Date: Fri, 16 Dec 2005 06:22:24 -0700
From: Matthew Wilcox <matthew@wil.cx>
To: Denis Vlasenko <vda@ilport.com.ua>
Cc: Neil Brown <neilb@suse.de>, Steven Rostedt <rostedt@goodmis.org>,
       linas <linas@austin.ibm.com>, linux-kernel@vger.kernel.org,
       bluesmoke-devel@lists.sourceforge.net,
       linux-pci@atrey.karlin.mff.cuni.cz, johnrose@austin.ibm.com,
       linuxppc64-dev@ozlabs.org, Paul Mackerras <paulus@samba.org>,
       Greg KH <greg@kroah.com>
Subject: Re: typedefs and structs [was Re: [PATCH 16/42]: PCI:  PCI Error reporting callbacks]
Message-ID: <20051216132224.GD2361@parisc-linux.org>
References: <20051103235918.GA25616@mail.gnucash.org> <1131412273.14381.142.camel@localhost.localdomain> <17263.64754.79733.651186@cse.unsw.edu.au> <200512161509.01580.vda@ilport.com.ua>
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On Fri, Dec 16, 2005 at 03:09:01PM +0200, Denis Vlasenko wrote:
> 
> Forward decl for typedef works too:
> 
> typedef struct foo foo_t;
> 
> is ok even before struct foo is defined. Not sure that standards
> allow thing, but gcc does.

Forward declarations of typedefs don't work in at least one case that
do for struct definitions:

$ cat foo.c
typedef struct foo foo_t;
typedef struct foo foo_t;
$ gcc -Wall -o foo.o -c foo.c
foo.c:2: error: redefinition of typedef 'foo_t'
foo.c:1: error: previous declaration of 'foo_t' was here

and if you don't believe we do that, take another look at our headers
sometime.
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