Hi!
add_conv_candidate creates cand->fn which is not a FUNCTION_DECL, but
some type, all spots in convert_like_real assume that if fn is non-NULL, it
is some decl. Just a couple of lines above this hunk we even have a comment
reminding us on cand->fn not having to be a decl:
/* Since cand->fn will be a type, not a function, for a conversion
function, we must be careful not to unconditionally look at
DECL_NAME here. */
So, this patch uses just convert_like instead of convert_like_with_context
if cand->fn is not a decl (or shall I test for TREE_CODE (cand->fn) ==
FUNCTION_DECL instead?).
Bootstrapped/regtested on x86_64-linux and i686-linux, ok for trunk/6.2?
2016-07-11 Jakub Jelinek <ja...@redhat.com>
PR c++/71835
* call.c (build_op_call_1): Use convert_like_with_context only
if cand->fn is a decl.
* g++.dg/conversion/ambig3.C: New test.
--- gcc/cp/call.c.jj 2016-07-11 11:14:28.000000000 +0200
+++ gcc/cp/call.c 2016-07-11 14:42:44.466186449 +0200
@@ -4406,8 +4406,11 @@ build_op_call_1 (tree obj, vec<tree, va_
result = build_over_call (cand, LOOKUP_NORMAL, complain);
else
{
- obj = convert_like_with_context (cand->convs[0], obj, cand->fn, -1,
- complain);
+ if (DECL_P (cand->fn))
+ obj = convert_like_with_context (cand->convs[0], obj, cand->fn,
+ -1, complain);
+ else
+ obj = convert_like (cand->convs[0], obj, complain);
obj = convert_from_reference (obj);
result = cp_build_function_call_vec (obj, args, complain);
}
--- gcc/testsuite/g++.dg/conversion/ambig3.C.jj 2016-07-11 14:47:26.668826075
+0200
+++ gcc/testsuite/g++.dg/conversion/ambig3.C 2016-07-11 14:46:49.000000000
+0200
@@ -0,0 +1,13 @@
+// PR c++/71835
+// { dg-do compile }
+
+typedef void T (int);
+struct A { operator T * (); }; // { dg-message "candidate" }
+struct B { operator T * (); }; // { dg-message "candidate" }
+struct C : A, B {} c;
+
+void
+foo ()
+{
+ c (0); // { dg-error "is ambiguous" }
+}
Jakub
