g++ 2.96 bug handling 'extern'.

[Mark Mitchell]

Sergei --

  Thanks for your bug report.  Fixed with this patch.
 
--
Mark Mitchell                   mark@codesourcery.com
CodeSourcery, LLC               http://www.codesourcery.com

2000-06-10  Mark Mitchell  <mark@codesourcery.com>

	* decl.c (add_binding): Handle duplicate declarations of external
	variables.

Index: cp/decl.c
===================================================================
RCS file: /cvs/gcc/egcs/gcc/cp/decl.c,v
retrieving revision 1.634
diff -c -p -r1.634 decl.c
*** decl.c	2000/06/09 21:47:40	1.634
--- decl.c	2000/06/11 04:06:46
*************** add_binding (id, decl)
*** 1032,1037 ****
--- 1032,1047 ----
  	 the name of any type declared in that scope to refer to the
  	 type to which it already refers.  */
      ok = 0;
+   /* There can be two block-scope declarations of the same variable,
+      so long as they are `extern' declarations.  */
+   else if (TREE_CODE (decl) == VAR_DECL
+ 	   && TREE_CODE (BINDING_VALUE (binding)) == VAR_DECL
+ 	   && DECL_EXTERNAL (decl)
+ 	   && DECL_EXTERNAL (BINDING_VALUE (binding)))
+     {
+       duplicate_decls (decl, BINDING_VALUE (binding));
+       ok = 0;
+     }
    else
      {
        cp_error ("declaration of `%#D'", decl);
Index: testsuite/g++.old-deja/g++.other/decl8.C
===================================================================
RCS file: decl8.C
diff -N decl8.C
*** /dev/null	Tue May  5 13:32:27 1998
--- decl8.C	Sat Jun 10 21:06:49 2000
***************
*** 0 ****
--- 1,10 ----
+ // Build don't link:
+ // Origin: Sergei Organov <osv@javad.ru>
+ 
+ void foo(void)
+ {
+   extern int i;    // ERROR - previous declaration
+   extern double i; // ERROR - conflicting type
+   extern int j;
+   extern int j;
+ }