Gcc v2.6.3 currently has a problem with templates. Specifically, with

default switches, template functions get EXTERNAL linkage in each file
in which they occur, causing multiple definition errors during
linking.  The enclosed patch (from gnu.g++.bug) appears to solve the
problem (I enclose the accompanying message as well).

This patch fixes the multiply defined template functions bug
which was introduced in 2.6.1.

Submitted by:	"Justin T. Gibbs" <gibbs@estienne.cs.berkeley.edu>
Obtained from:  Jason Merrill at cygnus support on G++ mailing list

gnu/usr.bin/cc/cc1plus/pt.c

@@ -2302,6 +2302,10 @@ do_pending_expansions ()
       else if (! flag_implicit_templates)
 	DECIDE (0);
 
+      if (i->interface == 1)
+        /* OK, it was an implicit instantiation.  */
+        TREE_PUBLIC (t) = 0;
+
       /* If it's a method, let the class type decide it.
 	 @@ What if the method template is in a separate file?
 	 Maybe both file contexts should be taken into account?