mirror of
https://github.com/cookiengineer/audacity
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159 lines
3.8 KiB
Plaintext
159 lines
3.8 KiB
Plaintext
dnl @synopsis AC_C_FIND_ENDIAN
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dnl
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dnl Determine endian-ness of target processor.
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dnl @version 1.1 Mar 03 2002
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dnl @author Erik de Castro Lopo <erikd AT mega-nerd DOT com>
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dnl
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dnl Majority written from scratch to replace the standard autoconf macro
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dnl AC_C_BIGENDIAN. Only part remaining from the original it the invocation
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dnl of the AC_TRY_RUN macro.
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dnl
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dnl Permission to use, copy, modify, distribute, and sell this file for any
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dnl purpose is hereby granted without fee, provided that the above copyright
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dnl and this permission notice appear in all copies. No representations are
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dnl made about the suitability of this software for any purpose. It is
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dnl provided "as is" without express or implied warranty.
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dnl Find endian-ness in the following way:
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dnl 1) Look in <endian.h>.
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dnl 2) If 1) fails, look in <sys/types.h> and <sys/param.h>.
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dnl 3) If 1) and 2) fails and not cross compiling run a test program.
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dnl 4) If 1) and 2) fails and cross compiling then guess based on target.
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AC_DEFUN([AC_C_FIND_ENDIAN],
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[AC_CACHE_CHECK(processor byte ordering,
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ac_cv_c_byte_order,
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# Initialize to unknown
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ac_cv_c_byte_order=unknown
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if test x$ac_cv_header_endian_h = xyes ; then
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# First try <endian.h> which should set BYTE_ORDER.
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[AC_TRY_LINK([
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#include <endian.h>
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#if BYTE_ORDER != LITTLE_ENDIAN
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not big endian
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#endif
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], return 0 ;,
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ac_cv_c_byte_order=little
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)]
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[AC_TRY_LINK([
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#include <endian.h>
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#if BYTE_ORDER != BIG_ENDIAN
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not big endian
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#endif
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], return 0 ;,
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ac_cv_c_byte_order=big
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)]
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fi
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if test $ac_cv_c_byte_order = unknown ; then
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[AC_TRY_LINK([
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#include <sys/types.h>
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#include <sys/param.h>
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#if !BYTE_ORDER || !BIG_ENDIAN || !LITTLE_ENDIAN
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bogus endian macros
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#endif
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], return 0 ;,
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[AC_TRY_LINK([
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#include <sys/types.h>
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#include <sys/param.h>
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#if BYTE_ORDER != LITTLE_ENDIAN
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not big endian
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#endif
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], return 0 ;,
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ac_cv_c_byte_order=little
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)]
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[AC_TRY_LINK([
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#include <sys/types.h>
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#include <sys/param.h>
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#if BYTE_ORDER != LITTLE_ENDIAN
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not big endian
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#endif
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], return 0 ;,
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ac_cv_c_byte_order=little
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)]
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)]
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fi
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if test $ac_cv_c_byte_order = unknown ; then
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if test $cross_compiling = yes ; then
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# This is the last resort. Try to guess the target processor endian-ness
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# by looking at the target CPU type.
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[
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case "$target_cpu" in
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alpha* | i?86* | mipsel* | ia64*)
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ac_cv_c_big_endian=0
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ac_cv_c_little_endian=1
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;;
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m68* | mips* | powerpc* | hppa* | sparc*)
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ac_cv_c_big_endian=1
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ac_cv_c_little_endian=0
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;;
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esac
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]
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else
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AC_TRY_RUN(
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[[
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int main (void)
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{ /* Are we little or big endian? From Harbison&Steele. */
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union
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{ long l ;
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char c [sizeof (long)] ;
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} u ;
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u.l = 1 ;
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return (u.c [sizeof (long) - 1] == 1);
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}
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]], , ac_cv_c_byte_order=big,
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ac_cv_c_byte_order=unknown
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)
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AC_TRY_RUN(
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[[int main (void)
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{ /* Are we little or big endian? From Harbison&Steele. */
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union
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{ long l ;
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char c [sizeof (long)] ;
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} u ;
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u.l = 1 ;
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return (u.c [0] == 1);
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}]], , ac_cv_c_byte_order=little,
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ac_cv_c_byte_order=unknown
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)
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fi
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fi
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)
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if test $ac_cv_c_byte_order = big ; then
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ac_cv_c_big_endian=1
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ac_cv_c_little_endian=0
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elif test $ac_cv_c_byte_order = little ; then
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ac_cv_c_big_endian=0
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ac_cv_c_little_endian=1
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else
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ac_cv_c_big_endian=0
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ac_cv_c_little_endian=0
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AC_MSG_WARN([[*****************************************************************]])
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AC_MSG_WARN([[*** Not able to determine endian-ness of target processor. ]])
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AC_MSG_WARN([[*** The constants CPU_IS_BIG_ENDIAN and CPU_IS_LITTLE_ENDIAN in ]])
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AC_MSG_WARN([[*** src/config.h may need to be hand editied. ]])
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AC_MSG_WARN([[*****************************************************************]])
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fi
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])# AC_C_FIND_ENDIAN
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