Offer suggestions for misspelled --param names.

gcc/ChangeLog:
	* opts.c (handle_param): Use find_param_fuzzy to offer suggestions
	for misspelled param names.
	* params.c: Include spellcheck.h.
	(find_param_fuzzy): New function.
	* params.h (find_param_fuzzy): New prototype.
	* spellcheck.c (struct edit_distance_traits<const char *>): Move
	to...
	* spellcheck.h (struct edit_distance_traits<const char *>):
	...here.

gcc/testsuite/ChangeLog:
	* gcc.dg/spellcheck-params.c: New testcase.
	* gcc.dg/spellcheck-params-2.c: New testcase.

From-SVN: r237865

1 files changed, 8 insertions, 1 deletions

diff --git a/gcc/opts.c b/gcc/opts.c
index 7406210..f09c520 100644
--- a/gcc/opts.c
+++ b/gcc/opts.c
@@ -2228,7 +2228,14 @@ handle_param (struct gcc_options *opts, struct gcc_options *opts_set,
 
       enum compiler_param index;
       if (!find_param (arg, &index))
-	error_at (loc, "invalid --param name %qs", arg);
+	{
+	  const char *suggestion = find_param_fuzzy (arg);
+	  if (suggestion)
+	    error_at (loc, "invalid --param name %qs; did you mean %qs?",
+		      arg, suggestion);
+	  else
+	    error_at (loc, "invalid --param name %qs", arg);
+	}
       else
 	{
 	  if (!param_string_value_p (index, equal + 1, &value))