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From: "jo.hiller+gcc at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/110805] New: g++ crash on modules with exported class
 providing string constant with obscure content
Date: Tue, 25 Jul 2023 16:27:19 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D110805

            Bug ID: 110805
           Summary: g++ crash on modules with exported class providing
                    string constant with obscure content
           Product: gcc
           Version: 13.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: jo.hiller+gcc at gmail dot com
  Target Milestone: ---

Created attachment 55630
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D55630&action=3Dedit
output of -freport-bug

// Info
gcc-13 --version
gcc-13 (Homebrew GCC 13.1.0) 13.1.0
macOS 13.5, arm64, Apple M1 MAX

// Steps to reproduce
* use a C++20 module with exported class providing obscure string constant
* gcc 13.1 crash with "m.cc:3:8: internal compiler error: Segmentation faul=
t:
11"

// m.cc
module;
#include <string>
export module m;
export class Constants {
 public:
  inline static const std::string CONST_CRASH_1 =3D "Bundle-Activator";
};

// build
gcc-13 -freport-bug -std=3Dc++20 -xc++ -fmodules-ts -fmodule-only -Wall -We=
xtra
m.cc
# see attached output file ccRJ91Vu.out

// notes
* exported string constants outside exported class do work
* string constants with different types/values do work as well, see differe=
nt
string value, very obscure
  static constexpr std::string_view CONST_OK_1 =3D "Bundle-Activator";
  inline static const std::string CONST_OK_2 =3D "bundleactivator";
  inline static const std::string CONST_OK_3 =3D "Bundle-Activato";
  inline static const std::string CONST_OK_4 =3D "undle-Activator";
  inline static const std::string CONST_OK_5 =3D "xxxXactivatorll";
* these string constants do fail as well
  inline static const std::string CONST_CRASH_2 =3D "xxxbundleXactivatorlll=
";
  inline static const std::string CONST_CRASH_3 =3D "xxxXactivatorlll";
  inline static const std::string CONST_CRASH_4 =3D "xxxXactivatorlll";
* it seems this pattern ".*.activator.*" triggeres special handling in gcc-=
13,
lower/upper case seems not to be relevant, but number of characters
before/after=