https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123975
Bug ID: 123975
Summary: Crash when await_suspend takes an r-value (&&)
argument
Product: gcc
Version: 15.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: maddimax at gmail dot com
Target Milestone: ---
Please see: https://godbolt.org/z/513c39dYz
GCC 14, and clang 21.1.0 compile and run the code without issues. GCC 15.1 &
15.2 run into an SIGBUS error when trying to access p.value. As a workaround,
change the argument `h` to a value solves the issue. I'm still quite new to
coroutines so it might just be a bug in the code, but since GCC14 & Clang don't
show the issue I think it might be a valid issue.
```
//#if __GNUC__ >= 15
// void await_suspend(auto h) {
//#else
void await_suspend(auto &&h) {
//#endif
auto p = h.promise();
p.value->emplace(std::unexpected{value.error()});
}
```
Please let me know if I can provide any other material.
Cheers,
Marcus
