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- # Distributed under the OSI-approved BSD 3-Clause License. See accompanying
- # file Copyright.txt or https://cmake.org/licensing for details.
- #[=======================================================================[.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
- #]=======================================================================]
- include(CheckTypeSize)
- 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")
- if(CMAKE_C_COMPILER_LOADED)
- set(_test_language "C")
- elseif(CMAKE_CXX_COMPILER_LOADED)
- set(_test_language "CXX")
- else()
- message(FATAL_ERROR "TEST_BIG_ENDIAN needs either C or CXX language enabled")
- endif()
- CHECK_TYPE_SIZE("unsigned short" CMAKE_SIZEOF_UNSIGNED_SHORT LANGUAGE ${_test_language})
- 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 LANGUAGE ${_test_language})
- 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 LANGUAGE ${_test_language})
- if(CMAKE_SIZEOF_UNSIGNED_LONG)
- message(STATUS "Using unsigned long")
- set(CMAKE_16BIT_TYPE "unsigned long")
- else()
- message(FATAL_ERROR "no suitable type found")
- endif()
- endif()
- endif()
- if(_test_language STREQUAL "CXX")
- set(_test_file "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/TestEndianess.cpp")
- else()
- set(_test_file "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/TestEndianess.c")
- endif()
- configure_file("${CMAKE_ROOT}/Modules/TestEndianess.c.in"
- ${_test_file}
- @ONLY)
- file(READ ${_test_file} TEST_ENDIANESS_FILE_CONTENT)
- try_compile(HAVE_${VARIABLE}
- "${CMAKE_BINARY_DIR}"
- ${_test_file}
- OUTPUT_VARIABLE OUTPUT
- COPY_FILE "${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}/CMakeOutput.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()
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