https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104202
Bug ID: 104202
Summary: when defining a std::string in a module implementation
file using -O2 g++ segfaults
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: f.b.brokken at rug dot nl
Target Milestone: ---
Created attachment 52274
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=52274&action=edit
Output of the compiler (segfaults) when compiling 'mod.cc'
Using the following main file (main.cc):
---------------------------------
#include <iostream>
import mod;
int main()
{
std::cout << modstr << '\n';
}
---------------------------------
defining the module mod interface in a separate file (zfirst.cc):
---------------------------------
module;
#include <string>
export module mod;
export extern std::string modstr;
---------------------------------
and initializing modstr in a separate module implementation file (mod.cc):
-------------------------------
module;
#include <string>
module mod;
std::string modstr{ "hello" };
-------------------------------
compiles OK when using the following compiler options:
--std=c++20 -Wall -Wextra -fno-strict-aliasing -fwrapv -fmodules-ts
but when adding the option -O2 the compiler segfaults (compiler output is
attached). Omitting the -Wextra -fno-strict-aliasing -fwrapv options makes no
difference.
The compilation was performed on a (yesterday) updated Debian testing
distribution using
g++ (Debian 12-20211217-1) 12.0.0 20211217 (experimental) [master
r12-6027-g774269aa4b9]
Copyright (C) 2021 Free Software Foundation, Inc.
If you need any additional information, please let me know.
Kind regards,
Frank.
