[Bug c++/82577] New: ice in compare_base_decls, at alias.c:2053

["dcb314 at hotmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82577

            Bug ID: 82577
           Summary: ice in compare_base_decls, at alias.c:2053
           Product: gcc
           Version: 8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: dcb314 at hotmail dot com
  Target Milestone: ---

Created attachment 42383
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=42383&action=edit
gzipped C++ source code

The attached C++ code, when compiled by flag -O2 on recent gcc trunk,
does this:

kernel/qregion_x11.cpp:2898:1: internal compiler error: tree check: expected
tre
e that contains ‘decl with visibility’ structure, have ‘parm_decl’ in
compare_ba
se_decls, at alias.c:2053
0x5a4a0c tree_contains_struct_check_failed(tree_node const*,
tree_node_structure
_enum, char const*, int, char const*)
        ../../trunk/gcc/tree.c:9253
0x917303 contains_struct_check(tree_node*, tree_node_structure_enum, char
const*
, int, char const*)
        ../../trunk/gcc/tree.h:3196
0x917303 compare_base_decls(tree_node*, tree_node*)
        ../../trunk/gcc/alias.c:2053
0xfc2829 decl_refs_may_alias_p
        ../../trunk/gcc/tree-ssa-alias.c:1100

I'll have a go at reducing the code and finding a range of revisions
for the bug.