239 lines
10 KiB
CMake
239 lines
10 KiB
CMake
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#=============================================================================
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# Copyright 2007-2009 Kitware, Inc.
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#
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# Distributed under the OSI-approved BSD License (the "License");
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# see accompanying file Copyright.txt for details.
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#
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# This software is distributed WITHOUT ANY WARRANTY; without even the
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# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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# See the License for more information.
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#=============================================================================
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# (To distributed this file outside of CMake, substitute the full
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# License text for the above reference.)
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# Function to compile a source file to identify the compiler. This is
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# used internally by CMake and should not be included by user code.
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# If successful, sets CMAKE_<lang>_COMPILER_ID and CMAKE_<lang>_PLATFORM_ID
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FUNCTION(CMAKE_DETERMINE_COMPILER_ID lang flagvar src)
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# Make sure the compiler arguments are clean.
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STRING(STRIP "${CMAKE_${lang}_COMPILER_ARG1}" CMAKE_${lang}_COMPILER_ID_ARG1)
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# Make sure user-specified compiler flags are used.
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IF(CMAKE_${lang}_FLAGS)
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SET(CMAKE_${lang}_COMPILER_ID_FLAGS ${CMAKE_${lang}_FLAGS})
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ELSE(CMAKE_${lang}_FLAGS)
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SET(CMAKE_${lang}_COMPILER_ID_FLAGS $ENV{${flagvar}})
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ENDIF(CMAKE_${lang}_FLAGS)
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STRING(REGEX REPLACE " " ";" CMAKE_${lang}_COMPILER_ID_FLAGS_LIST "${CMAKE_${lang}_COMPILER_ID_FLAGS}")
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# Compute the directory in which to run the test.
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SET(CMAKE_${lang}_COMPILER_ID_DIR ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CompilerId${lang})
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# Try building with no extra flags and then try each set
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# of helper flags. Stop when the compiler is identified.
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FOREACH(flags "" ${CMAKE_${lang}_COMPILER_ID_TEST_FLAGS})
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IF(NOT CMAKE_${lang}_COMPILER_ID)
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CMAKE_DETERMINE_COMPILER_ID_BUILD("${lang}" "${flags}" "${src}")
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FOREACH(file ${COMPILER_${lang}_PRODUCED_FILES})
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CMAKE_DETERMINE_COMPILER_ID_CHECK("${lang}" "${CMAKE_${lang}_COMPILER_ID_DIR}/${file}" "${src}")
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ENDFOREACH(file)
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ENDIF(NOT CMAKE_${lang}_COMPILER_ID)
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ENDFOREACH(flags)
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# if the format is unknown after all files have been checked, put "Unknown" in the cache
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IF(NOT CMAKE_EXECUTABLE_FORMAT)
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SET(CMAKE_EXECUTABLE_FORMAT "Unknown" CACHE INTERNAL "Executable file format")
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ENDIF(NOT CMAKE_EXECUTABLE_FORMAT)
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# Display the final identification result.
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IF(CMAKE_${lang}_COMPILER_ID)
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MESSAGE(STATUS "The ${lang} compiler identification is "
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"${CMAKE_${lang}_COMPILER_ID}")
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ELSE(CMAKE_${lang}_COMPILER_ID)
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MESSAGE(STATUS "The ${lang} compiler identification is unknown")
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ENDIF(CMAKE_${lang}_COMPILER_ID)
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SET(CMAKE_${lang}_COMPILER_ID "${CMAKE_${lang}_COMPILER_ID}" PARENT_SCOPE)
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SET(CMAKE_${lang}_PLATFORM_ID "${CMAKE_${lang}_PLATFORM_ID}" PARENT_SCOPE)
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ENDFUNCTION(CMAKE_DETERMINE_COMPILER_ID)
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#-----------------------------------------------------------------------------
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# Function to write the compiler id source file.
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FUNCTION(CMAKE_DETERMINE_COMPILER_ID_WRITE lang src)
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FILE(READ ${CMAKE_ROOT}/Modules/${src}.in ID_CONTENT_IN)
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STRING(CONFIGURE "${ID_CONTENT_IN}" ID_CONTENT_OUT @ONLY)
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FILE(WRITE ${CMAKE_${lang}_COMPILER_ID_DIR}/${src} "${ID_CONTENT_OUT}")
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ENDFUNCTION(CMAKE_DETERMINE_COMPILER_ID_WRITE)
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#-----------------------------------------------------------------------------
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# Function to build the compiler id source file and look for output
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# files.
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FUNCTION(CMAKE_DETERMINE_COMPILER_ID_BUILD lang testflags src)
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# Create a clean working directory.
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FILE(REMOVE_RECURSE ${CMAKE_${lang}_COMPILER_ID_DIR})
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FILE(MAKE_DIRECTORY ${CMAKE_${lang}_COMPILER_ID_DIR})
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CMAKE_DETERMINE_COMPILER_ID_WRITE("${lang}" "${src}")
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# Construct a description of this test case.
