+/* Default version of get_pch_validity.
+ By default, every flag difference is fatal; that will be mostly right for
+ most targets, but completely right for very few. */
+
+void *
+default_get_pch_validity (size_t *sz)
+{
+ struct cl_option_state state;
+ size_t i;
+ char *result, *r;
+
+ *sz = 2;
+ if (targetm.check_pch_target_flags)
+ *sz += sizeof (target_flags);
+ for (i = 0; i < cl_options_count; i++)
+ if (option_affects_pch_p (i, &state))
+ *sz += state.size;
+
+ result = r = XNEWVEC (char, *sz);
+ r[0] = flag_pic;
+ r[1] = flag_pie;
+ r += 2;
+ if (targetm.check_pch_target_flags)
+ {
+ memcpy (r, &target_flags, sizeof (target_flags));
+ r += sizeof (target_flags);
+ }
+
+ for (i = 0; i < cl_options_count; i++)
+ if (option_affects_pch_p (i, &state))
+ {
+ memcpy (r, state.data, state.size);
+ r += state.size;
+ }
+
+ return result;
+}
+
+/* Return a message which says that a PCH file was created with a different
+ setting of OPTION. */
+
+static const char *
+pch_option_mismatch (const char *option)
+{
+ char *r;
+
+ asprintf (&r, _("created and used with differing settings of '%s'"), option);
+ if (r == NULL)
+ return _("out of memory");
+ return r;
+}
+
+/* Default version of pch_valid_p. */
+
+const char *
+default_pch_valid_p (const void *data_p, size_t len)
+{
+ struct cl_option_state state;
+ const char *data = (const char *)data_p;
+ size_t i;
+
+ /* -fpic and -fpie also usually make a PCH invalid. */
+ if (data[0] != flag_pic)
+ return _("created and used with different settings of -fpic");
+ if (data[1] != flag_pie)
+ return _("created and used with different settings of -fpie");
+ data += 2;
+
+ /* Check target_flags. */
+ if (targetm.check_pch_target_flags)
+ {
+ int tf;
+ const char *r;
+
+ memcpy (&tf, data, sizeof (target_flags));
+ data += sizeof (target_flags);
+ len -= sizeof (target_flags);
+ r = targetm.check_pch_target_flags (tf);
+ if (r != NULL)
+ return r;
+ }
+
+ for (i = 0; i < cl_options_count; i++)
+ if (option_affects_pch_p (i, &state))
+ {
+ if (memcmp (data, state.data, state.size) != 0)
+ return pch_option_mismatch (cl_options[i].opt_text);
+ data += state.size;
+ len -= state.size;
+ }
+
+ return NULL;
+}
+
+/* Default version of TARGET_HANDLE_OPTION. */
+
+bool
+default_target_handle_option (struct gcc_options *opts ATTRIBUTE_UNUSED,
+ struct gcc_options *opts_set ATTRIBUTE_UNUSED,
+ const struct cl_decoded_option *decoded ATTRIBUTE_UNUSED,
+ location_t loc ATTRIBUTE_UNUSED)
+{
+ return true;
+}
+
+const struct default_options empty_optimization_table[] =
+ {
+ { OPT_LEVELS_NONE, 0, NULL, 0 }
+ };
+