[PATCH] Use posix_fallocate instead of ftruncate.

[Rui Ueyama via llvm-commits]

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.

On Tue, Jul 19, 2016 at 10:16 AM, Rafael Espíndola <
rafael.espindola at gmail.com> wrote:

> This also makes lld marginally faster.
>
> Cheers,
> Rafael
>
>
> On 19 July 2016 at 10:06, Rafael Espíndola <rafael.espindola at gmail.com>
> wrote:
> > This makes sure that space is actually available. With this change
> > running lld on a full file system causes it to exit with
> >
> >  failed to open foo: No space left on device
> >
> > instead of crashing with a sigbus.
> >
> > Cheers,
> > Rafael
>
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