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# Function to compile a source file to identify the compiler. This is
# used internally by CMake and should not be included by user code.
# If successful, sets CMAKE_<lang>_COMPILER_ID and CMAKE_<lang>_PLATFORM_ID
FUNCTION(CMAKE_DETERMINE_COMPILER_ID lang flagvar src)
# Make sure the compiler arguments are clean.
STRING(STRIP "${CMAKE_${lang}_COMPILER_ARG1}" CMAKE_${lang}_COMPILER_ID_ARG1)
# Make sure user-specified compiler flags are used.
IF(CMAKE_${lang}_FLAGS)
SET(CMAKE_${lang}_COMPILER_ID_FLAGS ${CMAKE_${lang}_FLAGS})
ELSE(CMAKE_${lang}_FLAGS)
SET(CMAKE_${lang}_COMPILER_ID_FLAGS $ENV{${flagvar}})
ENDIF(CMAKE_${lang}_FLAGS)
STRING(REGEX REPLACE " " ";" CMAKE_${lang}_COMPILER_ID_FLAGS_LIST "${CMAKE_${lang}_COMPILER_ID_FLAGS}")
# Compute the directory in which to run the test.
SET(CMAKE_${lang}_COMPILER_ID_DIR ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CompilerId${lang})
# Try building with no extra flags and then try each set
# of helper flags. Stop when the compiler is identified.
FOREACH(flags "" ${CMAKE_${lang}_COMPILER_ID_TEST_FLAGS})
IF(NOT CMAKE_${lang}_COMPILER_ID)
CMAKE_DETERMINE_COMPILER_ID_BUILD("${lang}" "${flags}" "${src}")
FOREACH(file ${COMPILER_${lang}_PRODUCED_FILES})
CMAKE_DETERMINE_COMPILER_ID_CHECK("${lang}" "${CMAKE_${lang}_COMPILER_ID_DIR}/${file}" "${src}")
ENDFOREACH(file)
ENDIF(NOT CMAKE_${lang}_COMPILER_ID)
ENDFOREACH(flags)
# if the format is unknown after all files have been checked, put "Unknown" in the cache
IF(NOT CMAKE_EXECUTABLE_FORMAT)
SET(CMAKE_EXECUTABLE_FORMAT "Unknown" CACHE INTERNAL "Executable file format")
ENDIF(NOT CMAKE_EXECUTABLE_FORMAT)
# Display the final identification result.
IF(CMAKE_${lang}_COMPILER_ID)
MESSAGE(STATUS "The ${lang} compiler identification is "
"${CMAKE_${lang}_COMPILER_ID}")
ELSE(CMAKE_${lang}_COMPILER_ID)
MESSAGE(STATUS "The ${lang} compiler identification is unknown")
ENDIF(CMAKE_${lang}_COMPILER_ID)
SET(CMAKE_${lang}_COMPILER_ID "${CMAKE_${lang}_COMPILER_ID}" PARENT_SCOPE)
SET(CMAKE_${lang}_PLATFORM_ID "${CMAKE_${lang}_PLATFORM_ID}" PARENT_SCOPE)
ENDFUNCTION(CMAKE_DETERMINE_COMPILER_ID)
#-----------------------------------------------------------------------------
# Function to write the compiler id source file.
FUNCTION(CMAKE_DETERMINE_COMPILER_ID_WRITE lang src)
FILE(READ ${CMAKE_ROOT}/Modules/${src}.in ID_CONTENT_IN)
STRING(CONFIGURE "${ID_CONTENT_IN}" ID_CONTENT_OUT @ONLY)
FILE(WRITE ${CMAKE_${lang}_COMPILER_ID_DIR}/${src} "${ID_CONTENT_OUT}")
ENDFUNCTION(CMAKE_DETERMINE_COMPILER_ID_WRITE)
#-----------------------------------------------------------------------------
# Function to build the compiler id source file and look for output
# files.
FUNCTION(CMAKE_DETERMINE_COMPILER_ID_BUILD lang testflags src)
# Create a clean working directory.
FILE(REMOVE_RECURSE ${CMAKE_${lang}_COMPILER_ID_DIR})
FILE(MAKE_DIRECTORY ${CMAKE_${lang}_COMPILER_ID_DIR})
CMAKE_DETERMINE_COMPILER_ID_WRITE("${lang}" "${src}")
# Construct a description of this test case.
SET(COMPILER_DESCRIPTION
"Compiler: ${CMAKE_${lang}_COMPILER} ${CMAKE_${lang}_COMPILER_ID_ARG1}
Build flags: ${CMAKE_${lang}_COMPILER_ID_FLAGS_LIST}
Id flags: ${testflags}
")
