[Bug c++/98718] New: [modules] use of partitions causes ICE in write_macro_maps

[boris at kolpackov dot net]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98718

            Bug ID: 98718
           Summary: [modules] use of partitions causes ICE in
                    write_macro_maps
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: boris at kolpackov dot net
  Target Milestone: ---

Created attachment 49988
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=49988&action=edit
Reproducer

The attached set of translation units causes an internal compiler error:

hello.mxx:5:9: internal compiler error: in write_macro_maps, at
cp/module.cc:16113
    5 | export module hello;
      |         ^~~~~~
0xc60a67 module_state::write_macro_maps(elf_out*, location_map_info&,
module_state_config*, unsigned int*)
        ../../gcc/gcc/cp/module.cc:16113
0xc659f1 module_state::write(elf_out*, cpp_reader*)
        ../../gcc/gcc/cp/module.cc:17727
0xc6bbfd finish_module_processing(cpp_reader*)
        ../../gcc/gcc/cp/module.cc:19747
0xb8a7a1 c_parse_final_cleanups()
        ../../gcc/gcc/cp/decl2.c:5178
0xf0b805 c_common_parse_file()
        ../../gcc/gcc/c-family/c-opts.c:1233

If I replace std::string with const char* and get rid of the <string>
inclusion, then the ICE disappears. The build transcript is included in the
attached archive.