re PR c++/51612 ([c++0x] [4.6/4.7 Regression] ICE with constexpr constructor and virtual base class)

/cp
2011-12-20  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/51612
	* semantics.c (is_valid_constexpr_fn): In case of constexpr
	constructors also check for virtual base classes.

/testsuite
2011-12-20  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/51612
	* g++.dg/cpp0x/constexpr-ice4.C: New.

From-SVN: r182526