[PATCH] Use posix_fallocate instead of ftruncate.

[Rafael Espíndola via llvm-commits]

On 19 July 2016 at 13:11, Rui Ueyama <ruiu at google.com> wrote:
> I have a concern about this change when it is used on a filesystem that
> doesn't support file pre-allocation. The function should work on a
> filesystem that doesn't support an underlying fallocate(-ish) system call,
> but in that case I believe it tries to actually write data to force
> allocation. In that case it'd be slow.

It still seems better than crashing, no?

Which filesystems do you have in mind? I have a spare partition, so I
should be able to test pretty much anything that linux supports. I
will give HFS+ a try on OS X too.

Cheers,
Rafael