Sorry for the incorrect blame. I thought the failure was due to GOMP changes, but it appears to be due to the placement new size changes. I am re-testing after Martin's fix.
By the way, Martin, the ChangeLog entry is wrong 2015-11-05 Martin Sebor <mse...@redhat.com> PR c++/67942 * invoke.texi (-Wplacement-new): Document new option. * gcc/testsuite/g++.dg/warn/Wplacement-new-size.C: New test. The invoke.texi change should list doc/invoke.texi and the testsuite change should go in testsuite/ChangeLog. Thanks, David