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SET(COMPILER_DESCRIPTION
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"Compiler: ${CMAKE_${lang}_COMPILER} ${CMAKE_${lang}_COMPILER_ID_ARG1}
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Build flags: ${CMAKE_${lang}_COMPILER_ID_FLAGS_LIST}
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Id flags: ${testflags}
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")
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# Compile the compiler identification source.
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IF(COMMAND EXECUTE_PROCESS)
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EXECUTE_PROCESS(
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COMMAND ${CMAKE_${lang}_COMPILER}
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${CMAKE_${lang}_COMPILER_ID_ARG1}
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${CMAKE_${lang}_COMPILER_ID_FLAGS_LIST}
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${testflags}
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"${src}"
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WORKING_DIRECTORY ${CMAKE_${lang}_COMPILER_ID_DIR}
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OUTPUT_VARIABLE CMAKE_${lang}_COMPILER_ID_OUTPUT
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ERROR_VARIABLE CMAKE_${lang}_COMPILER_ID_OUTPUT
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RESULT_VARIABLE CMAKE_${lang}_COMPILER_ID_RESULT
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)
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ELSE(COMMAND EXECUTE_PROCESS)
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EXEC_PROGRAM(
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${CMAKE_${lang}_COMPILER} ${CMAKE_${lang}_COMPILER_ID_DIR}
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ARGS ${CMAKE_${lang}_COMPILER_ID_ARG1}
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${CMAKE_${lang}_COMPILER_ID_FLAGS_LIST}
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${testflags}
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\"${src}\"
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OUTPUT_VARIABLE CMAKE_${lang}_COMPILER_ID_OUTPUT
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RETURN_VALUE CMAKE_${lang}_COMPILER_ID_RESULT
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)
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ENDIF(COMMAND EXECUTE_PROCESS)
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# Check the result of compilation.
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IF(CMAKE_${lang}_COMPILER_ID_RESULT)
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# Compilation failed.
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SET(MSG
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"Compiling the ${lang} compiler identification source file \"${src}\" failed.
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${COMPILER_DESCRIPTION}
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The output was:
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${CMAKE_${lang}_COMPILER_ID_RESULT}
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${CMAKE_${lang}_COMPILER_ID_OUTPUT}
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")
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FILE(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log "${MSG}")
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#IF(NOT CMAKE_${lang}_COMPILER_ID_ALLOW_FAIL)
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# MESSAGE(FATAL_ERROR "${MSG}")
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#ENDIF(NOT CMAKE_${lang}_COMPILER_ID_ALLOW_FAIL)
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# No output files should be inspected.
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SET(COMPILER_${lang}_PRODUCED_FILES)
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ELSE(CMAKE_${lang}_COMPILER_ID_RESULT)
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# Compilation succeeded.
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FILE(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
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"Compiling the ${lang} compiler identification source file \"${src}\" succeeded.
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${COMPILER_DESCRIPTION}
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The output was:
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${CMAKE_${lang}_COMPILER_ID_RESULT}
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${CMAKE_${lang}_COMPILER_ID_OUTPUT}
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")
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# Find the executable produced by the compiler, try all files in the
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# binary dir.
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FILE(GLOB COMPILER_${lang}_PRODUCED_FILES
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RELATIVE ${CMAKE_${lang}_COMPILER_ID_DIR}
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${CMAKE_${lang}_COMPILER_ID_DIR}/*)
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LIST(REMOVE_ITEM COMPILER_${lang}_PRODUCED_FILES "${src}")
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FOREACH(file ${COMPILER_${lang}_PRODUCED_FILES})
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FILE(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
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"Compilation of the ${lang} compiler identification source \""
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"${src}\" produced \"${file}\"\n\n")
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ENDFOREACH(file)
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IF(NOT COMPILER_${lang}_PRODUCED_FILES)
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# No executable was found.
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FILE(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
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"Compilation of the ${lang} compiler identification source \""
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"${src}\" did not produce an executable in \""
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"${CMAKE_${lang}_COMPILER_ID_DIR}\".\n\n")
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ENDIF(NOT COMPILER_${lang}_PRODUCED_FILES)
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ENDIF(CMAKE_${lang}_COMPILER_ID_RESULT)
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# Return the files produced by the compilation.
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SET(COMPILER_${lang}_PRODUCED_FILES "${COMPILER_${lang}_PRODUCED_FILES}" PARENT_SCOPE)
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ENDFUNCTION(CMAKE_DETERMINE_COMPILER_ID_BUILD lang testflags src)
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#-----------------------------------------------------------------------------
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# Function to extract the compiler id from an executable.
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FUNCTION(CMAKE_DETERMINE_COMPILER_ID_CHECK lang file)
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# Look for a compiler id if not yet known.
