https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123059
Bug ID: 123059
Summary: [[musttail]] on normal call in void function is
silently ignored
Product: gcc
Version: 15.2.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: hanicka at hanicka dot net
Target Milestone: ---
https://compiler-explorer.com/z/1s65K5hze
When I use [[gnu::musttail]] here:
```c++
void g();
void f() {
[[gnu::musttail]] g();
}
```
The attribute is silently ignored, and emitted code contains (with -O0)
```
f():
push rbp
mov rbp, rsp
call g()
nop
pop rbp
ret
```
I would expect one of following behaviors:
A) error for using the attribute anywhere but infront of a return statement
B) make a tail-recursion to work like if there was a `return` if it's a last
function call in a void returning function
