| Issue |
156820
|
| Summary |
clang-21.1.0 regression: Cannot select: intrinsic %llvm.coro.noop
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
vogelsgesang
|
Clang 21.1.0 crashes with the message
> fatal error: error in backend: Cannot select: intrinsic %llvm.coro.noop
when compiling
```c++
#include <coroutine>
void x() {
std::noop_coroutine();
}
```
with clang 21 and the flags `-std=c++23 -O0 -stdlib=libc++`.
https://godbolt.org/z/Gnb6Mvoao
The same code compiles in clang 20.1.0.
Note that the code compiles fine as soon as the same file contains an actual coroutine. Probably we skip the `%llvm.coro.noop`-lowering pass if the translation unit does not contain any coroutine
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