NagyDonat wrote:
> BTW wouldn't this patch break the semantics of `freopen`? That one should
> invalidate the file ptr, right? Could you demonstrate this?
No, `freopen` should _not_ invalidate the file _ptr_, because it modifies the
stream object (associating it with a different file) _without_ changing the
pointer identity of the stream object. In fact, if you consider the signature,
you can see that in
```c
FILE *freopen(const char *pathname, const char *mode, FILE *stream);
```
the third parameter takes an _rvalue_ of type `FILE *`, so if you call e.g.
`freopen("somefile.txt", "r", stdin)` then this cannot invalidate the `FILE *`
pointer stored in the global variable `stdin`.
https://github.com/llvm/llvm-project/pull/147766
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