* c-common.c (decl_attributes): Allow applying attribute `unused'

        on a LABEL_DECL.
        * c-parse.in (label): Parse attributes after a label, and call
        `decl_attributes' to handle them.
        * gansidecl.h (ATTRIBUTE_UNUSED_LABEL): Define.
        * genrecog.c (OUTPUT_LABEL, write_tree_1, write_tree): When
        generating labels, mark them with ATTRIBUTE_UNUSED_LABEL.
        * invoke.texi: Note that labels can be marked `unused'.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@24478 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 5 insertions, 2 deletions

diff --git a/gcc/c-parse.in b/gcc/c-parse.in
index c0bf10798ee..5536e64bf32 100644
--- a/gcc/c-parse.in
+++ b/gcc/c-parse.in
@@ -2214,12 +2214,15 @@ label:	  CASE expr_no_commas ':'
 		      error_with_decl (duplicate, "this is the first default label");
 		    }
 		  position_after_white_space (); }
-	| identifier ':'
+	| identifier ':' maybe_attribute
 		{ tree label = define_label (input_filename, lineno, $1);
 		  stmt_count++;
 		  emit_nop ();
 		  if (label)
-		    expand_label (label);
+		    {
+		      expand_label (label);
+		      decl_attributes (label, $3, NULL_TREE);
+		    }
 		  position_after_white_space (); }
 	;