Hello,
In the example of the patch below, the lookup of symbol 'T' yields the
template parameter instead of the typedef Base::T. That's because
outer_binding considers the template-parameters-scope bindings from
Derived<T>::foo even though that template doesn't have it's own
template header. outer_binding should first consider the class-scope
bindings from Derived<T>::foo.
The patch tightens binding_to_template_parms_of_scope_p to make it
only consider template parameters of the scope of a template which has
its own template header.
Tested on x86_64-unknown-linux-gnu against trunk.
--
Dodji
>From 48496aa3972649c82bc1c16c59c461102270caad Mon Sep 17 00:00:00 2001
From: Dodji Seketeli <do...@redhat.com>
Date: Mon, 7 Mar 2011 16:47:17 +0100
Subject: [PATCH] PR c++/47957
gcc/cp/
* name-lookup.c (binding_to_template_parms_of_scope_p): Only
consider scopes of primary template definitions. Adjust comments.
gcc/testsuite/
* g++.dg/lookup/template3.C: New test.
---
gcc/cp/name-lookup.c | 11 ++++++++-
gcc/testsuite/g++.dg/lookup/template3.C | 35 +++++++++++++++++++++++++++++++
2 files changed, 44 insertions(+), 2 deletions(-)
create mode 100644 gcc/testsuite/g++.dg/lookup/template3.C
diff --git a/gcc/cp/name-lookup.c b/gcc/cp/name-lookup.c
index 4117202..18e3441 100644
--- a/gcc/cp/name-lookup.c
+++ b/gcc/cp/name-lookup.c
@@ -4205,8 +4205,13 @@ qualified_lookup_using_namespace (tree name, tree scope,
}
/* Subroutine of outer_binding.
- Returns TRUE if BINDING is a binding to a template parameter of SCOPE,
- FALSE otherwise. */
+
+ Returns TRUE if BINDING is a binding to a template parameter of
+ SCOPE. In that case SCOPE is the scope of a primary template
+ parameter -- in the sense of G++, i.e, a template that has its own
+ template header.
+
+ Returns FALSE otherwise. */
static bool
binding_to_template_parms_of_scope_p (cxx_binding *binding,
@@ -4222,6 +4227,8 @@ binding_to_template_parms_of_scope_p (cxx_binding
*binding,
return (scope
&& scope->this_entity
&& get_template_info (scope->this_entity)
+ && PRIMARY_TEMPLATE_P (TI_TEMPLATE
+ (get_template_info (scope->this_entity)))
&& parameter_of_template_p (binding_value,
TI_TEMPLATE (get_template_info \
(scope->this_entity))));
diff --git a/gcc/testsuite/g++.dg/lookup/template3.C
b/gcc/testsuite/g++.dg/lookup/template3.C
new file mode 100644
index 0000000..e5f6f18
--- /dev/null
+++ b/gcc/testsuite/g++.dg/lookup/template3.C
@@ -0,0 +1,35 @@
+// Origin PR c++/47957
+// { dg-do compile }
+
+struct S
+{
+ int m;
+
+ S()
+ : m(0)
+ {
+ }
+};
+
+struct Base
+{
+ typedef S T;
+};
+
+template<class T>
+struct Derived : public Base
+{
+ int
+ foo()
+ {
+ T a; // This is Base::T, not the template parameter.
+ return a.m;
+ }
+};
+
+int
+main()
+{
+ Derived<char> d;
+ return d.foo();
+}
--
1.7.3.4
