[Qemu-devel] [PATCH][v2] configure: change endianness test

[Stuart Yoder]

From: Stuart Yoder <address@hidden>

Remove the runtime check for endianness, and for platforms
that can be bit or little endian do a compile time check.

This resolves an issue encountered building QEMU
under Yocto which was not setting --cross-prefix.

Signed-off-by: Stuart Yoder <address@hidden>
---

-v2: removed the dynamic runtime test completely,
     added compile time check for mips

 configure |   33 ++++++++-------------------------
 1 files changed, 8 insertions(+), 25 deletions(-)

diff --git a/configure b/configure
index fe4fc4f..d9c5999 100755
--- a/configure
+++ b/configure
@@ -1269,41 +1269,24 @@ feature_not_found() {
   exit 1;
 }
 
-if test -z "$cross_prefix" ; then
-
-# ---
-# big/little endian test
-cat > $TMPC << EOF
-#include <inttypes.h>
-int main(int argc, char ** argv){
-        volatile uint32_t i=0x01234567;
-        return (*((uint8_t*)(&i))) == 0x67;
-}
-EOF
-
-if compile_prog "" "" ; then
-$TMPE && bigendian="yes"
-else
-echo big/little test failed
-fi
-
-else
-
-# if cross compiling, cannot launch a program, so make a static guess
+##########################################
+# endianness check
 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)
+  mips|mips64)
+    if check_define __MIPSEB__; then
+      bigendian=yes
+    fi
+  ;;
+  hppa|m68k|ppc|ppc64|s390|s390x|sparc|sparc64)
     bigendian=yes
   ;;
 esac
 
-fi
-
 ##########################################
 # NPTL probe
 
-- 
1.7.3.4