[Bug c++/103994] New: Module ICE in mark_by_value, at cp/module.cc:4772

["unlvsur at live dot com" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103994

            Bug ID: 103994
           Summary: Module ICE in mark_by_value, at cp/module.cc:4772
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: unlvsur at live dot com
  Target Milestone: ---

Created attachment 52172
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=52172&action=edit
module ICE

module;

#include <gtirb/gtirb.hpp>

export module cfg;

namespace cfg
{
export struct cfg_vertex
{
        gtirb::CfgNode const* cfg_node_ptr{};
        struct edge
        {
                std::size_t to{};
                gtirb::CfgNode const* cfg_node_ptr{};
        };
        std::vector<edge> edges;
};

export inline std::vector<cfg_vertex> get_cfg()
{
        return {};
}
}


g++ -c cfg.cc -O2 -std=c++20 -fmodules-ts

cfg.cc:5:8: internal compiler error: in mark_by_value, at cp/module.cc:4772
    5 | export module cfg;
      |        ^
0x7f8092e45fcf __libc_start_call_main
        ../sysdeps/nptl/libc_start_call_main.h:58
0x7f8092e4607c __libc_start_main_impl
        ../csu/libc-start.c:409