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, 14 insertions, 0 deletions

diff --git a/gcc/params.c b/gcc/params.c
index 41660b4..1b5000b 100644
--- a/gcc/params.c
+++ b/gcc/params.c
@@ -25,6 +25,7 @@ along with GCC; see the file COPYING3.  If not see
 #include "params.h"
 #include "params-enum.h"
 #include "diagnostic-core.h"
+#include "spellcheck.h"
 
 /* An array containing the compiler parameters and their current
    values.  */
@@ -142,6 +143,19 @@ find_param (const char *name, enum compiler_param *index)
   return false;
 }
 
+/* Look for the closest match for NAME in the parameter table, returning it
+   if it is a reasonable suggestion for a misspelling.  Return NULL
+   otherwise.  */
+
+const char *
+find_param_fuzzy (const char *name)
+{
+  best_match <const char *, const char *> bm (name);
+  for (size_t i = 0; i < num_compiler_params; ++i)
+    bm.consider (compiler_params[i].option);
+  return bm.get_best_meaningful_candidate ();
+}
+
 /* Return true if param with entry index INDEX should be defined using strings.
    If so, return the value corresponding to VALUE_NAME in *VALUE_P.  */