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Date: Mon, 17 Feb 2020 10:29:09 -0500
From: Rich Felker <>
Subject: Re: [PATCH] add statx

On Mon, Feb 17, 2020 at 10:10:40AM +0100, Florian Weimer wrote:
> * Rich Felker:
> >> That's why the kernel always uses unsigned long long for __u64, which
> >> seems a reasonable trade-off to me.  It will make porting to 128-bit
> >> architectures difficult.  But I think we should focus on the
> >> architectures we have today.
> >
> > I disagree strongly with the last sentence. Designing an *API* in a
> > way that's not compatible with anything but long long == 64-bit is bad
> > API design.
> We don't know what LL128 architectures will look like.  For all we know,
> they might have more expressive type descriptors for variadic functions,
> so the whole issue of matching integer types with precise format
> specifiers becomes moot.

I don't follow. Mechanically the wrong format for long long vs
int64_t *already works*; the problem at hand is that per the
language, it's undefined, and rightly produces warnings. None of that
would go away if LL128 archs used a fancy variadic call mechanism.


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