c++: conversion to base of vbase in NSDMI [PR80431]

The delayed processing of conversions to a virtual base in an NSDMI
assumes the target base type is a (possibly indirect) virtual base of
the current class, but the target base type could also be a base of a
virtual base, as in the testcase below.  Since such a base isn't a part
of CLASSTYPE_VBASECLASSES, we end up miscompiling the testcase due to
the call to build_base_path (with binfo=NULL_TREE) silently returning
error_mark_node.  Fix this by using convert_to_base to build the
conversion instead.

	PR c++/80431

gcc/cp/ChangeLog:

	* tree.c (bot_replace): Use convert_to_base to build the
	conversion to the (morally) virtual base.

gcc/testsuite/ChangeLog:

	* g++.dg/cpp0x/nsdmi-virtual1a.C: New test.

0 files changed, 0 insertions, 0 deletions