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51 lines
1.6 KiB
Plaintext
51 lines
1.6 KiB
Plaintext
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dnl Copyright (C) 1993-2003 Free Software Foundation, Inc.
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dnl This file is free software, distributed under the terms of the GNU
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dnl General Public License. As a special exception to the GNU General
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dnl Public License, this file may be distributed as part of a program
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dnl that contains a configuration script generated by Autoconf, under
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dnl the same distribution terms as the rest of that program.
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dnl From Bruno Haible, Marcus Daniels.
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AC_PREREQ(2.13)
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AC_DEFUN([CL_WORDS_LITTLEENDIAN],
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[AC_CACHE_CHECK(byte ordering, cl_cv_sys_endian, [
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AC_TRY_RUN([int main () {
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/* Are we little or big endian? From Harbison&Steele. */
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union
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{
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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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exit (u.c[0] == 1);
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}],
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cl_cv_sys_endian="big endian",
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cl_cv_sys_endian="little endian",
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: # must guess the endianness
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)
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if test -z "$cl_cv_sys_endian"; then
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AC_EGREP_CPP(yes,[#if defined(m68k) || defined(__m68k__) || defined(mc68000) || defined(mc68020) || defined(__mc68020__) || defined(sparc) || defined(__sparc__) || defined(MIPSEB) || defined(__MIPSEB__) || defined(hppa) || defined(__hppa) || defined(m88000) || defined(__m88k__)
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yes
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#endif
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], cl_cv_sys_endian="big endian")
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fi
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if test -z "$cl_cv_sys_endian"; then
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AC_EGREP_CPP(yes,[#if defined(i386) || defined(__i386) || defined(__i386__) || defined(_I386) || defined(MIPSEL) || defined(__MIPSEL__) || defined(__alpha)
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yes
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#endif
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], cl_cv_sys_endian="little endian")
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fi
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if test -z "$cl_cv_sys_endian"; then
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cl_cv_sys_endian="guessing little endian"
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fi
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])
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case "$cl_cv_sys_endian" in
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*little*)
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AC_DEFINE(WORDS_LITTLEENDIAN, 1,
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[Define if the machine's byte ordering is little endian.]) ;;
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*big*) ;;
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esac
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])
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