We need to be careful not to do any access checking on the actual
arguments to the function when we're pushed into the context of the
function being instantiated.
Tested x86_64-pc-linux-gnu, applying to trunk.
commit 7498f299d97da75ce3ab30d0626818a143fbaab9
Author: Jason Merrill <ja...@redhat.com>
Date: Fri Feb 22 10:44:03 2013 -0500
PR c++/56359
* call.c (can_convert_arg): Discard access checks.
diff --git a/gcc/cp/call.c b/gcc/cp/call.c
index 25dfd51..7c41421 100644
--- a/gcc/cp/call.c
+++ b/gcc/cp/call.c
@@ -8765,11 +8765,18 @@ can_convert_arg (tree to, tree from, tree arg, int flags,
/* Get the high-water mark for the CONVERSION_OBSTACK. */
p = conversion_obstack_alloc (0);
+ /* We want to discard any access checks done for this test,
+ as we might not be in the appropriate access context and
+ we'll do the check again when we actually perform the
+ conversion. */
+ push_deferring_access_checks (dk_deferred);
t = implicit_conversion (to, from, arg, /*c_cast_p=*/false,
flags, complain);
ok_p = (t && !t->bad_p);
+ /* Discard the access checks now. */
+ pop_deferring_access_checks ();
/* Free all the conversions we allocated. */
obstack_free (&conversion_obstack, p);
diff --git a/gcc/testsuite/g++.dg/template/access25.C b/gcc/testsuite/g++.dg/template/access25.C
new file mode 100644
index 0000000..e882a70
--- /dev/null
+++ b/gcc/testsuite/g++.dg/template/access25.C
@@ -0,0 +1,20 @@
+// PR c++/56359
+
+typedef int (*InvocationCallback) (const int &);
+
+template < typename target_t >
+void SetPrototypeMethod (target_t, const char *, InvocationCallback);
+
+class A
+{
+ void Initialize ();
+protected:
+ static int Stop (const int &);
+ void Stop (); // comment out to make the bug disappear.
+};
+
+void
+A::Initialize ()
+{
+ SetPrototypeMethod (0, "stop", A::Stop);
+}
