EXECUTABLE_MAGIC}" STREQUAL "7f454c46")
 203       SET(CMAKE_EXECUTABLE_FORMAT "ELF" CACHE INTERNAL "Executable file format")
 204     ENDIF("${CMAKE_EXECUTABLE_MAGIC}" STREQUAL "7f454c46")
 205
 206 #    # COFF (.exe) files start with "MZ"
 207 #    IF("${CMAKE_EXECUTABLE_MAGIC}" MATCHES "4d5a....")
 208 #      SET(CMAKE_EXECUTABLE_FORMAT "COFF" CACHE STRING "Executable file format")
 209 #    ENDIF("${CMAKE_EXECUTABLE_MAGIC}" MATCHES "4d5a....")
 210 #
 211 #    # Mach-O files start with CAFEBABE or FEEDFACE, according to http://radio.weblogs.com/0100490/2003/01/28.html
 212 #    IF("${CMAKE_EXECUTABLE_MAGIC}" MATCHES "cafebabe")
 213 #      SET(CMAKE_EXECUTABLE_FORMAT "MACHO" CACHE STRING "Executable file format")
 214 #    ENDIF("${CMAKE_EXECUTABLE_MAGIC}" MATCHES "cafebabe")
 215 #    IF("${CMAKE_EXECUTABLE_MAGIC}" MATCHES "feedface")
 216 #      SET(CMAKE_EXECUTABLE_FORMAT "MACHO" CACHE STRING "Executable file format")
 217 #    ENDIF("${CMAKE_EXECUTABLE_MAGIC}" MATCHES "feedface")
 218
 219   ENDIF(NOT CMAKE_EXECUTABLE_FORMAT)
 220
 221   # Return the information extracted.
 222   SET(CMAKE_${lang}_COMPILER_ID "${CMAKE_${lang}_COMPILER_ID}" PARENT_SCOPE)
 223   SET(CMAKE_${lang}_PLATFORM_ID "${CMAKE_${lang}_PLATFORM_ID}" PARENT_SCOPE)
 224   SET(CMAKE_EXECUTABLE_FORMAT "${CMAKE_EXECUTABLE_FORMAT}" PARENT_SCOPE)
 225 ENDFUNCTION(CMAKE_DETERMINE_COMPILER_ID_CHECK lang)