Commit 61cc919f authored by Mike Frysinger's avatar Mike Frysinger Committed by Anthony Liguori
Browse files

configure: detect endian via compile test 



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

Signed-off-by: default avatarMike Frysinger <vapier@gentoo.org>
Reviewed-by: default avatarRichard 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: default avatarAnthony Liguori <aliguori@amazon.com>
parent 8aa15b6e

configure

+14 −26
Original line number Diff line number Diff line
@@ -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"

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



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

    fi

  ;;

  hppa|m68k|mips|mips64|ppc|ppc64|s390|s390x|sparc|sparc64)

    bigendian=yes

  ;;

esac



    echo big/little test failed

fi



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