From 68d81080b3cbf1c53c3a2f2174d813da5629fab7 Mon Sep 17 00:00:00 2001
From: Xavier Roche <xroche@users.noreply.github.com>
Date: Mon, 23 Jun 2014 18:52:33 +0000
Subject: Check for aligned access requirements explicitly.

---
 config.h.in  |  3 +++
 configure    | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++
 configure.ac |  3 +++
 src/coucal.c |  2 +-
 4 files changed, 58 insertions(+), 1 deletion(-)

diff --git a/config.h.in b/config.h.in
index c146b78..af17a1b 100644
--- a/config.h.in
+++ b/config.h.in
@@ -6,6 +6,9 @@
 /* Check for ftime */
 #undef FTIME
 
+/* Define if pointers to integers require aligned access */
+#undef HAVE_ALIGNED_ACCESS_REQUIRED
+
 /* Define to 1 if you have the <dlfcn.h> header file. */
 #undef HAVE_DLFCN_H
 
diff --git a/configure b/configure
index 82eec3b..3c78a5f 100755
--- a/configure
+++ b/configure
@@ -12456,6 +12456,57 @@ $as_echo "#define sa_family_t uint16_t" >>confdefs.h
 fi
 
 
+# check wether misaligned access is possible or not
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking if pointers to integers require aligned access" >&5
+$as_echo_n "checking if pointers to integers require aligned access... " >&6; }
+if ${ax_cv_have_aligned_access_required+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  if test "$cross_compiling" = yes; then :
+  ax_cv_have_aligned_access_required=no
+else
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+int main()
+{
+  char* string = malloc(40);
+  int i;
+  for (i=0; i < 40; i++) string[[i]] = i;
+  {
+     void* s = string;
+     int* p = s+1;
+     int* q = s+2;
+
+     if (*p == *q) { return 1; }
+  }
+  return 0;
+}
+
+_ACEOF
+if ac_fn_c_try_run "$LINENO"; then :
+  ax_cv_have_aligned_access_required=yes
+else
+  ax_cv_have_aligned_access_required=no
+fi
+rm -f core *.core core.conftest.* gmon.out bb.out conftest$ac_exeext \
+  conftest.$ac_objext conftest.beam conftest.$ac_ext
+fi
+
+
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ax_cv_have_aligned_access_required" >&5
+$as_echo "$ax_cv_have_aligned_access_required" >&6; }
+if test "$ax_cv_have_aligned_access_required" = yes ; then
+
+$as_echo "#define HAVE_ALIGNED_ACCESS_REQUIRED 1" >>confdefs.h
+
+fi
+
+
 ### zlib
 #
 # Handle user hints
diff --git a/configure.ac b/configure.ac
index 58bae04..cb55b6c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -113,6 +113,9 @@ AC_CHECK_TYPE(sa_family_t, [], [AC_DEFINE([sa_family_t], [uint16_t], [sa_family_
 #include <netinet/in.h>
 ])
 
+# check wether misaligned access is possible or not
+AX_CHECK_ALIGNED_ACCESS_REQUIRED
+
 ### zlib
 CHECK_ZLIB()
 
diff --git a/src/coucal.c b/src/coucal.c
index d4ab9e4..b1d6de9 100644
--- a/src/coucal.c
+++ b/src/coucal.c
@@ -59,7 +59,7 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 #if (!defined(HTS_INTHASH_USES_MD5) && !defined(HTS_INTHASH_USES_MURMUR))
 /* Temporry: fixing Invalid address alignment issues */
-#if defined(__ANDROID__)
+#if (defined(__ANDROID__) || defined(HAVE_ALIGNED_ACCESS_REQUIRED))
 #define HTS_INTHASH_USES_MD5 1
 #else
 #define HTS_INTHASH_USES_MURMUR 1
-- 
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