[C++ Patch] PR 58878

[Paolo Carlini]

Hi,

here the issue is that we fail to detect shadowing declarations in 
inline member function templates. The reason is the following check in 
check_template_shadow:

   if (decl == olddecl
-      || TEMPLATE_PARMS_FOR_INLINE (current_template_parms))
+      || (DECL_TEMPLATE_PARM_P (decl)
+      && TEMPLATE_PARMS_FOR_INLINE (current_template_parms)))
     return true;

which, to avoid duplicate error messages involving template parameters 
(see g++.old-deja/g++.benjamin/tem0[34].C) ends up skipping VAR_DECLs 
etc too.

Tested x86_64-linux.

Thanks,
Paolo.

/////////////////////////
/cp
2013-10-25  Paolo Carlini  <paolo.carl...@oracle.com>

        PR c++/58878
        * pt.c (check_template_shadow): Don't skip declarations in inline
        member templates.

/testsuite
2013-10-25  Paolo Carlini  <paolo.carl...@oracle.com>

        PR c++/58878
        * g++.dg/template/pr58878.C: New.
Index: cp/pt.c
===================================================================
--- cp/pt.c     (revision 204056)
+++ cp/pt.c     (working copy)
@@ -3511,7 +3511,8 @@ check_template_shadow (tree decl)
      name inside a class.  We check TPFI to avoid duplicate errors for
      inline member templates.  */
   if (decl == olddecl
-      || TEMPLATE_PARMS_FOR_INLINE (current_template_parms))
+      || (DECL_TEMPLATE_PARM_P (decl)
+         && TEMPLATE_PARMS_FOR_INLINE (current_template_parms)))
     return true;
 
   error ("declaration of %q+#D", decl);
Index: testsuite/g++.dg/template/pr58878.C
===================================================================
--- testsuite/g++.dg/template/pr58878.C (revision 0)
+++ testsuite/g++.dg/template/pr58878.C (working copy)
@@ -0,0 +1,62 @@
+// PR c++/58878
+
+// Template-members of non-template class
+struct A
+{
+    template <typename t>    // { dg-error "shadows" }
+        void f()
+        {
+            int t = 1;       // { dg-error "declaration" }
+        }
+
+    template <typename t>
+        void g();
+};
+
+template <typename t>        // { dg-error "shadows" }
+void A::g()
+{
+    int t = 2;               // { dg-error "declaration" }
+}
+
+// (Non-template) Members of template class
+template <typename t>        // { dg-error "shadows" }
+struct B
+{
+    void f()
+    {
+        int t = 3;           // { dg-error "declaration" }
+    }
+
+    void g();
+};
+
+template <typename t>        // { dg-error "shadows" }
+void B<t>::g()
+{
+    int t = 4;               // { dg-error "declaration" }
+}
+
+
+// Template members of template class
+template <typename t>        // { dg-error "shadows" }
+struct C
+{
+    template <typename s>    // { dg-error "shadows" }
+    void f()
+    {
+        int t = 5;           // { dg-error "declaration" }
+        int s = 6;           // { dg-error "declaration" }
+    }
+
+    template <typename s>
+    void g();
+};
+
+template <typename t>        // { dg-error "shadows" }
+template <typename s>        // { dg-error "shadows" }
+void C<t>::g()
+{
+    int t = 7;               // { dg-error "declaration" }
+    int s = 8;               // { dg-error "declaration" }
+}