Re: [PATCH v6 13/17] arm64:ilp32: add sys_ilp32.c and a separate table (in entry.S) to use it

From: Joseph Myers
Date: Mon Nov 16 2015 - 05:18:11 EST

On Sun, 15 Nov 2015, Chris Metcalf wrote:

> I've added Rich, Paul, Joseph, and Mike to the cc's as they are probably
> a good subset of libc-alpha to help comment on these issues. My sense
> is that right now, it wouldn't be possible to add a 32-bit architecture
> with a non-32-bit default for _FILE_OFFSET_BITS. And, obviously, this
> is why, when I added the tilegx32 APIs to glibc in 2011, I needed to
> provide _FILE_OFFSET_BITS=32 support.

x32 uses 64-bit off_t only. That's not a problem; the problems are
tv_nsec not of type long, a bug we should avoid for all new ports (padding
on tv_nsec is fine; treating that padding as a significant high part of a
64-bit value on input to glibc / kernel interfaces isn't), and maybe some
other types being 64-bit unnecessarily, although as far as I know the
suggested issues there
<> are all

It's true that we don't have a very clear notion of what "wordsize-64"
sysdeps directories mean in glibc for cases such as x32. See

Joseph S. Myers
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