re PR other/28322 (GCC new warnings and compatibility)

2008-02-26  Manuel Lopez-Ibanez  <manu@gcc.gnu.org>

	PR 28322
	* toplev.c (toplev_main): If there are warnings or error, print
	errors for ignored options.
	* opts.c (ignored_options): New static variable.
	(postpone_unknown_option_error): New.
	(print_ignored_options): New.
	(handle_option): Postpone errors for unknown -Wno-* options.
	* opts.h (print_ignored_options): Declare.
testsuite/
	* gcc.dg/pr28322.c: New.
	* gcc.dg/pr28322-2.c: New.
	* lib/prune.exp: Ignore "At top level" even if there is no ':'
	preceding it.

From-SVN: r132648

1 files changed, 41 insertions, 0 deletions

diff --git a/gcc/opts.c b/gcc/opts.c
index 8b8a1a9..8bee44b 100644
--- a/gcc/opts.c
+++ b/gcc/opts.c
@@ -365,6 +365,12 @@ DEF_VEC_ALLOC_P(char_p,heap);
 static VEC(char_p,heap) *flag_instrument_functions_exclude_functions;
 static VEC(char_p,heap) *flag_instrument_functions_exclude_files;
 
+typedef const char *const_char_p; /* For DEF_VEC_P.  */
+DEF_VEC_P(const_char_p);
+DEF_VEC_ALLOC_P(const_char_p,heap);
+
+static VEC(const_char_p,heap) *ignored_options;
+
 /* Input file names.  */
 const char **in_fnames;
 unsigned num_in_fnames;
@@ -443,6 +449,33 @@ complain_wrong_lang (const char *text, const struct cl_option *option,
   free (bad_lang);
 }
 
+/* Buffer the unknown option described by the string OPT.  Currently,
+   we only complain about unknown -Wno-* options if they may have
+   prevented a diagnostic. Otherwise, we just ignore them.  */
+
+static void postpone_unknown_option_error(const char *opt)
+{
+  VEC_safe_push (const_char_p, heap, ignored_options, opt);
+}
+
+/* Produce an error for each option previously buffered.  */
+
+void print_ignored_options (void)
+{
+  location_t saved_loc = input_location;
+
+  input_location = 0;
+
+  while (!VEC_empty (const_char_p, ignored_options))
+    {
+      const char *opt;
+      opt = VEC_pop (const_char_p, ignored_options);
+      error ("unrecognized command line option \"%s\"", opt);
+    }
+
+  input_location = saved_loc;
+}
+
 /* Handle the switch beginning at ARGV for the language indicated by
    LANG_MASK.  Returns the number of switches consumed.  */
 static unsigned int
@@ -472,6 +505,14 @@ handle_option (const char **argv, unsigned int lang_mask)
       opt = dup;
       value = 0;
       opt_index = find_opt (opt + 1, lang_mask | CL_COMMON | CL_TARGET);
+      if (opt_index == cl_options_count)
+	{
+	  /* We don't generate errors for unknown -Wno-* options
+             unless we issue diagnostics.  */
+	  postpone_unknown_option_error (argv[0]);
+	  result = 1;
+	  goto done;
+	}
     }
 
   if (opt_index == cl_options_count)