https://gcc.gnu.org/bugzilla/show_bug.cgi?id=126233
--- Comment #1 from Ivan Lazaric <ivan.lazaric.gcc at gmail dot com> ---
Just noting clang says `function_name()` is an empty string in these cases
```cpp
#include <cassert>
#include <source_location>
consteval int strlen(const char* a) {
int len = 0;
while (a[len]) ++len;
return len;
}
consteval bool check(std::source_location loc) {
assert(loc.line() == 16);
assert(strlen(loc.function_name()) == 0);
return true;
}
template<auto S = check(std::source_location::current())>
void fn() {}
int main() { fn(); }
```
Godbolt: https://godbolt.org/z/o6dM6Y9PK
