[Bug c++/84724] [7/8 Regression] internal compiler error: in single_succ_edge, at basic-block.h:339 with a declaration of __builtin_trap

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84724

--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Fri Mar  9 18:01:22 2018
New Revision: 258391

URL: https://gcc.gnu.org/viewcvs?rev=258391&root=gcc&view=rev
Log:
        PR c++/84724
        * decl.c (duplicate_decls): Don't override __* prefixed builtins
        except for __[^b]*_chk, instead issue permerror and for -fpermissive
        also a note and return olddecl.

        * g++.dg/ext/pr84724.C: New test.

Added:
    trunk/gcc/testsuite/g++.dg/ext/pr84724-1.C
    trunk/gcc/testsuite/g++.dg/ext/pr84724-2.C
    trunk/gcc/testsuite/g++.dg/ext/pr84724-3.C
Modified:
    trunk/gcc/cp/ChangeLog
    trunk/gcc/cp/decl.c
    trunk/gcc/testsuite/ChangeLog