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Date: Fri, 28 Mar 2014 07:05:23 -0600
From: Eric Blake <eblake AT redhat DOT com>
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To: cygwin AT cygwin DOT com
Subject: Re: open(O_RDWR) and lseek() fail
References: <20140328093110 DOT GA23367 AT calimero DOT vinschen DOT de> <0D835E9B9CD07F40A48423F80D3B5A702CE06F27 AT USA7109MB022 DOT na DOT xerox DOT net>
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On 03/28/2014 06:53 AM, Nellis, Kenneth wrote:
> x.c:12:2: warning: format =E2=80=98%d=E2=80=99 expects argument of type =
=E2=80=98int=E2=80=99, but argument 2 has type =E2=80=98off_t=E2=80=99 [-Wf=
ormat=3D]
>=20
> So, then, after changing %d to %lld, gcc -Wall -pedantic complains:

My advice: You usually do NOT want to compile with -pedantic.  That
option exists for programs that are sticking _strictly_ to the C
standard, but lseek() and off_t are not part of the C standard.  There
is no portable way to be pedantic to the C89 standard and simultaneously
use 64-bit offsets.  The situation is better in C99, since that
introduced 64-bit types.

If you want to use %lld, you have to use C99, not C89; use gcc -std=3Dc99
or gcc -std=3Dgnu99.  By omitting -std, you got gcc's default, which for
now is still -std=3Dc89.

> Wondering how to printf an off_t value without the compiler complaining w=
hile
> using -Wall -pedantic.

You can't.  So drop the -pedantic.

--=20
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org


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