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From: "huscar at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/106951] New: Segmentation fault during compilation while
 using modules
Date: Thu, 15 Sep 2022 13:27:42 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106951

            Bug ID: 106951
           Summary: Segmentation fault during compilation while using
                    modules
           Product: gcc
           Version: 12.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: huscar at gmail dot com
  Target Milestone: ---

Created attachment 53579
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D53579&action=3Dedit
Zipper preprocessor source

Got a segmentation fault during compilation when porting a project over to
modules.

encountered on 12.2.0 (from docker gcc:12.2.0) and 11.2.0 (from apt)


command used:
g++ -c src/creatures.cpp -Ilibs/game-engine/include -std=3Dc++20 -Wall -Wex=
tra
-Werror -fmodules-ts -o src/creatures.o -freport-bug


compiler output:
In module imported at libs/game-engine/src/engine.cpp:17:1,
of module GameEngine.Main, imported at src/creatures.cpp:10:
GameEngine.Components.Transform: note: unable to represent further imported
source locations

In module imported at libs/game-engine/src/engine.cpp:21:1:
Segmentation fault
0x1b9fe76 internal_error(char const*, ...)
        ???:0
0x1bab157 pp_format(pretty_printer*, text_info*)
        ???:0
0x1bac520 pp_verbatim(pretty_printer*, char const*, ...)
        ???:0
0x1b9eca1 diagnostic_report_diagnostic(diagnostic_context*, diagnostic_info=
*)
        ???:0
0x1b9f782 warning_at(unsigned int, int, char const*, ...)
        ???:0
0x9a6c07 do_warn_unused_parameter(tree_node*)
        ???:0
0x7cd12f finish_function(bool)
        ???:0
0x8c11c9 instantiate_decl(tree_node*, bool, bool)
        ???:0
0x8d5cab instantiate_pending_templates(int)
        ???:0
0x7db2df c_parse_final_cleanups()
        ???:0
Please submit a full bug report, with preprocessed source (by using
-freport-bug).


I've attached the preprocessor source attached.

Segfault goes away after removing the line:
import GameEngine.Main;

The other import declaration in the same source file do not cause segmentat=
ion
faults, nor does that same import (GameEngine.Main) from a different source
file.=