64 lines
2.0 KiB
Plaintext
64 lines
2.0 KiB
Plaintext
dnl
|
|
dnl $KTH-KRB: krb-bigendian.m4,v 1.8 2002/08/28 19:20:19 joda Exp $
|
|
dnl $NetBSD: krb-bigendian.m4,v 1.1.1.2 2002/09/12 12:22:14 joda Exp $
|
|
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_ARG_ENABLE(bigendian,
|
|
AC_HELP_STRING([--enable-bigendian],[the target is big endian]),
|
|
krb_cv_c_bigendian=yes)
|
|
AC_ARG_ENABLE(littleendian,
|
|
AC_HELP_STRING([--enable-littleendian],[the target is little endian]),
|
|
krb_cv_c_bigendian=no)
|
|
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)])
|
|
AC_CACHE_CHECK(whether byte ordering is bigendian, krb_cv_c_bigendian,[
|
|
if test "$krb_cv_c_bigendian_compile" = "yes"; then
|
|
AC_TRY_COMPILE([
|
|
#include <sys/types.h>
|
|
#include <sys/param.h>],[
|
|
#if BYTE_ORDER != BIG_ENDIAN
|
|
not big endian
|
|
#endif], krb_cv_c_bigendian=yes, krb_cv_c_bigendian=no)
|
|
else
|
|
AC_TRY_RUN([main () {
|
|
/* Are we little or big endian? From Harbison&Steele. */
|
|
union
|
|
{
|
|
long l;
|
|
char c[sizeof (long)];
|
|
} u;
|
|
u.l = 1;
|
|
exit (u.c[sizeof (long) - 1] == 1);
|
|
}], krb_cv_c_bigendian=no, krb_cv_c_bigendian=yes,
|
|
AC_MSG_ERROR([specify either --enable-bigendian or --enable-littleendian]))
|
|
fi
|
|
])
|
|
if test "$krb_cv_c_bigendian" = "yes"; then
|
|
AC_DEFINE(WORDS_BIGENDIAN, 1, [define if target is big endian])dnl
|
|
fi
|
|
if test "$krb_cv_c_bigendian_compile" = "yes"; then
|
|
AC_DEFINE(ENDIANESS_IN_SYS_PARAM_H, 1, [define if sys/param.h defines the endiness])dnl
|
|
fi
|
|
AH_BOTTOM([
|
|
#if ENDIANESS_IN_SYS_PARAM_H
|
|
# include <sys/types.h>
|
|
# include <sys/param.h>
|
|
# if BYTE_ORDER == BIG_ENDIAN
|
|
# define WORDS_BIGENDIAN 1
|
|
# endif
|
|
#endif
|
|
])
|
|
])
|