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From: "boris at kolpackov dot net" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/99051] New: [modules] ICE/SIGSEGV in
 get_location_from_adhoc_loc
Date: Wed, 10 Feb 2021 06:19:35 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99051

            Bug ID: 99051
           Summary: [modules] ICE/SIGSEGV in get_location_from_adhoc_loc
           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: ---

cat <<EOF >hello.hxx
#pragma once

#if 1
import <string_view>;
#else
#include <string_view>
#endif

void say_hello (const std::string_view& name);
EOF

g++ -std=3Dc++2a -fmodules-ts -fmodule-header -x c++-header
/path/to/include/c++/11.0.0/string_view
g++ -std=3Dc++2a -fmodules-ts -fmodule-header -x c++-header hello.hxx=20

hello.hxx: internal compiler error: Segmentation fault
0x1809473 crash_signal
        ../../gcc/gcc/toplev.c:327
0x2c2808b get_location_from_adhoc_loc(line_maps const*, unsigned int)
        ../../gcc/libcpp/line-map.c:257
0xc634c8 module_state::write_location(bytes_out&, unsigned int)
        ../../gcc/gcc/cp/module.cc:15600
0xc65c6f module_state::write_define(bytes_out&, cpp_macro const*, bool)
        ../../gcc/gcc/cp/module.cc:16368
0xc66f09 module_state::write_macros(elf_out*, cpp_reader*, unsigned int*)
        ../../gcc/gcc/cp/module.cc:16870
0xc69d65 module_state::write(elf_out*, cpp_reader*)
        ../../gcc/gcc/cp/module.cc:17747
0xc6ffe9 finish_module_processing(cpp_reader*)
        ../../gcc/gcc/cp/module.cc:19778
0xb8e905 c_parse_final_cleanups()
        ../../gcc/gcc/cp/decl2.c:5178
0xf10f4c c_common_parse_file()
        ../../gcc/gcc/c-family/c-opts.c:1240=