[Bug c++/115501] [13/14/15 Regression] ICE: in build_call_a with dynamic_cast after invalid definition of __cxxabiv1::__dynamic_cast since r13-3299

[cvs-commit at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115501

--- Comment #10 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The trunk branch has been updated by Marek Polacek <mpola...@gcc.gnu.org>:

https://gcc.gnu.org/g:71f484d02b2b3e8616cd7af27a0d4c72e4c7e977

commit r15-1620-g71f484d02b2b3e8616cd7af27a0d4c72e4c7e977
Author: Marek Polacek <pola...@redhat.com>
Date:   Tue Jun 18 10:50:49 2024 -0400

    c++: ICE with __dynamic_cast redecl [PR115501]

    Since r13-3299, build_dynamic_cast_1 calls pushdecl which calls
    duplicate_decls and that in this testcase emits the "conflicting
    declaration" error and returns error_mark_node, so the subsequent
    build_cxx_call crashes on the error_mark_node.

            PR c++/115501

    gcc/cp/ChangeLog:

            * rtti.cc (build_dynamic_cast_1): Return if dcast_fn is erroneous.

    gcc/testsuite/ChangeLog:

            * g++.dg/rtti/dyncast8.C: New test.