@@ -157,18 +157,22 @@
 AX_CHECK_COMPILER_FLAGS(-fno-common, [OBJCFLAGS="$OBJCFLAGS -fno-common"])
 AX_CHECK_COMPILER_FLAGS(-fno-constant-cfstrings, [
 	OBJCFLAGS="$OBJCFLAGS -fno-constant-cfstrings"
 	AC_SUBST(NO_CONST_CFSTRINGS, "-fno-constant-cfstrings")
 ])
+AX_CHECK_COMPILER_FLAGS(-Wsign-compare -Werror,
+	[OBJCFLAGS="$OBJCFLAGS -Wsign-compare"])
 AX_CHECK_COMPILER_FLAGS(-Wshorten-64-to-32 -Werror,
 	[OBJCFLAGS="$OBJCFLAGS -Wshorten-64-to-32"])
 AX_CHECK_COMPILER_FLAGS(-Wsemicolon-before-method-body -Werror,
 	[OBJCFLAGS="$OBJCFLAGS -Wsemicolon-before-method-body"])
 AX_CHECK_COMPILER_FLAGS(-Wobjc-missing-property-synthesis -Werror,
 	[OBJCFLAGS="$OBJCFLAGS -Wobjc-missing-property-synthesis"])
-AX_CHECK_COMPILER_FLAGS(-Wsign-compare -Werror,
-	[OBJCFLAGS="$OBJCFLAGS -Wsign-compare"])
+AX_CHECK_COMPILER_FLAGS(-Watomic-properties -Werror, [
+	OBJCFLAGS="$OBJCFLAGS -Watomic-properties"
+	TESTS_OBJCFLAGS="$TESTS_OBJCFLAGS -Wno-atomic-properties"
+])
 
 AC_MSG_CHECKING(whether Objective C compiler supports properties)
 AC_TRY_COMPILE([
 	@interface Foo
 	{
@@ -1469,10 +1473,11 @@
 dnl We use the ObjC compiler as our assembler
 AC_SUBST(AS, $OBJC)
 AC_SUBST(ASFLAGS)
 AC_SUBST(AS_DEPENDS, '${OBJC_DEPENDS}')
 
+AC_SUBST(TESTS_OBJCFLAGS)
 AC_SUBST(TESTS_LIBS)
 
 AC_CONFIG_FILES([
 	buildsys.mk
 	extra.mk