https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105512
Bug ID: 105512
Summary: compilation with -fmodules-ts and std=c++20 leads to
segfault
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: deco33000 at yandex dot com
Target Milestone: ---
Hi,
compiling with -fmodules-ts and -std=c++20 leads to a segfault. With c++17 no
errors. Without std= switch, no segfault.
But c++20 is required in my code, hence the report.
Here is the reduced code:
----- main.cpp
import hello;
int main ( void ){
X::greeter("ok");
return 0;
}
-----mod.cxx
module;
#include <iostream>
#include <string_view>
#include <string>
export module hello;
import sub_mod;
namespace X {
void greeter2 ( std::string_view const &name ){
std::string h = "exported greeter";
std::cout << "Bye " << name << "!" << h << "\n";
Y::g();
}
}
export {
namespace X {
void greeter ( std::string_view const &name ){
std::string h = "exported greeter";
std::cout << "Hello " << name << "!" << h << "\n";
greeter2("ff");
}
}
}
-----mod_sub.cxx
module;
#include <iostream>
export module sub_mod;
export {
namespace Y {
auto g (){
std::cout << "in out " << std::endl;
}
}
}
The following works with c++17 and c++20 flags (no issue):
----- mod_sub.cxx corrected (no global fragment):
export module sub_mod;
export {
namespace Y {
auto g ()-> int{
//std::cout << "in out " << std::endl;
return 54;
}
}
}
and
----- mod.cxx corrected (prints g() directly):
module;
#include <iostream>
#include <string_view>
#include <string>
export module hello;
import sub_mod;
namespace X {
void greeter2 ( std::string_view const &name ){
std::string h = "exported greeter";
std::cout << "Bye " << name << "!" << h << " " <<
Y::g() <<"\n";
}
}
export {
namespace X {
void greeter ( std::string_view const &name ){
std::string h = "exported greeter";
std::cout << "Hello " << name << "!" << h << "\n";
greeter2("ff");
}
}
}
Thanks,
