Support again multiple --help options (PR other/90315).

2019-05-28  Martin Liska  <mliska@suse.cz>

	PR other/90315
	* opts-global.c (decode_options): Print help for all
	help_option_arguments.
	* opts.c (print_help): Add new argument.
	(common_handle_option): Remember all values into
	help_option_arguments.
	* opts.h (print_help): Add new argument.

From-SVN: r271700

gcc/ChangeLog

 2019-05-28  Martin Liska  <mliska@suse.cz>
 
+	PR other/90315
+	* opts-global.c (decode_options): Print help for all
+	help_option_arguments.
+	* opts.c (print_help): Add new argument.
+	(common_handle_option): Remember all values into
+	help_option_arguments.
+	* opts.h (print_help): Add new argument.
+
+2019-05-28  Martin Liska  <mliska@suse.cz>
+
 	PR ipa/90555
 	* ipa-icf-gimple.c (func_checker::compare_loops): New function.
 	* ipa-icf-gimple.h (func_checker::compare_loops): Likewise.

gcc/opts-global.c

@@ -317,8 +317,11 @@ decode_options (struct gcc_options *opts, struct gcc_options *opts_set,
   finish_options (opts, opts_set, loc);
 
   /* Print --help=* if used.  */
-  if (help_option_argument != NULL)
-    print_help (opts, lang_mask);
+  unsigned i;
+  const char *arg;
+
+  FOR_EACH_VEC_ELT (help_option_arguments, i, arg)
+    print_help (opts, lang_mask, arg);
 }
 
 /* Hold command-line options associated with stack limitation.  */

gcc/opts.c

@@ -856,7 +856,7 @@ control_options_for_live_patching (struct gcc_options *opts,
 }
 
 /* --help option argument if set.  */
-const char *help_option_argument = NULL;
+vec<const char *> help_option_arguments;
 
 
 /* After all options at LOC have been read into OPTS and OPTS_SET,
@@ -2062,7 +2062,8 @@ check_alignment_argument (location_t loc, const char *flag, const char *name)
 /* Print help when OPT__help_ is set.  */
 
 void
-print_help (struct gcc_options *opts, unsigned int lang_mask)
+print_help (struct gcc_options *opts, unsigned int lang_mask,
+	    const char *help_option_argument)
 {
   const char *a = help_option_argument;
   unsigned int include_flags = 0;
@@ -2255,7 +2256,7 @@ common_handle_option (struct gcc_options *opts,
 
     case OPT__help_:
       {
-	help_option_argument = arg;
+	help_option_arguments.safe_push (arg);
 	opts->x_exit_after_options = true;
 	break;
       }

gcc/opts.h

@@ -419,7 +419,8 @@ extern bool target_handle_option (struct gcc_options *opts,
 extern void finish_options (struct gcc_options *opts,
 			    struct gcc_options *opts_set,
 			    location_t loc);
-extern void print_help (struct gcc_options *opts, unsigned int lang_mask);
+extern void print_help (struct gcc_options *opts, unsigned int lang_mask, const
+			char *help_option_argument);
 extern void default_options_optimization (struct gcc_options *opts,
 					  struct gcc_options *opts_set,
 					  struct cl_decoded_option *decoded_options,
@@ -443,7 +444,7 @@ extern const struct sanitizer_opts_s
   bool can_recover;
 } sanitizer_opts[];
 
-extern const char *help_option_argument;
+extern vec<const char *> help_option_arguments;
 
 extern void add_misspelling_candidates (auto_vec<char *> *candidates,
 					const struct cl_option *option,