In this case, we ran into an access control error trying to print the
meaning of a decltype while dumping instantiation context. The simplest
answer is to just disable access control during that process rather than
try to push into the right context.
Tested x86_64-pc-linux-gnu, applying to trunk.
commit 8b9688d5cdf39fb306257ea0d02a7e4239179913
Author: Jason Merrill <ja...@redhat.com>
Date: Sun May 22 15:54:43 2011 -0400
PR c++/47336
* error.c (dump_template_bindings): Suppress access control.
diff --git a/gcc/cp/error.c b/gcc/cp/error.c
index e580fd9..a6648cc 100644
--- a/gcc/cp/error.c
+++ b/gcc/cp/error.c
@@ -313,7 +313,9 @@ dump_template_bindings (tree parms, tree args, VEC(tree,gc)* typenames)
pp_cxx_whitespace (cxx_pp);
pp_equal (cxx_pp);
pp_cxx_whitespace (cxx_pp);
+ push_deferring_access_checks (dk_no_check);
t = tsubst (t, args, tf_none, NULL_TREE);
+ pop_deferring_access_checks ();
/* Strip typedefs. We can't just use TFF_CHASE_TYPEDEF because
pp_simple_type_specifier doesn't know about it. */
t = strip_typedefs (t);
diff --git a/gcc/testsuite/g++.dg/cpp0x/error3.C b/gcc/testsuite/g++.dg/cpp0x/error3.C
new file mode 100644
index 0000000..e7da961
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp0x/error3.C
@@ -0,0 +1,24 @@
+// PR c++/47336
+// { dg-options -std=c++0x }
+
+template <typename T>
+void g(T t)
+{
+ t+1; // { dg-error "no match" }
+}
+
+template <typename S>
+class C
+{
+ struct D {} d;
+public:
+ decltype(g(d)) h()
+ {
+ return g(d);
+ }
+};
+
+int main()
+{
+ C<int>().h();
+}
