From: Joseph Myers <joseph@codesourcery.com>
To: David Laight <David.Laight@ACULAB.COM>
Cc: 'Florian Weimer' <fweimer@redhat.com>,
"Alejandro Colomar (man-pages)" <alx.manpages@gmail.com>,
linux-man <linux-man@vger.kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Greg KH <gregkh@linuxfoundation.org>,
LKML <linux-kernel@vger.kernel.org>,
GCC <gcc-patches@gcc.gnu.org>,
"Michael Kerrisk (man-pages)" <mtk.manpages@gmail.com>,
glibc <libc-alpha@sourceware.org>, bpf <bpf@vger.kernel.org>,
Alexei Starovoitov <alexei.starovoitov@gmail.com>
Subject: RE: [RFC v2] bpf.2: Use standard types and attributes
Date: Wed, 5 May 2021 22:22:18 +0000 [thread overview]
Message-ID: <alpine.DEB.2.22.394.2105052219590.508961@digraph.polyomino.org.uk> (raw)
In-Reply-To: <a17b3a3c7eff46829666d2b07adda0be@AcuMS.aculab.com>
On Wed, 5 May 2021, David Laight via Libc-alpha wrote:
> > __u64 can't be formatted with %llu on all architectures. That's not
> > true for uint64_t, where you have to use %lu on some architectures to
> > avoid compiler warnings (and technically undefined behavior). There are
> > preprocessor macros to get the expected format specifiers, but they are
> > clunky. I don't know if the problem applies to uint32_t. It does
> > happen with size_t and ptrdiff_t on 32-bit targets (both vary between
> > int and long).
>
> uint32_t can be 'randomly' either int or long on typical 32bit architectures.
> The correct way to print it is with eg "xxx %5.4" PRI_u32 " yyy".
C2X adds printf length modifiers such as "w32", so you can use a
friendlier %w32u, for example. (Not yet implemented in glibc or in GCC's
format checking.)
--
Joseph S. Myers
joseph@codesourcery.com
next prev parent reply other threads:[~2021-05-05 22:22 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20210423230609.13519-1-alx.manpages@gmail.com>
2021-04-23 23:20 ` [RFC] bpf.2: Use standard types and attributes Alexei Starovoitov
2021-04-24 17:56 ` Alejandro Colomar (man-pages)
2021-04-25 16:52 ` Alexei Starovoitov
2021-04-25 19:12 ` Zack Weinberg
2021-04-24 20:43 ` David Laight
2021-04-25 19:16 ` Zack Weinberg
2021-04-25 21:09 ` David Laight
2021-05-04 11:05 ` [RFC v2] " Alejandro Colomar
2021-05-04 14:12 ` Alexei Starovoitov
2021-05-04 14:24 ` Greg KH
2021-05-04 15:53 ` Alejandro Colomar (man-pages)
2021-05-04 16:06 ` Greg KH
2021-05-04 18:37 ` Zack Weinberg
2021-05-04 18:54 ` Alejandro Colomar (man-pages)
2021-05-04 19:45 ` Florian Weimer
2021-05-04 19:59 ` Alejandro Colomar (man-pages)
2021-05-05 8:23 ` David Laight
2021-05-05 22:22 ` Joseph Myers [this message]
2021-05-04 20:06 ` Daniel Borkmann
2021-05-04 20:16 ` Alejandro Colomar (man-pages)
2021-05-04 20:33 ` Zack Weinberg
2021-05-04 21:23 ` Alexei Starovoitov
2021-05-15 19:01 ` [PATCH v3] " Alejandro Colomar
2021-05-16 9:16 ` Alejandro Colomar (man-pages)
2021-05-17 18:56 ` Daniel Borkmann
2021-05-21 11:12 ` Alejandro Colomar
2021-05-04 16:08 ` [RFC v2] " Daniel Borkmann
2022-08-24 18:55 ` [PATCH v3] Many pages: Document fixed-width types with ISO C naming Alejandro Colomar
2022-08-24 22:40 ` Alexei Starovoitov
2022-08-24 23:36 ` Alejandro Colomar
2022-08-25 0:52 ` Linus Torvalds
2022-08-25 7:20 ` Alejandro Colomar
2022-08-25 7:28 ` Xi Ruoyao
2022-08-25 7:48 ` Alejandro Colomar
2022-08-25 8:09 ` Xi Ruoyao
2022-08-25 7:42 ` Linus Torvalds
2022-08-25 7:59 ` Alejandro Colomar
2022-08-25 5:57 ` Greg Kroah-Hartman
2022-08-25 6:41 ` Florian Weimer
2022-08-25 7:27 ` Linus Torvalds
2022-08-25 14:38 ` Joseph Myers
2022-08-25 15:01 ` David Laight
2022-08-25 15:37 ` Joseph Myers
2022-08-25 16:43 ` Linus Torvalds
2022-08-25 7:44 ` Alejandro Colomar
2022-08-25 8:04 ` Alejandro Colomar
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=alpine.DEB.2.22.394.2105052219590.508961@digraph.polyomino.org.uk \
--to=joseph@codesourcery.com \
--cc=David.Laight@ACULAB.COM \
--cc=alexei.starovoitov@gmail.com \
--cc=alx.manpages@gmail.com \
--cc=bpf@vger.kernel.org \
--cc=daniel@iogearbox.net \
--cc=fweimer@redhat.com \
--cc=gcc-patches@gcc.gnu.org \
--cc=gregkh@linuxfoundation.org \
--cc=libc-alpha@sourceware.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-man@vger.kernel.org \
--cc=mtk.manpages@gmail.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).