[Bug c++/83461] New: [8 regression] Segmentation fault on __attribute__ with multiple inheritance

[sylvestre at debian dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83461

            Bug ID: 83461
           Summary: [8 regression] Segmentation fault on __attribute__
                    with multiple inheritance
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: sylvestre at debian dot org
                CC: jakub at gcc dot gnu.org, trippels at gcc dot gnu.org
  Target Milestone: ---

Building Firefox with gcc 8 from Debian experimental:
g++-8 (Debian 8-20171213-1) 8.0.0 20171213 (experimental) [trunk revision
255604]

$ g++-8 foo.cpp
foo4.cpp:12:68: internal compiler error: Segmentation fault
   __attribute__ ((warn_unused_result)) int AddCookiesToRequest(void);
                                                                    ^
$ cat foo.cpp
class foo {
int AddCookiesToRequest(void);
};

class bar {
int AddCookiesToRequest(void);
};

class HttpChannelChild final : public bar
                             , public foo
{
  __attribute__ ((warn_unused_result)) int AddCookiesToRequest(void);
};