suppress GCC warning about unknown sanitizers

See also: https://travis-ci.org/ruby/ruby/jobs/451710726#L1941


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@65590 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

gc.c

@@ -4164,11 +4164,9 @@ ruby_stack_check(void)
     return stack_check(GET_EC(), STACKFRAME_FOR_CALL_CFUNC);
 }
 
-ATTRIBUTE_NO_ADDRESS_SAFETY_ANALYSIS
-(
+ATTRIBUTE_NO_ADDRESS_SAFETY_ANALYSIS(static void mark_locations_array(rb_objspace_t *objspace, register const VALUE *x, register long n));
 static void
 mark_locations_array(rb_objspace_t *objspace, register const VALUE *x, register long n)
-)
 {
     VALUE v;
     while (n--) {

internal.h

@@ -68,6 +68,16 @@ extern "C" {
 # define ATTRIBUTE_NO_ADDRESS_SAFETY_ANALYSIS(x) x
 #endif
 
+#if defined(NO_SANITIZE) && defined(__GNUC__) &&! defined(__clang__)
+/* GCC warns about unknown sanitizer, which is annoying. */
+#undef NO_SANITIZE
+#define NO_SANITIZE(x, y) \
+    COMPILER_WARNING_PUSH; \
+    COMPILER_WARNING_IGNORED(-Wattributes); \
+    __attribute__((__no_sanitize__(x))) y; \
+    COMPILER_WARNING_POP
+#endif
+
 #ifndef NO_SANITIZE
 # define NO_SANITIZE(x, y) y
 #endif