incompatibility between binutils and bison 1.50

[Jeremy Buhler]

I attempted to build binutils 2.13.90.0.10 (updated from development
tree 20021010) on a Linux system using the latest released version of
bison, v1.50.  The build failed at ld/ldgram.y due to the new bison's
stricter checking of rule types.  In particular, if a rule has an
internal action but no final action, then the type of the default
action {$$ = $1} is checked, whereas it was ignored in previous
versions of bison.

The attached patch adds empty default rules in the two places that
cause compile errors with bison 1.50.

                                                         Jeremy

diff -uwr binutils-2.13.90.0.10-old/ld/ldgram.y 
binutils-2.13.90.0.10/ld/ldgram.y
--- binutils-2.13.90.0.10-old/ld/ldgram.y       2002-05-23 17:10:11.000000000 
-0500
+++ binutils-2.13.90.0.10/ld/ldgram.y   2002-10-12 22:15:57.000000000 -0500
@@ -629,8 +629,7 @@
 memory_spec:           NAME
                        { region = lang_memory_region_lookup($1); }
                attributes_opt ':'
-               origin_spec opt_comma length_spec
-
+               origin_spec opt_comma length_spec {}
        ;

 origin_spec:
@@ -844,7 +843,7 @@
                  ldlex_popstate ();
                  lang_leave_output_section_statement ($14, $11, $13, $12);
                }
-               opt_comma
+                opt_comma {}
        |       OVERLAY
                        { ldlex_expression (); }
                opt_exp_without_type opt_nocrossrefs opt_at