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https://github.com/reactos/CMake.git
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100 lines
4.5 KiB
CMake
100 lines
4.5 KiB
CMake
# - Define macro to determine endian type
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# Check if the system is big endian or little endian
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# TEST_BIG_ENDIAN(VARIABLE)
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# VARIABLE - variable to store the result to
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#
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MACRO(TEST_BIG_ENDIAN VARIABLE)
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IF("HAVE_${VARIABLE}" MATCHES "^HAVE_${VARIABLE}$")
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MESSAGE(STATUS "Check if the system is big endian")
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MESSAGE(STATUS "Searching 16 bit integer")
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INCLUDE(CheckTypeSize)
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CHECK_TYPE_SIZE("unsigned short" CMAKE_SIZEOF_UNSIGNED_SHORT)
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IF(CMAKE_SIZEOF_UNSIGNED_SHORT EQUAL 2)
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MESSAGE(STATUS "Using unsigned short")
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SET(CMAKE_16BIT_TYPE "unsigned short")
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ELSE(CMAKE_SIZEOF_UNSIGNED_SHORT EQUAL 2)
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CHECK_TYPE_SIZE("unsigned int" CMAKE_SIZEOF_UNSIGNED_INT)
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IF(CMAKE_SIZEOF_UNSIGNED_INT)
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MESSAGE(STATUS "Using unsigned int")
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SET(CMAKE_16BIT_TYPE "unsigned int")
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ELSE(CMAKE_SIZEOF_UNSIGNED_INT)
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CHECK_TYPE_SIZE("unsigned long" CMAKE_SIZEOF_UNSIGNED_LONG)
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IF(CMAKE_SIZEOF_UNSIGNED_LONG)
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MESSAGE(STATUS "Using unsigned long")
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SET(CMAKE_16BIT_TYPE "unsigned long")
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ELSE(CMAKE_SIZEOF_UNSIGNED_LONG)
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MESSAGE(FATAL_ERROR "no suitable type found")
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ENDIF(CMAKE_SIZEOF_UNSIGNED_LONG)
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ENDIF(CMAKE_SIZEOF_UNSIGNED_INT)
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ENDIF(CMAKE_SIZEOF_UNSIGNED_SHORT EQUAL 2)
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CONFIGURE_FILE("${CMAKE_ROOT}/Modules/TestEndianess.c.in"
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"${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/TestEndianess.c"
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IMMEDIATE @ONLY)
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FILE(READ "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/TestEndianess.c"
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TEST_ENDIANESS_FILE_CONTENT)
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TRY_COMPILE(HAVE_${VARIABLE}
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"${CMAKE_BINARY_DIR}"
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"${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/TestEndianess.c"
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OUTPUT_VARIABLE OUTPUT
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COPY_FILE "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/TestEndianess.bin" )
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IF(HAVE_${VARIABLE})
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FILE(STRINGS "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/TestEndianess.bin"
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CMAKE_TEST_ENDIANESS_STRINGS_LE LIMIT_COUNT 1 REGEX "THIS IS LITTLE ENDIAN")
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FILE(STRINGS "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/TestEndianess.bin"
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CMAKE_TEST_ENDIANESS_STRINGS_BE LIMIT_COUNT 1 REGEX "THIS IS BIG ENDIAN")
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# on mac, if there are universal binaries built both will be true
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# return the result depending on the machine on which cmake runs
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IF(CMAKE_TEST_ENDIANESS_STRINGS_BE AND CMAKE_TEST_ENDIANESS_STRINGS_LE)
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IF(CMAKE_SYSTEM_PROCESSOR MATCHES powerpc)
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SET(CMAKE_TEST_ENDIANESS_STRINGS_BE TRUE)
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SET(CMAKE_TEST_ENDIANESS_STRINGS_LE FALSE)
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ELSE(CMAKE_SYSTEM_PROCESSOR MATCHES powerpc)
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SET(CMAKE_TEST_ENDIANESS_STRINGS_BE FALSE)
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SET(CMAKE_TEST_ENDIANESS_STRINGS_LE TRUE)
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ENDIF(CMAKE_SYSTEM_PROCESSOR MATCHES powerpc)
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MESSAGE(STATUS "TEST_BIG_ENDIAN found different results, consider setting CMAKE_OSX_ARCHITECTURES or CMAKE_TRY_COMPILE_OSX_ARCHITECTURES to one or no architecture !")
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ENDIF(CMAKE_TEST_ENDIANESS_STRINGS_BE AND CMAKE_TEST_ENDIANESS_STRINGS_LE)
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IF(CMAKE_TEST_ENDIANESS_STRINGS_LE)
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SET(${VARIABLE} 0 CACHE INTERNAL "Result of TEST_BIG_ENDIAN" FORCE)
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MESSAGE(STATUS "Check if the system is big endian - little endian")
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ENDIF(CMAKE_TEST_ENDIANESS_STRINGS_LE)
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IF(CMAKE_TEST_ENDIANESS_STRINGS_BE)
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SET(${VARIABLE} 1 CACHE INTERNAL "Result of TEST_BIG_ENDIAN" FORCE)
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MESSAGE(STATUS "Check if the system is big endian - big endian")
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ENDIF(CMAKE_TEST_ENDIANESS_STRINGS_BE)
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IF(NOT CMAKE_TEST_ENDIANESS_STRINGS_BE AND NOT CMAKE_TEST_ENDIANESS_STRINGS_LE)
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MESSAGE(SEND_ERROR "TEST_BIG_ENDIAN found no result!")
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ENDIF(NOT CMAKE_TEST_ENDIANESS_STRINGS_BE AND NOT CMAKE_TEST_ENDIANESS_STRINGS_LE)
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FILE(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
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"Determining if the system is big endian passed with the following output:\n${OUTPUT}\nTestEndianess.c:\n${TEST_ENDIANESS_FILE_CONTENT}\n\n")
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ELSE(HAVE_${VARIABLE})
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MESSAGE(STATUS "Check if the system is big endian - failed")
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FILE(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
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"Determining if the system is big endian failed with the following output:\n${OUTPUT}\nTestEndianess.c:\n${TEST_ENDIANESS_FILE_CONTENT}\n\n")
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SET(${VARIABLE})
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ENDIF(HAVE_${VARIABLE})
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ENDIF("HAVE_${VARIABLE}" MATCHES "^HAVE_${VARIABLE}$")
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ENDMACRO(TEST_BIG_ENDIAN)
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