[PATCH] Fix detection for the need of alignment

[Laurent Desnogues]

Hello,

this patch fixes the detection for the need of alignment:

  * handle big- vs little-endian
  * fix initialization of buffer
  * correctly read the buffer.

I'm well aware the NEED_ALIGN macro isn't used (yet?).

HTH,

Laurent

diff --git a/configure.ac b/configure.ac
index f9094a2..d1a0ea0 100644
--- a/configure.ac
+++ b/configure.ac
@@ -402,9 +402,13 @@ AC_DEFUN([AC_C_ALIGNMENT],
        *ptr = 0x1;
 
        // catch unaligned word access (ARM cpus)
-       *buf =  1; *(buf +1) = 2; *(buf + 2) = 2; *(buf + 3) = 3; *(buf + 4) = 4;
-       int* i = (int*)(buf+1);
-       return (84148994 == i) ? 0 : 1;
+       *buf =  1; *(buf +1) = 2; *(buf + 2) = 3; *(buf + 3) = 4; *(buf + 4) = 5;
+       int i = *(int*)(buf+1);
+#ifdef ENDIAN_LITTLE
+       return (0x5040302 == i) ? 0 : 1;
+#else
+       return (0x2030405 == i) ? 0 : 1;
+#endif
     ])
   ],[
     ac_cv_c_alignment=none