From 8695b506884a06f1262986118e7067127278b3ae Mon Sep 17 00:00:00 2001
From: Brent Cook <busterb@gmail.com>
Date: Sun, 1 Mar 2015 15:57:21 -0600
Subject: check if the BSWAP assembly for ARM works before building

---
 configure.ac | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/configure.ac b/configure.ac
index 81433c8..8f174ad 100644
--- a/configure.ac
+++ b/configure.ac
@@ -57,6 +57,14 @@ case $host_cpu in
 	*sparc*)
 		CFLAGS="$CFLAGS -D__STRICT_ALIGNMENT"
 		;;
+	*arm*)
+		old_cflags=$CFLAGS
+		CFLAGS="$old_cflags -I$srcdir/include"
+		AC_TRY_COMPILE([#include "$srcdir/crypto/modes/modes_lcl.h"],
+			       [int a = 0; BSWAP4(a);],
+			       CFLAGS="$old_cflags",
+			       CFLAGS="$old_cflags -D__STRICT_ALIGNMENT")
+		;;
 esac
 
 AM_CONDITIONAL([HOST_DARWIN],  [test x$HOST_OS = xdarwin])
-- 
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