Re: which of these 3 casts would you prefer?

From	Miles Bader <miles@gnu.org>
Newsgroups	comp.lang.c++
Subject	Re: which of these 3 casts would you prefer?
Date	2011-09-03 18:26 +0900
Message-ID	<87wrdqj7sj.fsf@catnip.gol.com> (permalink)
References	(4 earlier) <slrnj5g3t6.gtj.grahn+nntp@frailea.sa.invalid> <8762ld6v5c.fsf@catnip.gol.com> <slrnj5vnhq.gtj.grahn+nntp@frailea.sa.invalid> <50c94a43-f3d3-4dd4-b22b-b4a95c463c54@w22g2000prj.googlegroups.com> <06c3c3f9-7291-4e9c-a8d0-a89f4a555c34@en1g2000vbb.googlegroups.com>

Show all headers | View raw

gwowen <gwowen@gmail.com> writes:
>> I seem to recall some gcc command line option which is on by default
>> to disable warnings for system headers.
>
> Unsuprisingly, its -Wno-system-headers, and as you say, the default is
> to suppress them.

Nonetheless, I still get tons of warnings from stuff in /usr/include,
even with -Wno-system-headers, mostly from 3rd party libraries
(typically C libraries -- which of course have no choice what type of
cast to use -- but also some C++ libraries...).

I'm not sure how it gcc distinguishes "system headers" though; the above
suggests it's not simply a test for a "/usr/include" prefix...

An instance where I get these warnings even from bona-fide system
headers is where the cast is present in a macro expansion.  E.g.,
<sys/mman.h> defines MAP_FAILED to be ((void *) -1).

-Miles

-- 
Somebody has to do something, and it's just incredibly pathetic that it
has to be us.  -- Jerry Garcia

