The Unix Heritage Society mailing list
 help / color / mirror / Atom feed
From: "Nelson H. F. Beebe" <beebe@math.utah.edu>
To: tuhs@minnie.tuhs.org
Subject: Re: [TUHS] v7 K&R C
Date: Fri, 15 May 2020 18:15:29 -0600	[thread overview]
Message-ID: <CMM.0.95.0.1589588129.beebe@gamma.math.utah.edu> (raw)

Discussions today on the TUHS list about the signed/unsigned nature of
the C char type led me to reexamine logs of my feature test package at

	http://www.math.utah.edu/pub/features/

I had 170 build logs for it from 2017.11.07, so I moved those aside
and ran another set of builds in our current enlarged test farm.  That
generated another 361 fresh builds.  Those tests are all with the C
compiler named "cc".  I did not explore what other C compilers did,
but I strongly suspect that they all agree on any single platform.

On all but THREE systems, the tests report that "char" is signed, with
CHAR_MAX == +127.

The three outliers have char unsigned with CHAR_MAX == +255, and are

	* ARM armv7l Linux 4.13.1 (2017) and 5.6.7 (2020)
	* SGI O2 R10000-SC (150 MHz) IRIX 6.5 (2017 and 2020)
	* IBM POWER8 CentOS Linux release 7.4.1708 (AltArch) (2017)

So, while the ISO C Standards, and historical practice, leave it
implementation dependent whether char is signed or unsigned, there is
a strong majority for a signed type.

-------------------------------------------------------------------------------
- Nelson H. F. Beebe                    Tel: +1 801 581 5254                  -
- University of Utah                    FAX: +1 801 581 4148                  -
- Department of Mathematics, 110 LCB    Internet e-mail: beebe@math.utah.edu  -
- 155 S 1400 E RM 233                       beebe@acm.org  beebe@computer.org -
- Salt Lake City, UT 84112-0090, USA    URL: http://www.math.utah.edu/~beebe/ -
-------------------------------------------------------------------------------

             reply	other threads:[~2020-05-16  0:23 UTC|newest]

