Provide proper error message for -flto=abcd.

2019-08-09  Martin Liska  <mliska@suse.cz>

	* opts.c (common_handle_option): Error for an invalid argument
	to -flto=.
2019-08-09  Martin Liska  <mliska@suse.cz>

	* gcc.dg/spellcheck-options-21.c: New test.

From-SVN: r274231

1 files changed, 8 insertions, 0 deletions

diff --git a/gcc/opts.c b/gcc/opts.c
index 28142ce..a0a7789 100644
--- a/gcc/opts.c
+++ b/gcc/opts.c
@@ -2822,6 +2822,14 @@ common_handle_option (struct gcc_options *opts,
       opts->x_flag_lto = value ? "" : NULL;
       break;
 
+    case OPT_flto_:
+      if (strcmp (arg, "none") != 0
+	  && strcmp (arg, "jobserver") != 0
+	  && atoi (arg) == 0)
+	error_at (loc,
+		  "unrecognized argument to %<-flto=%> option: %qs", arg);
+      break;
+
     case OPT_w:
       dc->dc_inhibit_warnings = true;
       break;