Thread

which of these 3 casts would you prefer? "A" <a@a.a> - 2011-08-25 23:58 +0200
  Re: which of these 3 casts would you prefer? Andrey Tarasevich <andreytarasevich@hotmail.com> - 2011-08-25 16:19 -0700
  Re: which of these 3 casts would you prefer? Robert Wessel <robertwessel2@yahoo.com> - 2011-08-25 18:59 -0500
  Re: which of these 3 casts would you prefer? "Alf P. Steinbach" <alf.p.steinbach:usenet@gmail.com> - 2011-08-26 08:02 +0200
  Re: which of these 3 casts would you prefer? "Duga Chernobyl" <duga_c3@gmx.com> - 2011-08-26 10:05 +0200
    Re: which of these 3 casts would you prefer? "A" <a@a.a> - 2011-08-26 14:40 +0200
      Re: which of these 3 casts would you prefer? Leigh Johnston <leigh@i42.co.uk> - 2011-08-26 13:59 +0100
      Re: which of these 3 casts would you prefer? "Duga Chernobyl" <duga_c3@gmx.com> - 2011-08-26 15:19 +0200
        Re: which of these 3 casts would you prefer? Jorgen Grahn <grahn+nntp@snipabacken.se> - 2011-08-26 21:27 +0000
          Re: which of these 3 casts would you prefer? "Alf P. Steinbach" <alf.p.steinbach:usenet@gmail.com> - 2011-08-27 01:28 +0200
          Re: which of these 3 casts would you prefer? "Duga Chernobyl" <duga_c3@gmx.com> - 2011-08-27 10:23 +0200
            Re: which of these 3 casts would you prefer? Jorgen Grahn <grahn+nntp@snipabacken.se> - 2011-08-27 12:10 +0000
          Re: which of these 3 casts would you prefer? RaZiel <raziel_206_@hotmail.com> - 2011-08-27 21:55 +0200
          Re: which of these 3 casts would you prefer? Miles Bader <miles@gnu.org> - 2011-09-01 08:03 +0900
            Re: which of these 3 casts would you prefer? BGB <cr88192@hotmail.com> - 2011-08-31 23:11 -0700
            Re: which of these 3 casts would you prefer? Jorgen Grahn <grahn+nntp@snipabacken.se> - 2011-09-01 19:34 +0000
              Re: which of these 3 casts would you prefer? Joshua Maurice <joshuamaurice@gmail.com> - 2011-09-01 15:37 -0700
                Re: which of these 3 casts would you prefer? gwowen <gwowen@gmail.com> - 2011-09-02 00:30 -0700
                Re: which of these 3 casts would you prefer? Miles Bader <miles@gnu.org> - 2011-09-03 18:26 +0900
      Re: which of these 3 casts would you prefer? Edek <edek.pienkowski@gmail.com> - 2011-08-26 15:29 +0200
      Re: which of these 3 casts would you prefer? BGB <cr88192@hotmail.com> - 2011-08-27 09:35 -0700
        Re: which of these 3 casts would you prefer? Juha Nieminen <nospam@thanks.invalid> - 2011-08-27 18:38 +0000
          Re: which of these 3 casts would you prefer? Noah Roberts <roberts.noah@gmail.com> - 2011-08-27 12:32 -0700
            Re: which of these 3 casts would you prefer? BGB <cr88192@hotmail.com> - 2011-08-27 14:51 -0700
              Re: which of these 3 casts would you prefer? Jorgen Grahn <grahn+nntp@snipabacken.se> - 2011-08-29 14:10 +0000
                Re: which of these 3 casts would you prefer? BGB <cr88192@hotmail.com> - 2011-08-30 07:23 -0700
                Re: which of these 3 casts would you prefer? Jorgen Grahn <grahn+nntp@snipabacken.se> - 2011-09-11 20:24 +0000
                Re: which of these 3 casts would you prefer? BGB <cr88192@hotmail.com> - 2011-09-16 19:11 -0700
            Re: which of these 3 casts would you prefer? Jorgen Grahn <grahn+nntp@snipabacken.se> - 2011-08-29 11:32 +0000
          Re: which of these 3 casts would you prefer? BGB <cr88192@hotmail.com> - 2011-08-27 14:37 -0700
            Re: which of these 3 casts would you prefer? Ian Collins <ian-news@hotmail.com> - 2011-08-28 10:06 +1200
              Re: which of these 3 casts would you prefer? BGB <cr88192@hotmail.com> - 2011-08-27 15:27 -0700
                Re: which of these 3 casts would you prefer? Ian Collins <ian-news@hotmail.com> - 2011-08-28 10:47 +1200
                Re: which of these 3 casts would you prefer? Noah Roberts <roberts.noah@gmail.com> - 2011-08-27 15:42 -0700
                Re: which of these 3 casts would you prefer? Nobody <nobody@nowhere.com> - 2011-08-28 04:15 +0100
            Re: which of these 3 casts would you prefer? Noah Roberts <roberts.noah@gmail.com> - 2011-08-27 15:52 -0700
              Re: which of these 3 casts would you prefer? BGB <cr88192@hotmail.com> - 2011-08-28 01:54 -0700
                Re: which of these 3 casts would you prefer? Keith H Duggar <duggar@alum.mit.edu> - 2011-09-04 19:16 -0700
            Re: which of these 3 casts would you prefer? Juha Nieminen <nospam@thanks.invalid> - 2011-08-29 18:16 +0000
              Re: which of these 3 casts would you prefer? Noah Roberts <roberts.noah@gmail.com> - 2011-08-29 16:35 -0700
                Re: which of these 3 casts would you prefer? Nobody <nobody@nowhere.com> - 2011-08-30 04:13 +0100
                Re: which of these 3 casts would you prefer? Juha Nieminen <nospam@thanks.invalid> - 2011-08-30 06:03 +0000
              Re: which of these 3 casts would you prefer? BGB <cr88192@hotmail.com> - 2011-08-30 07:12 -0700
                Re: which of these 3 casts would you prefer? Juha Nieminen <nospam@thanks.invalid> - 2011-08-31 06:16 +0000
                Re: which of these 3 casts would you prefer? BGB <cr88192@hotmail.com> - 2011-09-01 03:05 -0700
                Re: which of these 3 casts would you prefer? Juha Nieminen <nospam@thanks.invalid> - 2011-09-01 07:00 +0000
                Re: which of these 3 casts would you prefer? BGB <cr88192@hotmail.com> - 2011-08-31 13:21 -0700
          Re: which of these 3 casts would you prefer? Jorgen Grahn <grahn+nntp@snipabacken.se> - 2011-08-28 19:30 +0000
      Re: which of these 3 casts would you prefer? Noah Roberts <roberts.noah@gmail.com> - 2011-08-27 12:19 -0700
        Re: which of these 3 casts would you prefer? Dombo <dombo@disposable.invalid> - 2011-08-28 12:08 +0200
        Re: which of these 3 casts would you prefer? Jorgen Grahn <grahn+nntp@snipabacken.se> - 2011-08-28 19:44 +0000
          Re: which of these 3 casts would you prefer? Noah Roberts <roberts.noah@gmail.com> - 2011-08-28 13:41 -0700
    Re: which of these 3 casts would you prefer? Anand Hariharan <mailto.anand.hariharan@gmail.com> - 2011-08-26 07:30 -0700

csiph-web