Modules/TestBigEndian.cmake

   1 # - Define macro to determine endian type
   2 # Check if the system is big endian or little endian
   3 #  TEST_BIG_ENDIAN(VARIABLE)
   4 #  VARIABLE - variable to store the result to
   5 #
   6
   7 MACRO(TEST_BIG_ENDIAN VARIABLE)
   8   IF("HAVE_${VARIABLE}" MATCHES "^HAVE_${VARIABLE}$")
   9     MESSAGE(STATUS "Check if the system is big endian")
  10     MESSAGE(STATUS "Searching 16 bit integer")
  11
  12     INCLUDE(CheckTypeSize)
  13
  14     CHECK_TYPE_SIZE("unsigned short" CMAKE_SIZEOF_UNSIGNED_SHORT)
  15     IF(CMAKE_SIZEOF_UNSIGNED_SHORT EQUAL 2)
  16       MESSAGE(STATUS "Using unsigned short")
  17       SET(CMAKE_16BIT_TYPE "unsigned short")
  18     ELSE(CMAKE_SIZEOF_UNSIGNED_SHORT EQUAL 2)
  19       CHECK_TYPE_SIZE("unsigned int"   CMAKE_SIZEOF_UNSIGNED_INT)
  20       IF(CMAKE_SIZEOF_UNSIGNED_INT)
  21         MESSAGE(STATUS "Using unsigned int")
  22         SET(CMAKE_16BIT_TYPE "unsigned int")
  23
  24       ELSE(CMAKE_SIZEOF_UNSIGNED_INT)
  25
  26         CHECK_TYPE_SIZE("unsigned long"  CMAKE_SIZEOF_UNSIGNED_LONG)
  27         IF(CMAKE_SIZEOF_UNSIGNED_LONG)
  28           MESSAGE(STATUS "Using unsigned long")
  29           SET(CMAKE_16BIT_TYPE "unsigned long")
  30         ELSE(CMAKE_SIZEOF_UNSIGNED_LONG)
  31           MESSAGE(FATAL_ERROR "no suitable type found")
  32         ENDIF(CMAKE_SIZEOF_UNSIGNED_LONG)
  33
  34       ENDIF(CMAKE_SIZEOF_UNSIGNED_INT)
  35
  36     ENDIF(CMAKE_SIZEOF_UNSIGNED_SHORT EQUAL 2)
  37
  38
  39     CONFIGURE_FILE("${CMAKE_ROOT}/Modules/TestEndianess.c.in"
  40                    "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/TestEndianess.c"
  41                     IMMEDIATE @ONLY)
  42
  43      FILE(READ "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/TestEndianess.c"
  44           TEST_ENDIANESS_FILE_CONTENT)
  45
  46      TRY_COMPILE(HAVE_${VARIABLE}
  47       "${CMAKE_BINARY_DIR}"
  48       "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/TestEndianess.c"
  49       OUTPUT_VARIABLE OUTPUT
  50       COPY_FILE "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/TestEndianess.bin" )
  51
  52       IF(HAVE_${VARIABLE})
  53
  54         FILE(STRINGS "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/TestEndianess.bin"
  55             CMAKE_TEST_ENDIANESS_STRINGS_LE LIMIT_COUNT 1 REGEX "THIS IS LITTLE ENDIAN")
  56
  57         FILE(STRINGS "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/TestEndianess.bin"
  58             CMAKE_TEST_ENDIANESS_STRINGS_BE LIMIT_COUNT 1 REGEX "THIS IS BIG ENDIAN")
  59
  60         # on mac, if there are universal binaries built both will be true
  61         # return the result depending on the machine on which cmake runs
  62         IF(CMAKE_TEST_ENDIANESS_STRINGS_BE  AND  CMAKE_TEST_ENDIANESS_STRINGS_LE)
  63           IF(CMAKE_SYSTEM_PROCESSOR MATCHES powerpc)
  64             SET(CMAKE_TEST_ENDIANESS_STRINGS_BE TRUE)
  65             SET(CMAKE_TEST_ENDIANESS_STRINGS_LE FALSE)
  66           ELSE(CMAKE_SYSTEM_PROCESSOR MATCHES powerpc)
  67             SET(CMAKE_TEST_ENDIANESS_STRINGS_BE FALSE)
  68             SET(CMAKE_TEST_ENDIANESS_STRINGS_LE TRUE)
  69           ENDIF(CMAKE_SYSTEM_PROCESSOR MATCHES powerpc)
  70           MESSAGE(STATUS "TEST_BIG_ENDIAN found different results, consider setting CMAKE_OSX_ARCHITECTURES or CMAKE_TRY_COMPILE_OSX_ARCHITECTURES to one or no architecture !")
  71         ENDIF(CMAKE_TEST_ENDIANESS_STRINGS_BE  AND  CMAKE_TEST_ENDIANESS_STRINGS_LE)
  72
  73         IF(CMAKE_TEST_ENDIANESS_STRINGS_LE)
  74           SET(${VARIABLE} 0 CACHE INTERNAL "Result of TEST_BIG_ENDIAN" FORCE)
  75           MESSAGE(STATUS "Check if the system is big endian - little endian")
  76         ENDIF(CMAKE_TEST_ENDIANESS_STRINGS_LE)
  77
  78         IF(CMAKE_TEST_ENDIANESS_STRINGS_BE)
  79           SET(${VARIABLE} 1 CACHE INTERNAL "Result of TEST_BIG_ENDIAN" FORCE)
  80           MESSAGE(STATUS "Check if the system is big endian - big endian")
  81         ENDIF(CMAKE_TEST_ENDIANESS_STRINGS_BE)
  82
  83         IF(NOT CMAKE_TEST_ENDIANESS_STRINGS_BE  AND  NOT CMAKE_TEST_ENDIANESS_STRINGS_LE)
  84           MESSAGE(SEND_ERROR "TEST_BIG_ENDIAN found no result!")
  85         ENDIF(NOT CMAKE_TEST_ENDIANESS_STRINGS_BE  AND  NOT CMAKE_TEST_ENDIANESS_STRINGS_LE)
  86
  87         FILE(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
  88           "Determining if the system is big endian passed with the following output:\n${OUTPUT}\nTestEndianess.c:\n${TEST_ENDIANESS_FILE_CONTENT}\n\n")
  89
  90       ELSE(HAVE_${VARIABLE})
  91         MESSAGE(STATUS "Check if the system is big endian - failed")
  92         FILE(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
  93           "Determining if the system is big endian failed with the following output:\n${OUTPUT}\nTestEndianess.c:\n${TEST_ENDIANESS_FILE_CONTENT}\n\n")
  94         SET(${VARIABLE})
  95       ENDIF(HAVE_${VARIABLE})
  96   ENDIF("HAVE_${VARIABLE}" MATCHES "^HAVE_${VARIABLE}$")
  97 ENDMACRO(TEST_BIG_ENDIAN)
  98
  99