From: Niko Tyni <ntyni@debian.org>
Subject: Prevent gcc from optimizing the alignment test away on armel
Bug-Debian: http://bugs.debian.org/289884
Author: Marc Pignat <marc.pignat@hevs.ch>
Origin: upstream, http://perl5.git.perl.org/perl.git/commit/f1c7503b9028d20741c9a01345ba8704998ea381

As hunted down by Marc Pignat, gcc optimizations make the check for
u32align (U32_ALIGNMENT_REQUIRED) a no-op on armel, breaking the MD5
module.

---
 Configure |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/Configure b/Configure
index 01fa3c0..f39b2f9 100755
--- a/Configure
+++ b/Configure
@@ -18533,6 +18533,7 @@ $cat <<EOM
 
 Checking to see whether you can access character data unalignedly...
 EOM
+: volatile so that the compiler does not optimize the test away
 case "$d_u32align" in
 '')   $cat >try.c <<EOCP
 #include <stdio.h>
@@ -18549,8 +18550,8 @@ $signal_t bletch(int s) { exit(4); }
 #endif
 int main() {
 #if BYTEORDER == 0x1234 || BYTEORDER == 0x4321
-    U8 buf[8];
-    U32 *up;
+    $volatile U8 buf[8];
+    $volatile U32 *up;
     int i;
 
     if (sizeof(U32) != 4) {
-- 
tg: (daf8b46..) fixes/arm-alignment (depends on: upstream)