From 61cc919f73ea7ca134c0ac41b748981ad63a253b Mon Sep 17 00:00:00 2001 From: Mike Frysinger Date: Sun, 30 Jun 2013 23:30:18 -0400 Subject: [PATCH] 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 Reviewed-by: Richard Henderson Tested-by: James Hogan [mips] Message-id: 1372649418-4987-1-git-send-email-vapier@gentoo.org Signed-off-by: Anthony Liguori --- configure | 40 ++++++++++++++-------------------------- 1 file changed, 14 insertions(+), 26 deletions(-) diff --git a/configure b/configure index 91372f9d60..9addff190a 100755 --- a/configure +++ b/configure @@ -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 > $TMPC << EOF -#include -int main(void) { - volatile uint32_t i=0x01234567; - return (*((uint8_t*)(&i))) == 0x67; +short big_endian[] = { 0x4269, 0x4765, 0x4e64, 0x4961, 0x4e00, 0, }; +short little_endian[] = { 0x694c, 0x7454, 0x654c, 0x6e45, 0x6944, 0x6e41, 0, }; +extern int foo(short *, short *); +int main(int argc, char *argv[]) { + return foo(big_endian, little_endian); } EOF -if compile_prog "" "" ; then -$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 ##########################################