Re: macOS 14 objc `+initialize` forced crash due to fork after thread

[Tom]

> It looks like it's the call to setlocale() that creates the auxiliary
> threads, and the call to gettext() that forces the artificial crash.

Yep, that's my understanding.

> So any call to gettext() in the parent process before any fork would be
> sufficient to complete the initialization?

It does appear that way; running the following (a modification of the repro I 
put to the `gettext` list):

```
#include <libintl.h>
#include <stdlib.h>
#include <unistd.h>

int main() {
  unsetenv("LANG");

  setlocale(LC_ALL, "");

  gettext("");

  if (fork()== 0) {
    gettext("test");
  }
}
```

causes the issue to no longer trigger. Note that `LANG` needs to be cleared 
before the call to `setlocale` to trigger the issue.