https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95137
stream009 <stream009 at gmail dot com> changed:
What |Removed |Added
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CC| |stream009 at gmail dot com
--- Comment #42 from stream009 <stream009 at gmail dot com> ---
I got strange compile error when I use coroutine with UBSAN.
The weird thing is error is reported in compile time not runtime.
The code compile fine without UBSAN.
GCC version: 11.1
compile option: -std=c++20 -Wall -Wextra -pedantic-errors -fcoroutines
-fsanitize=undefined
compiler explorer link: https://godbolt.org/z/Yva6b1YTz
It seems error happen only coroutine that doesn't return value (promise has
return_void() defined). I don't get error with coroutine that return value.
(https://godbolt.org/z/3jcvYPcqa)
Let me know if I should report this as separate bug.
=== begin source ===
#include <coroutine>
struct result
{
struct promise_type
{
std::suspend_never initial_suspend() { return {}; }
std::suspend_never final_suspend() noexcept { return {}; }
result get_return_object() { return {}; }
void return_void() {}
void unhandled_exception() {}
};
};
result error(int i)
{
if (i == 0) {
co_return;
}
}
=== end source ===
=== begin compile error ===
<source>: In function 'void _Z5errori.actor(error(int)::_Z5errori.frame*)':
<source>:21:9: warning: '<anonymous>' may be used uninitialized
[-Wmaybe-uninitialized]
21 | co_return;
| ^~~~~~~~~
<source>:21:9: note: '<anonymous>' was declared here
21 | co_return;
| ^~~~~~~~~
=== end compile error ===
