[ofw] Re: [ofa-general] Issues with _osm_lin_fwd_tbl

[Hal Rosenstock]

On Thu, 2008-06-12 at 13:50 +0300, Leonid Keller wrote:
> One can use zero-sized arrays as a structure member, having disabled the
> warning 4200.
> Here is a real example from hw\mlx4\kernel\bus\core\cache.c:
> 
> 	#pragma warning( disable : 4200)
> 	struct ib_pkey_cache {
> 		int             table_len;
> 		__be16          table[0];
> 	};
> 	#pragma warning( default  : 4200)

So to use this with Windows, any zero size array needs to be surrounded
by the pragma pair ?

-- Hal

> > -----Original Message-----
> > From: ofw-bounces at lists.openfabrics.org 
> > [mailto:ofw-bounces at lists.openfabrics.org] On Behalf Of Hal Rosenstock
> > Sent: Thursday, June 12, 2008 1:17 PM
> > To: Sasha Khapyorsky
> > Cc: ofw at lists.openfabrics.org; Vincent Ficet; 
> > general at lists.openfabrics.org
> > Subject: [ofw] Re: [ofa-general] Issues with _osm_lin_fwd_tbl
> > 
> > On Thu, 2008-06-12 at 13:00 +0300, Sasha Khapyorsky wrote:
> > > On 16:51 Wed 11 Jun     , Vincent Ficet wrote:
> > > >
> > > > Also, could anyone explain why the osm_lin_fwd_tbl_t is 
> > declared as
> > > > follows:
> > > >
> > > > typedef struct _osm_lin_fwd_tbl {
> > > >    uint16_t size;
> > > >    uint8_t port_tbl[1];
> > > > } osm_lin_fwd_tbl_t;
> > > 
> > > AFAIR the reason is a poor windows compiler which doesn't support 
> > > array[0] like definitions in structures.
> > 
> > Yes, I too recall something being said along those lines 
> > quite a while ago.
> > 
> > Is this accurate ? If so, is this still a restriction of the 
> > Windows compilers in use (as I think the build environment 
> > and perhaps the compilers have changed quite a bit since 
> > then) ? Can someone knowledgeable in Windows comment on this ?
> > 
> > -- Hal
> > 
> > > Sasha
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