[Bug c++/70272] [5 Regression] -flifetime-dse miscompilation starting with r217967

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70272

--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Wed Mar 30 12:42:43 2016
New Revision: 234564

URL: https://gcc.gnu.org/viewcvs?rev=234564&root=gcc&view=rev
Log:
        Backported from mainline
        2016-03-17  Jakub Jelinek  <jakub@redhat.com>

        PR c++/70272
        * decl.c (begin_destructor_body): Don't insert clobber if
        is_empty_class (current_class_type).

        * g++.dg/opt/flifetime-dse6.C: New test.
        * g++.dg/tree-ssa/ehcleanup-1.C: Adjust unreachable count.

Added:
    branches/gcc-5-branch/gcc/testsuite/g++.dg/opt/flifetime-dse6.C
Modified:
    branches/gcc-5-branch/gcc/cp/ChangeLog
    branches/gcc-5-branch/gcc/cp/decl.c
    branches/gcc-5-branch/gcc/testsuite/ChangeLog
    branches/gcc-5-branch/gcc/testsuite/g++.dg/tree-ssa/ehcleanup-1.C