From mint-bounce@lists.fishpool.fi  Sun May 24 17:30:33 2009
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Date: Sun, 24 May 2009 23:27:47 +0200
From: =?windows-1252?Q?Vincent_Rivi=E8re?= <vincent.riviere@freesbee.fr>
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CC: Miro Kropacek <miro.kropacek@gmail.com>
Subject: Re: [MiNT] anonymous structs and C99
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Hello.

That kind of syntax is a Microsoft extension ;-)
You can use it along with -std=c99 if you add -fms-extensions
Well, if you want to be standard compliant, it is not a good idea.

You should have noticed the warning :
a.c:52: warning: declaration does not declare anything

In C99, your union is only a new type, but it is unused since you didn't 
declare a variable.

The solution is:

struct xxx
{
   int x;
   int y;
   union
   {
     char* pointer1;
     int* pointer2;
   } u; // HERE
} a;

Then you can use a.u.pointer1
Of course, no cast is required !

--
Vincent Rivière