+/* Mapping for cpp message reasons to the options that enable them. */
+
+struct reason_option_codes_t
+{
+ const int reason; /* cpplib message reason. */
+ const int option_code; /* gcc option that controls this message. */
+};
+
+static const struct reason_option_codes_t option_codes[] = {
+ {CPP_W_DEPRECATED, OPT_Wdeprecated},
+ {CPP_W_COMMENTS, OPT_Wcomments},
+ {CPP_W_TRIGRAPHS, OPT_Wtrigraphs},
+ {CPP_W_MULTICHAR, OPT_Wmultichar},
+ {CPP_W_TRADITIONAL, OPT_Wtraditional},
+ {CPP_W_LONG_LONG, OPT_Wlong_long},
+ {CPP_W_ENDIF_LABELS, OPT_Wendif_labels},
+ {CPP_W_VARIADIC_MACROS, OPT_Wvariadic_macros},
+ {CPP_W_BUILTIN_MACRO_REDEFINED, OPT_Wbuiltin_macro_redefined},
+ {CPP_W_UNDEF, OPT_Wundef},
+ {CPP_W_UNUSED_MACROS, OPT_Wunused_macros},
+ {CPP_W_CXX_OPERATOR_NAMES, OPT_Wc___compat},
+ {CPP_W_NORMALIZE, OPT_Wnormalized_},
+ {CPP_W_INVALID_PCH, OPT_Winvalid_pch},
+ {CPP_W_WARNING_DIRECTIVE, OPT_Wcpp},
+ {CPP_W_NONE, 0}
+};
+
+/* Return the gcc option code associated with the reason for a cpp
+ message, or 0 if none. */
+
+static int
+c_option_controlling_cpp_error (int reason)
+{
+ const struct reason_option_codes_t *entry;
+
+ for (entry = option_codes; entry->reason != CPP_W_NONE; entry++)
+ {
+ if (entry->reason == reason)
+ return entry->option_code;
+ }
+ return 0;
+}
+