re PR c/53063 (encode group options in the .opt files)

2012-10-16  Manuel López-Ibáñez  <manu@gcc.gnu.org>

	PR c/53063
	PR c/40989
	* doc/options.texi (EnabledBy): Document new form.
	* optc-gen.awk: Handle new form of EnabledBy.
	* common.opt (Wunused-but-set-parameter): Use EnabledBy.
	(Wunused-parameter): Likewise.
	* opts.c (finish_options): Do not handle them explicitly.
	* opt-functions.awk (search_var_name): New.

From-SVN: r192503

1 files changed, 16 insertions, 0 deletions

diff --git a/gcc/opt-functions.awk b/gcc/opt-functions.awk
index 8b025b2cf32..13de5e48ed1 100644
--- a/gcc/opt-functions.awk
+++ b/gcc/opt-functions.awk
@@ -297,3 +297,19 @@ function lang_sanitized_name(name)
     gsub( "[^" alnum "_]", "X", name )
     return name
 }
+
+# Search for a valid var_name among all OPTS equal to option NAME.
+# If not found, return "".
+function search_var_name(name, opt_numbers, opts, flags, n_opts)
+{
+    opt_var_name = var_name(flags[opt_numbers[name]]);
+    if (opt_var_name != "") {
+        return opt_var_name;
+    }
+    for (k = 0; k < n_opts; k++) {
+        if (opts[k] == name && var_name(flags[k]) != "") {
+            return var_name(flags[k]);
+        }
+    }
+    return ""
+}