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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.
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#.rst:
# TestBigEndian
# -------------
#
# 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)
# VARIABLE - variable to store the result to
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macro ( TEST_BIG_ENDIAN VARIABLE )
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if ( NOT DEFINED HAVE_ ${ VARIABLE } )
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message ( STATUS "Check if the system is big endian" )
message ( STATUS "Searching 16 bit integer" )
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include ( CheckTypeSize )
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CHECK_TYPE_SIZE ( "unsigned short" CMAKE_SIZEOF_UNSIGNED_SHORT )
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if ( CMAKE_SIZEOF_UNSIGNED_SHORT EQUAL 2 )
message ( STATUS "Using unsigned short" )
set ( CMAKE_16BIT_TYPE "unsigned short" )
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else ( )
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CHECK_TYPE_SIZE ( "unsigned int" CMAKE_SIZEOF_UNSIGNED_INT )
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if ( CMAKE_SIZEOF_UNSIGNED_INT )
message ( STATUS "Using unsigned int" )
set ( CMAKE_16BIT_TYPE "unsigned int" )
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else ( )
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CHECK_TYPE_SIZE ( "unsigned long" CMAKE_SIZEOF_UNSIGNED_LONG )
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if ( CMAKE_SIZEOF_UNSIGNED_LONG )
message ( STATUS "Using unsigned long" )
set ( CMAKE_16BIT_TYPE "unsigned long" )
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else ( )
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message ( FATAL_ERROR "no suitable type found" )
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endif ( )
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endif ( )
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endif ( )
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configure_file ( "${CMAKE_ROOT}/Modules/TestEndianess.c.in"
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" $ { C M A K E _ B I N A R Y _ D I R } $ { C M A K E _ F I L E S _ D I R E C T O R Y } / C M a k e T m p / T e s t E n d i a n e s s . c "
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@ O N L Y )
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file ( READ "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/TestEndianess.c"
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T E S T _ E N D I A N E S S _ F I L E _ C O N T E N T )
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try_compile ( HAVE_ ${ VARIABLE }
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" $ { C M A K E _ B I N A R Y _ D I R } "
" $ { C M A K E _ B I N A R Y _ D I R } $ { C M A K E _ F I L E S _ D I R E C T O R Y } / C M a k e T m p / T e s t E n d i a n e s s . c "
O U T P U T _ V A R I A B L E O U T P U T
C O P Y _ F I L E " $ { C M A K E _ B I N A R Y _ D I R } $ { C M A K E _ F I L E S _ D I R E C T O R Y } / T e s t E n d i a n e s s . b i n " )
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if ( HAVE_ ${ VARIABLE } )
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file ( STRINGS "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/TestEndianess.bin"
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C M A K E _ T E S T _ E N D I A N E S S _ S T R I N G S _ L E L I M I T _ C O U N T 1 R E G E X " T H I S I S L I T T L E E N D I A N " )
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file ( STRINGS "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/TestEndianess.bin"
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C M A K E _ T E S T _ E N D I A N E S S _ S T R I N G S _ B E L I M I T _ C O U N T 1 R E G E X " T H I S I S B I G E N D I A N " )
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# on mac, if there are universal binaries built both will be true
# 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 )
if ( CMAKE_SYSTEM_PROCESSOR MATCHES powerpc )
set ( CMAKE_TEST_ENDIANESS_STRINGS_BE TRUE )
set ( CMAKE_TEST_ENDIANESS_STRINGS_LE FALSE )
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else ( )
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set ( CMAKE_TEST_ENDIANESS_STRINGS_BE FALSE )
set ( CMAKE_TEST_ENDIANESS_STRINGS_LE TRUE )
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endif ( )
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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 ( )
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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" )
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endif ( )
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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" )
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endif ( )
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if ( NOT CMAKE_TEST_ENDIANESS_STRINGS_BE AND NOT CMAKE_TEST_ENDIANESS_STRINGS_LE )
message ( SEND_ERROR "TEST_BIG_ENDIAN found no result!" )
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endif ( )
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file ( APPEND ${ CMAKE_BINARY_DIR } ${ CMAKE_FILES_DIRECTORY } /CMakeOutput.log
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" D e t e r m i n i n g i f t h e s y s t e m i s b i g e n d i a n p a s s e d w i t h t h e f o l l o w i n g o u t p u t : \ n $ { O U T P U T } \ n T e s t E n d i a n e s s . c : \ n $ { T E S T _ E N D I A N E S S _ F I L E _ C O N T E N T } \ n \ n " )
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else ( )
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message ( STATUS "Check if the system is big endian - failed" )
file ( APPEND ${ CMAKE_BINARY_DIR } ${ CMAKE_FILES_DIRECTORY } /CMakeError.log
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" D e t e r m i n i n g i f t h e s y s t e m i s b i g e n d i a n f a i l e d w i t h t h e f o l l o w i n g o u t p u t : \ n $ { O U T P U T } \ n T e s t E n d i a n e s s . c : \ n $ { T E S T _ E N D I A N E S S _ F I L E _ C O N T E N T } \ n \ n " )
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set ( ${ VARIABLE } )
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endif ( )
endif ( )
endmacro ( )
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