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Diffstat (limited to 'Modules/TestBigEndian.cmake')
| -rw-r--r-- | Modules/TestBigEndian.cmake | 119 |
1 files changed, 119 insertions, 0 deletions
diff --git a/Modules/TestBigEndian.cmake b/Modules/TestBigEndian.cmake new file mode 100644 index 0000000..fcb41ab --- /dev/null +++ b/Modules/TestBigEndian.cmake @@ -0,0 +1,119 @@ +#.rst: +# TestBigEndian +# ------------- +# +# Define macro to determine endian type +# +# Check if the system is big endian or little endian +# +# :: +# +# TEST_BIG_ENDIAN(VARIABLE) +# VARIABLE - variable to store the result to + +#============================================================================= +# Copyright 2002-2009 Kitware, Inc. +# +# Distributed under the OSI-approved BSD License (the "License"); +# see accompanying file Copyright.txt for details. +# +# This software is distributed WITHOUT ANY WARRANTY; without even the +# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. +# See the License for more information. +#============================================================================= +# (To distribute this file outside of CMake, substitute the full +# License text for the above reference.) + +macro(TEST_BIG_ENDIAN VARIABLE) + if(NOT DEFINED HAVE_${VARIABLE}) + message(STATUS "Check if the system is big endian") + message(STATUS "Searching 16 bit integer") + + include(CheckTypeSize) + + CHECK_TYPE_SIZE("unsigned short" CMAKE_SIZEOF_UNSIGNED_SHORT) + if(CMAKE_SIZEOF_UNSIGNED_SHORT EQUAL 2) + message(STATUS "Using unsigned short") + set(CMAKE_16BIT_TYPE "unsigned short") + else() + CHECK_TYPE_SIZE("unsigned int" CMAKE_SIZEOF_UNSIGNED_INT) + if(CMAKE_SIZEOF_UNSIGNED_INT) + message(STATUS "Using unsigned int") + set(CMAKE_16BIT_TYPE "unsigned int") + + else() + + CHECK_TYPE_SIZE("unsigned long" CMAKE_SIZEOF_UNSIGNED_LONG) + if(CMAKE_SIZEOF_UNSIGNED_LONG) + message(STATUS "Using unsigned long") + set(CMAKE_16BIT_TYPE "unsigned long") + else() + message(FATAL_ERROR "no suitable type found") + endif() + + endif() + + endif() + + + configure_file("${CMAKE_ROOT}/Modules/TestEndianess.c.in" + "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/TestEndianess.c" + @ONLY) + + file(READ "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/TestEndianess.c" + TEST_ENDIANESS_FILE_CONTENT) + + try_compile(HAVE_${VARIABLE} + "${CMAKE_BINARY_DIR}" + "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/TestEndianess.c" + OUTPUT_VARIABLE OUTPUT + COPY_FILE "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/TestEndianess.bin" ) + + if(HAVE_${VARIABLE}) + + file(STRINGS "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/TestEndianess.bin" + CMAKE_TEST_ENDIANESS_STRINGS_LE LIMIT_COUNT 1 REGEX "THIS IS LITTLE ENDIAN") + + file(STRINGS "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/TestEndianess.bin" + CMAKE_TEST_ENDIANESS_STRINGS_BE LIMIT_COUNT 1 REGEX "THIS IS BIG ENDIAN") + + # on mac, if there are universal binaries built both will be true + # return the result depending on the machine on which cmake runs + if(CMAKE_TEST_ENDIANESS_STRINGS_BE AND CMAKE_TEST_ENDIANESS_STRINGS_LE) + if(CMAKE_SYSTEM_PROCESSOR MATCHES powerpc) + set(CMAKE_TEST_ENDIANESS_STRINGS_BE TRUE) + set(CMAKE_TEST_ENDIANESS_STRINGS_LE FALSE) + else() + set(CMAKE_TEST_ENDIANESS_STRINGS_BE FALSE) + set(CMAKE_TEST_ENDIANESS_STRINGS_LE TRUE) + endif() + message(STATUS "TEST_BIG_ENDIAN found different results, consider setting CMAKE_OSX_ARCHITECTURES or CMAKE_TRY_COMPILE_OSX_ARCHITECTURES to one or no architecture !") + endif() + + if(CMAKE_TEST_ENDIANESS_STRINGS_LE) + set(${VARIABLE} 0 CACHE INTERNAL "Result of TEST_BIG_ENDIAN" FORCE) + message(STATUS "Check if the system is big endian - little endian") + endif() + + if(CMAKE_TEST_ENDIANESS_STRINGS_BE) + set(${VARIABLE} 1 CACHE INTERNAL "Result of TEST_BIG_ENDIAN" FORCE) + message(STATUS "Check if the system is big endian - big endian") + endif() + + if(NOT CMAKE_TEST_ENDIANESS_STRINGS_BE AND NOT CMAKE_TEST_ENDIANESS_STRINGS_LE) + message(SEND_ERROR "TEST_BIG_ENDIAN found no result!") + endif() + + file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log + "Determining if the system is big endian passed with the following output:\n${OUTPUT}\nTestEndianess.c:\n${TEST_ENDIANESS_FILE_CONTENT}\n\n") + + else() + message(STATUS "Check if the system is big endian - failed") + file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log + "Determining if the system is big endian failed with the following output:\n${OUTPUT}\nTestEndianess.c:\n${TEST_ENDIANESS_FILE_CONTENT}\n\n") + set(${VARIABLE}) + endif() + endif() +endmacro() + + |