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# $Id: endian.m4 595 2004-11-19 16:17:17Z aquamaniac $
# (c) 2006 Martin Preuss<martin@libchipcard.de>
# This function check for endianness
AC_DEFUN([AQ_ENDIAN],[
dnl PREREQUISITES:
dnl none
dnl IN:
dnl - default type for crosscompiling
dnl OUT:
dnl Variables:
dnl aq_endian
dnl Defines:
# check for type to use
AC_MSG_CHECKING(for endianness)
rm -f conf.endian
AC_TRY_RUN([
#include <stdlib.h>
#include <stdio.h>
int main (){
const char *s;
FILE *f;
union {
unsigned int i;
unsigned char c[4];
} u;
u.i=0x12345678;
if (u.c[0]==0x78)
s="little";
else
s="big";
f=fopen("conf.endian", "w+");
if (!f) {
printf("Could not create file conf.endian\n");
exit(1);
}
fprintf(f, "%s\n", s);
if (fclose(f)) {
printf("Could not close file.\n");
exit(1);
}
exit(0);
}
],
[aq_endian=`cat conf.endian`; AC_MSG_RESULT($aq_endian)],
[AC_MSG_ERROR(Could not determine endianness)],
[aq_endian="$1"; AC_MSG_RESULT([Crosscompiling, assuming $1])]
)
rm -f conf.endian
])
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