# Compile the compiler identification source.
IF(COMMAND EXECUTE_PROCESS)
EXECUTE_PROCESS(
COMMAND ${CMAKE_${lang}_COMPILER}
${CMAKE_${lang}_COMPILER_ID_ARG1}
${CMAKE_${lang}_COMPILER_ID_FLAGS_LIST}
${testflags}
"${src}"
WORKING_DIRECTORY ${CMAKE_${lang}_COMPILER_ID_DIR}
OUTPUT_VARIABLE CMAKE_${lang}_COMPILER_ID_OUTPUT
ERROR_VARIABLE CMAKE_${lang}_COMPILER_ID_OUTPUT
RESULT_VARIABLE CMAKE_${lang}_COMPILER_ID_RESULT
)
ELSE(COMMAND EXECUTE_PROCESS)
EXEC_PROGRAM(
${CMAKE_${lang}_COMPILER} ${CMAKE_${lang}_COMPILER_ID_DIR}
ARGS ${CMAKE_${lang}_COMPILER_ID_ARG1}
${CMAKE_${lang}_COMPILER_ID_FLAGS_LIST}
${testflags}
\"${src}\"
OUTPUT_VARIABLE CMAKE_${lang}_COMPILER_ID_OUTPUT
RETURN_VALUE CMAKE_${lang}_COMPILER_ID_RESULT
)
ENDIF(COMMAND EXECUTE_PROCESS)
# Check the result of compilation.
IF(CMAKE_${lang}_COMPILER_ID_RESULT)
# Compilation failed.
SET(MSG
"Compiling the ${lang} compiler identification source file \"${src}\" failed.
${COMPILER_DESCRIPTION}
The output was:
${CMAKE_${lang}_COMPILER_ID_RESULT}
${CMAKE_${lang}_COMPILER_ID_OUTPUT}
")
FILE(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log "${MSG}")
#IF(NOT CMAKE_${lang}_COMPILER_ID_ALLOW_FAIL)
# MESSAGE(FATAL_ERROR "${MSG}")
#ENDIF(NOT CMAKE_${lang}_COMPILER_ID_ALLOW_FAIL)
# No output files should be inspected.
SET(COMPILER_${lang}_PRODUCED_FILES)
ELSE(CMAKE_${lang}_COMPILER_ID_RESULT)
# Compilation succeeded.
FILE(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
"Compiling the ${lang} compiler identification source file \"${src}\" succeeded.
${COMPILER_DESCRIPTION}
The output was:
${CMAKE_${lang}_COMPILER_ID_RESULT}
${CMAKE_${lang}_COMPILER_ID_OUTPUT}
")
# Find the executable produced by the compiler, try all files in the
# binary dir.
FILE(GLOB COMPILER_${lang}_PRODUCED_FILES
RELATIVE ${CMAKE_${lang}_COMPILER_ID_DIR}
${CMAKE_${lang}_COMPILER_ID_DIR}/*)
LIST(REMOVE_ITEM COMPILER_${lang}_PRODUCED_FILES "${src}")
FOREACH(file ${COMPILER_${lang}_PRODUCED_FILES})
FILE(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
"Compilation of the ${lang} compiler identification source \""
"${src}\" produced \"${file}\"\n\n")
ENDFOREACH(file)
IF(NOT COMPILER_${lang}_PRODUCED_FILES)
# No executable was found.
FILE(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
"Compilation of the ${lang} compiler identification source \""
"${src}\" did not produce an executable in \""
"${CMAKE_${lang}_COMPILER_ID_DIR}\".\n\n")
ENDIF(NOT COMPILER_${lang}_PRODUCED_FILES)
ENDIF(CMAKE_${lang}_COMPILER_ID_RESULT)
# Return the files produced by the compilation.
SET(COMPILER_${lang}_PRODUCED_FILES "${COMPILER_${lang}_PRODUCED_FILES}" PARENT_SCOPE)
ENDFUNCTION(CMAKE_DETERMINE_COMPILER_ID_BUILD lang testflags src)
#-----------------------------------------------------------------------------
# Function to extract the compiler id from an executable.
FUNCTION(CMAKE_DETERMINE_COMPILER_ID_CHECK lang file)
# Look for a compiler id if not yet known.
IF(NOT CMAKE_${lang}_COMPILER_ID)
