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