-more datacache integration work

[oweals/gnunet.git] / m4 / align.m4

diff --git a/m4/align.m4 b/m4/align.m4
index 256300e377902d73a789348b63eae0bf6045ce8e..25e1ee2d489ac3ed5035197c8f93695a666b4187 100644 (file)
--- a/m4/align.m4
+++ b/m4/align.m4
@@ -13,12 +13,16 @@ AC_DEFUN([AC_UNALIGNED_64_ACCESS],
 [AC_CACHE_CHECK([whether unaligned 64-bit access works],
  ac_cv_unaligned_64_access, 
  [
- AC_RUN_IFELSE(AC_LANG_PROGRAM([[struct S { int a,b,c;};]],
-                               [[struct S s = {0,0,0}; long long * p = &s.b; 
-                                 long long x = *p; return (int) x*x;]]),
+ AC_RUN_IFELSE([AC_LANG_PROGRAM([[struct S { int a,b,c;};]],
+                               [[struct S s = {0,0,0}; long long * p = (long long *) &s.b; 
+                                void *bp = malloc (50); 
+                                long long x = *p; 
+                                long long *be = (long long*) &bp[1];
+                                long long y = *be;
+                                return (int) x*y;]]),
  ac_cv_unaligned_64_access=yes,
  ac_cv_unaligned_64_access=no,
- ac_cv_unaligned_64_access=no)
+ ac_cv_unaligned_64_access=no])
  ])
  case "$ac_cv_unaligned_64_access" in
   *yes) value=1;;