[Bug c++/70018] [4.9/5/6/7 Regression] Possible issue around IPO and C++ comdats discovered as pure/const

[hubicka at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70018

--- Comment #16 from Jan Hubicka <hubicka at gcc dot gnu.org> ---
Author: hubicka
Date: Thu Apr 21 09:05:07 2016
New Revision: 235318

URL: https://gcc.gnu.org/viewcvs?rev=235318&root=gcc&view=rev
Log:

        PR ipa/70018
        * cgraph.c (cgraph_set_nothrow_flag_1): Rename to ...
        (set_nothrow_flag_1): ... this; handle interposition correctly;
        recurse on aliases and thunks.
        (cgraph_node::set_nothrow_flag): New.
        * ipa-pure-const.c (ignore_edge_for_nothrow): Ignore calls to
        functions compiled with non-call exceptions that binds to current
        def.
        (propagate_nothrow): Be safe WRT interposition.
        * cgraph.h (set_nothrow_flag): Update prototype.

        * g++.dg/ipa/nothrow-1.C: New testcase.

Added:
    trunk/gcc/testsuite/g++.dg/ipa/nothrow-1.C
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/cgraph.c
    trunk/gcc/cgraph.h
    trunk/gcc/ipa-pure-const.c
    trunk/gcc/testsuite/ChangeLog