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