Get __STRICT_ALIGNMENT from machine/endian.h

configure.ac

@@ -75,18 +75,6 @@ AC_ARG_ENABLE([tests],
        [enable_tests="yes"])
 AM_CONDITIONAL([ENABLE_TESTS], [test "x$enable_tests" = xyes])
 
-# Add CPU-specific alignment flags
-old_cflags=$CFLAGS
-CFLAGS="$CFLAGS -I$srcdir/include"
-AC_MSG_CHECKING([if BSWAP4 builds without __STRICT_ALIGNMENT])
-AC_TRY_COMPILE([#include "$srcdir/crypto/modes/modes_lcl.h"],
-	       [int a = 0; BSWAP4(a);],
-	       AC_MSG_RESULT([yes])
-	       BSWAP4=yes,
-	       AC_MSG_RESULT([no])
-	       BSWAP4=no)
-CFLAGS="$old_cflags"
-
 AS_CASE([$host_cpu],
 	[*sparc*], [CPPFLAGS="$CPPFLAGS -D__STRICT_ALIGNMENT"],
 	[*arm*], [host_cpu=arm],
@@ -94,7 +82,6 @@ AS_CASE([$host_cpu],
 	[i?86], [HOSTARCH=intel],
 	[x86_64], [HOSTARCH=intel]
 )
-AS_IF([test "x$BSWAP4" = "xyes" -a "$host_cpu" = "arm" ],,CPPFLAGS="$CPPFLAGS -D__STRICT_ALIGNMENT")
 AM_CONDITIONAL([HOST_CPU_IS_INTEL], [test "x$HOSTARCH" = "xintel"])
 
 AC_MSG_CHECKING([if .gnu.warning accepts long strings])

include/compat/machine/endian.h

@@ -37,4 +37,14 @@
 
 #endif
 
+#ifndef __STRICT_ALIGNMENT
+#define __STRICT_ALIGNMENT
+#if defined(__i386)    || defined(__i386__)    || \
+    defined(__x86_64)  || defined(__x86_64__)  || \
+    defined(__aarch64__)                       || \
+    ((defined(__arm__) || defined(__arm)) && __ARM_ARCH >= 6)
+#undef __STRICT_ALIGNMENT
+#endif
+#endif
+
 #endif