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configure: detect endian via compile test 

This avoids needing to execute a program and keeping an (incomplete)
list when cross-compiling.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Reviewed-by: Richard Henderson <rth@twiddle.net>
Tested-by: James Hogan <james.hogan@imgtec.com> [mips]
Message-id: 1372649418-4987-1-git-send-email-vapier@gentoo.org
Signed-off-by: Anthony Liguori <aliguori@amazon.com>
This commit is contained in:
Mike Frysinger 2013-06-30 23:30:18 -04:00 committed by Anthony Liguori
parent 8aa15b6e52
commit 61cc919f73
1 changed files with 14 additions and 26 deletions
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40
configure vendored
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@ -1433,39 +1433,27 @@ feature_not_found() {
"configure was not able to find it"
}
if test -z "$cross_prefix" ; then
# ---
# big/little endian test
cat > $TMPC << EOF
#include <inttypes.h>
int main(void) {
volatile uint32_t i=0x01234567;
return (*((uint8_t*)(&i))) == 0x67;
short big_endian[] = { 0x4269, 0x4765, 0x4e64, 0x4961, 0x4e00, 0, };
short little_endian[] = { 0x694c, 0x7454, 0x654c, 0x6e45, 0x6944, 0x6e41, 0, };
extern int foo(short *, short *);
int main(int argc, char *argv[]) {
return foo(big_endian, little_endian);
}
EOF
if compile_prog "" "" ; then
$TMPE && bigendian="yes"
else
echo big/little test failed
fi
else
# if cross compiling, cannot launch a program, so make a static guess
case "$cpu" in
arm)
# ARM can be either way; ask the compiler which one we are
if check_define __ARMEB__; then
bigendian=yes
if compile_object ; then
if grep -q BiGeNdIaN $TMPO ; then
bigendian="yes"
elif grep -q LiTtLeEnDiAn $TMPO ; then
bigendian="no"
else
echo big/little test failed
fi
;;
hppa|m68k|mips|mips64|ppc|ppc64|s390|s390x|sparc|sparc64)
bigendian=yes
;;
esac
else
echo big/little test failed
fi
##########################################