Re: Gist does not build with VC++ anymore - Mailing list pgsql-hackers

From Bruce Momjian
Subject Re: Gist does not build with VC++ anymore
Date
Msg-id 200606250103.k5P139p17054@momjian.us
Whole thread Raw
In response to Re: Gist does not build with VC++ anymore  ("Magnus Hagander" <mha@sollentuna.net>)
List pgsql-hackers
Patch applied.  It seems offsetof() can only find structure members in
MSVC, not the offset of array elements in structures.  Anyway,
offsetof() was finding the first element, so the "[0]" is not needed.

---------------------------------------------------------------------------

Magnus Hagander wrote:
> > > I've updated my VC++ build env with latest CVS, and it no longer 
> > > builds because of changes to GIST:
> > > 
> > > src\backend\access\gist\gistutil.c(237) : error C2057: 
> > > expected constant expression
> > > src\backend\access\gist\gistutil.c(237) : error C2466: 
> > cannot allocate 
> > > an array of constant size 0
> > > src\backend\access\gist\gistutil.c(237) : error C2133: 'storage' :
> > > unknown size
> > > 
> > > 
> > > The problem appears to come from:
> > > #define GEVHDRSZ    (offsetof(GistEntryVector, vector[0]))
> > > 
> > > Which can't be used in this context. 
> > > 
> > > What would be the proper fix for that?
> > 
> > Hmm. Now that I look at it more clearly, it seems Hiroshi has 
> > a fix for this in his submitted patch (that still had a lot 
> > of other problems in the rest of it). I'm not sure if it's 
> > the proper fix, but it's there.
> 
> While I'm spamming everybody anyway, here's another thing that might fix
> it? This one compiles and tests, and I *think* it does the right
> thing... If it's correct, I think it looks like a cleaner solution.
> 
> //Magnus
> 
> 
> RCS file: /projects/cvsroot/pgsql/src/include/access/gist.h,v
> retrieving revision 1.52
> diff -c -r1.52 gist.h
> *** src/include/access/gist.h   5 Mar 2006 15:58:53 -0000       1.52
> --- src/include/access/gist.h   24 Jun 2006 17:20:28 -0000
> ***************
> *** 142,148 ****
>         GISTENTRY       vector[1];
>   } GistEntryVector;
> 
> ! #define GEVHDRSZ      (offsetof(GistEntryVector, vector[0]))
> 
>   /*
>    * macro to initialize a GISTENTRY
> --- 142,148 ----
>         GISTENTRY       vector[1];
>   } GistEntryVector;
> 
> ! #define GEVHDRSZ      (offsetof(GistEntryVector, vector))
> 
>   /*
>    * macro to initialize a GISTENTRY
> 
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--  Bruce Momjian   bruce@momjian.us EnterpriseDB    http://www.enterprisedb.com
 + If your life is a hard drive, Christ can be your backup. +


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