re PR c++/27640 (segfault, related to constructor instantiation and virtual base…

re PR c++/27640 (segfault, related to constructor instantiation and virtual base case and templates and new operator)

	PR c++/27640
	* pt.c (instantiate_template): Set processing_template_decl to
	zero while performing substitutions.
	PR c++/27640
	* g++.dg/template/ctor7.C: New test.

From-SVN: r114701

gcc/cp/ChangeLog

+2006-06-15  Mark Mitchell  <mark@codesourcery.com>
+
+	PR c++/27640
+	* pt.c (instantiate_template): Set processing_template_decl to
+	zero while performing substitutions.
+
 2006-06-14  Mark Mitchell  <mark@codesourcery.com>
 
 	PR c++/27665

gcc/cp/pt.c

@@ -9233,6 +9233,7 @@ instantiate_template (tree tmpl, tree targ_ptr, tsubst_flags_t complain)
   tree fndecl;
   tree gen_tmpl;
   tree spec;
+  HOST_WIDE_INT saved_processing_template_decl;
 
   if (tmpl == error_mark_node)
     return error_mark_node;
@@ -9292,9 +9293,17 @@ instantiate_template (tree tmpl, tree targ_ptr, tsubst_flags_t complain)
      deferring all checks until we have the FUNCTION_DECL.  */
   push_deferring_access_checks (dk_deferred);
 
-  /* Substitute template parameters.  */
+  /* Although PROCESSING_TEMPLATE_DECL may be true at this point
+     (because, for example, we have encountered a non-dependent
+     function call in the body of a template function must determine
+     which of several overloaded functions will be called), within the
+     instantiation itself we are not processing a template.  */  
+  saved_processing_template_decl = processing_template_decl;
+  processing_template_decl = 0;
+  /* Substitute template parameters to obtain the specialization.  */
   fndecl = tsubst (DECL_TEMPLATE_RESULT (gen_tmpl),
 		   targ_ptr, complain, gen_tmpl);
+  processing_template_decl = saved_processing_template_decl;
   if (fndecl == error_mark_node)
     return error_mark_node;
 

gcc/testsuite/ChangeLog

+2006-06-15  Mark Mitchell  <mark@codesourcery.com>
+
+	PR c++/27640
+	* g++.dg/template/ctor7.C: New test.
+
 2006-06-15  Janis Johnson  <janis187@us.ibm.com>
 
 	* gcc.dg/vmx/pr27842.c: Remove dg-do directive; use default.

gcc/testsuite/g++.dg/template/ctor7.C

+// PR c++/27640
+
+template < class T > struct refcounted : 
+virtual T
+{
+  template < class A1 > refcounted (const A1 & a1) : T () { }
+};
+struct nfsserv {};
+template < class T >
+void
+sfsserver_cache_alloc (int *ns)
+{
+  new refcounted < nfsserv > (*ns);
+}
+void
+usage ()
+{
+  sfsserver_cache_alloc < int > ( 0);
+}