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new file: replacement for ac_c_bigendian

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git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@7764 ec53bebd-3082-4978-b11e-865c3cabbd6b
This commit is contained in:
Assar Westerlund
2000-01-08 09:42:33 +00:00
parent d56fe61fa0
commit d29ea119d0
1 changed files with 50 additions and 0 deletions
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50
cf/krb-bigendian.m4 Normal file
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dnl
dnl $Id$
dnl
dnl check if this computer is little or big-endian
dnl if we can figure it out at compile-time then don't define the cpp symbol
dnl otherwise test for it and define it. also allow options for overriding
dnl it when cross-compiling
AC_DEFUN(KRB_C_BIGENDIAN, [
AC_CACHE_CHECK(whether byte order is known at compile time,
krb_cv_c_bigendian_compile,
[AC_TRY_COMPILE([
#include <sys/types.h>
#include <sys/param.h>],[
#if !BYTE_ORDER || !BIG_ENDIAN || !LITTLE_ENDIAN
bogus endian macros
#endif], krb_cv_c_bigendian_compile=yes, krb_cv_c_bigendian_compile=no)
if test "$krb_cv_cv_bigendian_compile" = no; then
AC_CACHE_CHECK(whether byte ordering is bigendian, krb_cv_c_bigendian,[
krb_cv_c_bigendian=unknown
AC_TRY_COMPILE([
#include <sys/types.h>
#include <siys/param.h>],[
#if BYTE_ORDER != BIG_ENDIAN
not big endian
#endif], krb_cv_c_bigendian=yes, krb_cv_c_bigendian=no)
if test "$krb_cv_c_bigendian" = "unknown"; then
AC_TRY_RUN([main () {
/* Are we little or big endian? From Harbison&Steele. */
union
{
long l;
char c[sizeof (long)];
} u;
u.l = 1;
exit (u.c[sizeof (long) - 1] == 1);
}], krb_cv_c_bigendian=no, krb_cv_c_bigendian=yes,
AC_ARG_ENABLE(bigendian,[
--enable-bigendian the target is big endian], krb_cv_c_bigendian=yes)
AC_ARG_ENABLE(littleendian,[
--enable-littleendian the target is little endian], krb_cv_c_bigendian=no))
fi
])
if test "$krb_cv_bigendian" = "yes"; then
AC_DEFINE(WORDS_BIGENDIAN, 1, [define if target is big endian])dnl
fi
fi
])
])