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IF(NOT CMAKE_${lang}_COMPILER_ID)
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# Read the compiler identification string from the executable file.
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SET(COMPILER_ID)
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SET(PLATFORM_ID)
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FILE(STRINGS ${file}
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CMAKE_${lang}_COMPILER_ID_STRINGS LIMIT_COUNT 2 REGEX "INFO:")
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SET(HAVE_COMPILER_TWICE 0)
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FOREACH(info ${CMAKE_${lang}_COMPILER_ID_STRINGS})
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IF("${info}" MATCHES ".*INFO:compiler\\[([^]\"]*)\\].*")
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IF(COMPILER_ID)
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SET(COMPILER_ID_TWICE 1)
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ENDIF(COMPILER_ID)
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STRING(REGEX REPLACE ".*INFO:compiler\\[([^]]*)\\].*" "\\1"
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COMPILER_ID "${info}")
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ENDIF("${info}" MATCHES ".*INFO:compiler\\[([^]\"]*)\\].*")
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IF("${info}" MATCHES ".*INFO:platform\\[([^]\"]*)\\].*")
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STRING(REGEX REPLACE ".*INFO:platform\\[([^]]*)\\].*" "\\1"
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PLATFORM_ID "${info}")
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ENDIF("${info}" MATCHES ".*INFO:platform\\[([^]\"]*)\\].*")
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ENDFOREACH(info)
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# Check if a valid compiler and platform were found.
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IF(COMPILER_ID AND NOT COMPILER_ID_TWICE)
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SET(CMAKE_${lang}_COMPILER_ID "${COMPILER_ID}")
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SET(CMAKE_${lang}_PLATFORM_ID "${PLATFORM_ID}")
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ENDIF(COMPILER_ID AND NOT COMPILER_ID_TWICE)
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# Check the compiler identification string.
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IF(CMAKE_${lang}_COMPILER_ID)
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# The compiler identification was found.
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FILE(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
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"The ${lang} compiler identification is ${CMAKE_${lang}_COMPILER_ID}, found in \""
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"${file}\"\n\n")
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ELSE(CMAKE_${lang}_COMPILER_ID)
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# The compiler identification could not be found.
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FILE(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
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"The ${lang} compiler identification could not be found in \""
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"${file}\"\n\n")
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ENDIF(CMAKE_${lang}_COMPILER_ID)
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ENDIF(NOT CMAKE_${lang}_COMPILER_ID)
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# try to figure out the executable format: ELF, COFF, Mach-O
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IF(NOT CMAKE_EXECUTABLE_FORMAT)
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FILE(READ ${file} CMAKE_EXECUTABLE_MAGIC LIMIT 4 HEX)
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# ELF files start with 0x7f"ELF"
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IF("${CMAKE_EXECUTABLE_MAGIC}" STREQUAL "7f454c46")
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SET(CMAKE_EXECUTABLE_FORMAT "ELF" CACHE INTERNAL "Executable file format")
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ENDIF("${CMAKE_EXECUTABLE_MAGIC}" STREQUAL "7f454c46")
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# # COFF (.exe) files start with "MZ"
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# IF("${CMAKE_EXECUTABLE_MAGIC}" MATCHES "4d5a....")
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# SET(CMAKE_EXECUTABLE_FORMAT "COFF" CACHE STRING "Executable file format")
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# ENDIF("${CMAKE_EXECUTABLE_MAGIC}" MATCHES "4d5a....")
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#
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# # Mach-O files start with CAFEBABE or FEEDFACE, according to http://radio.weblogs.com/0100490/2003/01/28.html
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# IF("${CMAKE_EXECUTABLE_MAGIC}" MATCHES "cafebabe")
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# SET(CMAKE_EXECUTABLE_FORMAT "MACHO" CACHE STRING "Executable file format")
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# ENDIF("${CMAKE_EXECUTABLE_MAGIC}" MATCHES "cafebabe")
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# IF("${CMAKE_EXECUTABLE_MAGIC}" MATCHES "feedface")
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# SET(CMAKE_EXECUTABLE_FORMAT "MACHO" CACHE STRING "Executable file format")
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# ENDIF("${CMAKE_EXECUTABLE_MAGIC}" MATCHES "feedface")
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ENDIF(NOT CMAKE_EXECUTABLE_FORMAT)
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# Return the information extracted.
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SET(CMAKE_${lang}_COMPILER_ID "${CMAKE_${lang}_COMPILER_ID}" PARENT_SCOPE)
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SET(CMAKE_${lang}_PLATFORM_ID "${CMAKE_${lang}_PLATFORM_ID}" PARENT_SCOPE)
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SET(CMAKE_EXECUTABLE_FORMAT "${CMAKE_EXECUTABLE_FORMAT}" PARENT_SCOPE)
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ENDFUNCTION(CMAKE_DETERMINE_COMPILER_ID_CHECK lang)
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