# Read the compiler identification string from the executable file.
SET(COMPILER_ID)
SET(PLATFORM_ID)
FILE(STRINGS ${file}
CMAKE_${lang}_COMPILER_ID_STRINGS LIMIT_COUNT 2 REGEX "INFO:")
SET(HAVE_COMPILER_TWICE 0)
FOREACH(info ${CMAKE_${lang}_COMPILER_ID_STRINGS})
IF("${info}" MATCHES ".*INFO:compiler\\[([^]\"]*)\\].*")
IF(COMPILER_ID)
SET(COMPILER_ID_TWICE 1)
ENDIF(COMPILER_ID)
STRING(REGEX REPLACE ".*INFO:compiler\\[([^]]*)\\].*" "\\1"
COMPILER_ID "${info}")
ENDIF("${info}" MATCHES ".*INFO:compiler\\[([^]\"]*)\\].*")
IF("${info}" MATCHES ".*INFO:platform\\[([^]\"]*)\\].*")
STRING(REGEX REPLACE ".*INFO:platform\\[([^]]*)\\].*" "\\1"
PLATFORM_ID "${info}")
ENDIF("${info}" MATCHES ".*INFO:platform\\[([^]\"]*)\\].*")
ENDFOREACH(info)
# Check if a valid compiler and platform were found.
IF(COMPILER_ID AND NOT COMPILER_ID_TWICE)
SET(CMAKE_${lang}_COMPILER_ID "${COMPILER_ID}")
SET(CMAKE_${lang}_PLATFORM_ID "${PLATFORM_ID}")
ENDIF(COMPILER_ID AND NOT COMPILER_ID_TWICE)
# Check the compiler identification string.
IF(CMAKE_${lang}_COMPILER_ID)
# The compiler identification was found.
FILE(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
"The ${lang} compiler identification is ${CMAKE_${lang}_COMPILER_ID}, found in \""
"${file}\"\n\n")
ELSE(CMAKE_${lang}_COMPILER_ID)
# The compiler identification could not be found.
FILE(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
"The ${lang} compiler identification could not be found in \""
"${file}\"\n\n")
ENDIF(CMAKE_${lang}_COMPILER_ID)
ENDIF(NOT CMAKE_${lang}_COMPILER_ID)
# try to figure out the executable format: ELF, COFF, Mach-O
IF(NOT CMAKE_EXECUTABLE_FORMAT)
FILE(READ ${file} CMAKE_EXECUTABLE_MAGIC LIMIT 4 HEX)
# ELF files start with 0x7f"ELF"
IF("${CMAKE_EXECUTABLE_MAGIC}" STREQUAL "7f454c46")
SET(CMAKE_EXECUTABLE_FORMAT "ELF" CACHE INTERNAL "Executable file format")
ENDIF("${CMAKE_EXECUTABLE_MAGIC}" STREQUAL "7f454c46")
# # COFF (.exe) files start with "MZ"
# IF("${CMAKE_EXECUTABLE_MAGIC}" MATCHES "4d5a....")
# SET(CMAKE_EXECUTABLE_FORMAT "COFF" CACHE STRING "Executable file format")
# ENDIF("${CMAKE_EXECUTABLE_MAGIC}" MATCHES "4d5a....")
#
# # Mach-O files start with CAFEBABE or FEEDFACE, according to http://radio.weblogs.com/0100490/2003/01/28.html
# IF("${CMAKE_EXECUTABLE_MAGIC}" MATCHES "cafebabe")
# SET(CMAKE_EXECUTABLE_FORMAT "MACHO" CACHE STRING "Executable file format")
# ENDIF("${CMAKE_EXECUTABLE_MAGIC}" MATCHES "cafebabe")
# IF("${CMAKE_EXECUTABLE_MAGIC}" MATCHES "feedface")
# SET(CMAKE_EXECUTABLE_FORMAT "MACHO" CACHE STRING "Executable file format")
# ENDIF("${CMAKE_EXECUTABLE_MAGIC}" MATCHES "feedface")
ENDIF(NOT CMAKE_EXECUTABLE_FORMAT)
# Return the information extracted.
SET(CMAKE_${lang}_COMPILER_ID "${CMAKE_${lang}_COMPILER_ID}" PARENT_SCOPE)
SET(CMAKE_${lang}_PLATFORM_ID "${CMAKE_${lang}_PLATFORM_ID}" PARENT_SCOPE)
SET(CMAKE_EXECUTABLE_FORMAT "${CMAKE_EXECUTABLE_FORMAT}" PARENT_SCOPE)
ENDFUNCTION(CMAKE_DETERMINE_COMPILER_ID_CHECK lang)
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