PR c++/20293

[pf3gnuchains/gcc-fork.git] / gcc / c-decl.c

diff --git a/gcc/c-decl.c b/gcc/c-decl.c
index 9c2e829..003b813 100644 (file)
--- a/gcc/c-decl.c
+++ b/gcc/c-decl.c
@@ -803,6 +803,7 @@ pop_scope (void)
        case VAR_DECL:
          /* Warnings for unused variables.  */
          if (!TREE_USED (p)
+             && !TREE_NO_WARNING (p)
              && !DECL_IN_SYSTEM_HEADER (p)
              && DECL_NAME (p)
              && !DECL_ARTIFICIAL (p)
@@ -1876,7 +1877,11 @@ duplicate_decls (tree newdecl, tree olddecl)
   tree newtype = NULL, oldtype = NULL;
 
   if (!diagnose_mismatched_decls (newdecl, olddecl, &newtype, &oldtype))
-    return false;
+    {
+      /* Avoid `unused variable' and other warnings warnings for OLDDECL.  */
+      TREE_NO_WARNING (olddecl) = 1;
+      return false;
+    }
 
   merge_decls (newdecl, olddecl, newtype, oldtype);
   return true;
@@ -3426,8 +3431,6 @@ finish_decl (tree decl, tree init, tree asmspec_tree)
              && !TREE_STATIC (decl))
            warning (0, "ignoring asm-specifier for non-static local "
                     "variable %q+D", decl);
-         else if (C_DECL_REGISTER (decl))
-           change_decl_assembler_name (decl, get_identifier (asmspec));
          else
            set_user_assembler_name (decl, asmspec);
        }
@@ -4250,16 +4253,19 @@ grokdeclarator (const struct c_declarator *declarator,
            else
              type = build_array_type (type, itype);
 
-           if (size_varies)
-             C_TYPE_VARIABLE_SIZE (type) = 1;
-
-           /* The GCC extension for zero-length arrays differs from
-              ISO flexible array members in that sizeof yields
-              zero.  */
-           if (size && integer_zerop (size))
+           if (type != error_mark_node)
              {
-               TYPE_SIZE (type) = bitsize_zero_node;
-               TYPE_SIZE_UNIT (type) = size_zero_node;
+               if (size_varies)
+               C_TYPE_VARIABLE_SIZE (type) = 1;
+
+               /* The GCC extension for zero-length arrays differs from
+                  ISO flexible array members in that sizeof yields
+                  zero.  */
+               if (size && integer_zerop (size))
+                 {
+                   TYPE_SIZE (type) = bitsize_zero_node;
+                   TYPE_SIZE_UNIT (type) = size_zero_node;
+                 }
              }
 
            if (decl_context != PARM
@@ -4688,11 +4694,10 @@ grokdeclarator (const struct c_declarator *declarator,
        /* At file scope, the presence of a `static' or `register' storage
           class specifier, or the absence of all storage class specifiers
           makes this declaration a definition (perhaps tentative).  Also,
-          the absence of both `static' and `register' makes it public.  */
+          the absence of `static' makes it public.  */
        if (current_scope == file_scope)
          {
-           TREE_PUBLIC (decl) = !(storage_class == csc_static
-                                  || storage_class == csc_register);
+           TREE_PUBLIC (decl) = storage_class != csc_static;
            TREE_STATIC (decl) = !extern_ref;
          }
        /* Not at file scope, only `static' makes a static definition.  */