Thread overview: 139+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-16  0:15 Nelson H. F. Beebe [this message]
2020-05-16  0:28 ` Steffen Nurpmeso
2020-05-16  1:52 ` Warner Losh
2020-05-16 16:31   ` Paul Winalski
2020-05-16 20:35     ` Brad Spencer
2020-05-16 20:37       ` Warner Losh
2020-05-18 12:25     ` Tony Finch
  -- strict thread matches above, loose matches on Subject: below --
2020-05-19 12:29 Noel Chiappa
2020-05-19  2:29 Doug McIlroy
2020-05-19  3:20 ` Steve Nickolas
2020-05-18 14:33 Doug McIlroy
2020-05-18 13:58 Doug McIlroy
2020-05-16 18:45 Richard Tobin
2020-05-16 21:55 ` Ronald Natalie
2020-05-15 21:31 Richard Tobin
2020-05-15 21:53 ` Steve Nickolas
2020-05-15 22:33   ` ron
2020-05-15 23:34     ` Steffen Nurpmeso
2020-05-16  1:26       ` Larry McVoy
2020-05-16 21:59       ` Ronald Natalie
2020-05-16 23:26         ` Steffen Nurpmeso
2020-05-17 16:24           ` Paul Winalski
2020-05-17 16:29             ` ron
2020-05-17 16:38               ` Paul Winalski
2020-05-17 20:08                 ` Clem Cole
2020-05-18  8:46                   ` Peter Jeremy
2020-05-19  7:41                     ` Dave Horsfall
2020-05-18 12:04             ` Tony Finch
2020-05-18 13:10               ` Clem Cole
2020-05-18 15:13             ` Rich Morin
2020-05-18 15:51               ` Brantley Coile
2020-05-18 16:11             ` Dan Cross
2020-05-18 21:18               ` ron
2020-05-17 16:10 ` Derek Fawcus
2020-05-17 16:14   ` ron
2020-05-15 20:34 Doug McIlroy
2020-05-15 20:40 ` Warner Losh
2020-05-14 18:41 Doug McIlroy
2020-05-14 18:45 ` Richard Salz
2020-05-14 20:54 ` Clem Cole
2020-05-15  2:44 ` Rob Pike
2020-05-15  3:57   ` Rich Morin
2020-05-15  7:55   ` Dr Iain Maoileoin
2020-05-15 15:01     ` Larry McVoy
2020-05-15 15:36       ` John P. Linderman
2020-05-15 20:01         ` ron
2020-05-15 20:03           ` Larry McVoy
2020-05-15 20:05           ` Clem Cole
2020-05-15 20:18             ` ron
2020-05-15 20:24               ` Clem Cole
2020-05-16  0:57               ` Brantley Coile
2020-05-16 16:14                 ` Dan Cross
2020-05-15 20:56           ` Steve Nickolas
2020-05-16  0:31             ` Peter Jeremy
2020-05-16  8:30               ` Steve Nickolas
2020-05-16  0:43           ` John P. Linderman
2020-05-16 16:28             ` Paul Winalski
2020-05-16 17:39               ` Warner Losh
2020-05-19 19:45                 ` Peter Pentchev
2020-05-20  3:52                   ` Rich Morin
2020-05-21 15:06                     ` Dave Horsfall
     [not found] <mailman.1.1589421601.13778.tuhs@minnie.tuhs.org>
2020-05-14  3:02 ` Paul McJones
2020-05-14 17:08   ` Paul Winalski
2020-05-14 17:58     ` Clem Cole
2020-04-27 17:45 Noel Chiappa
2020-04-27 17:56 ` Richard Salz
2020-04-27 18:02 ` Brantley Coile
2020-04-27 18:47 ` Derek Fawcus
2020-04-25 19:41 Noel Chiappa
2020-04-25 20:27 ` Steffen Nurpmeso
2020-04-25 13:11 Noel Chiappa
2020-04-25 13:18 ` Rob Pike
2020-04-25 14:57   ` Warner Losh
2020-04-25 18:03   ` Noel Chiappa
2020-04-25 20:11     ` Michael Kjörling
2020-04-25 21:27       ` Brian L. Stuart
2020-04-26  0:07     ` emanuel stiebler
2020-04-26  0:54     ` Rob Pike
2020-04-26 19:37     ` Derek Fawcus
2020-04-26 20:10       ` Derek Fawcus
2020-04-26 21:59         ` Rich Morin
2020-04-26 22:38         ` Noel Hunt
2020-04-26 23:57         ` Nemo Nusquam
2020-04-27  3:38           ` Rob Pike
2020-04-25 13:35 ` Hellwig Geisse
2020-04-25 13:59   ` Richard Salz
2020-04-25 19:01   ` Brian L. Stuart
2020-04-25 20:07     ` Michael Kjörling
2020-04-25 21:34       ` Brian L. Stuart
2020-04-26  6:40     ` arnold
2020-04-25  1:59 Adam Thornton
2020-04-25  2:37 ` Charles Anthony
2020-04-25  2:47   ` Adam Thornton
2020-04-25  2:51     ` Rob Pike
2020-04-25  2:54       ` Rob Pike
2020-04-25  3:04         ` Larry McVoy
2020-04-25  3:30           ` Clem Cole
2020-04-25  3:43             ` Larry McVoy
2020-04-25  3:54               ` Jon Steinhart
2020-04-25 11:44                 ` Michael Kjörling
2020-04-25 13:17             ` Dan Cross
2020-05-11  0:28         ` scj
2020-05-11  0:32           ` Rob Pike
2020-05-11  0:57             ` Larry McVoy
2020-05-11 17:32               ` Greg A. Woods
2020-05-11 18:25                 ` Paul Winalski
2020-05-11 18:37                   ` Clem Cole
2020-05-11 19:12                     ` Paul Winalski
2020-05-11 19:57                       ` joe mcguckin
2020-05-11 20:25                         ` Larry McVoy
2020-05-12 17:23                           ` Paul Winalski
2020-05-12 17:35                             ` ron
2020-05-12 17:42                               ` Larry McVoy
2020-05-12 18:36                               ` Paul Winalski
2020-05-13 23:36                             ` Dave Horsfall
2020-05-14  0:42                               ` John P. Linderman
2020-05-14  2:44                                 ` Rich Morin
2020-05-14  3:09                                   ` Charles Anthony
2020-05-14 12:27                                     ` ron
2020-05-14 12:27                                     ` ron
2020-05-14 12:27                                     ` ron
2020-05-14  7:38                                   ` Dave Horsfall
2020-05-14 12:25                                     ` ron
2020-05-14 17:13                                   ` Paul Winalski
2020-05-14 17:21                                 ` Larry McVoy
2020-05-17 16:34                                   ` Derek Fawcus
2020-05-14  4:21                               ` Greg A. Woods
2020-05-14  4:40                                 ` Warner Losh
2020-05-14 17:32                               ` Larry McVoy
2020-05-14 22:32                                 ` Tony Finch
2020-05-16 23:53                                   ` Steffen Nurpmeso
2020-05-17  0:35                                     ` Larry McVoy
2020-05-11 18:37                   ` Larry McVoy
2020-05-11  2:08           ` Lawrence Stewart
2020-05-11 11:36           ` Michael Kjörling
2020-04-25  3:37       ` Dave Horsfall
2020-04-27 13:19       ` Tony Finch
2020-04-25  2:50   ` Adam Thornton
2020-04-25  5:59     ` Lars Brinkhoff

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=CMM.0.95.0.1589588129.beebe@gamma.math.utah.edu \
    --to=beebe@math.utah.edu \
    --cc=tuhs@minnie.tuhs.org \
    /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).