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Re: Bug in +[NSError _lastError] ?


From: David Chisnall
Subject: Re: Bug in +[NSError _lastError] ?
Date: Wed, 29 Feb 2012 10:38:55 +0000

Note that this will break on any non-GNU platform, where the standards are 
actually implemented even if _GNU_SOURCE is defined.  The correct test is 
probably #if __GNU__ or __glibc__.  I think in Étoilé we have a 
__drepper_can_not_read_standards__ macro for cases like this.

David

On 29 Feb 2012, at 00:56, Jens Alfke wrote:

> 
> On Feb 28, 2012, at 4:43 PM, I wrote:
> 
>> I’m not sure what the best way is to fix this. It looks like one could 
>> either add
>>      #undef _GNU_SOURCE
>> near the top of the file where it defines _XOPEN_SOURCE; or one could use an 
>> #if around the call to strerror_r to call either version depending on which 
>> one is available.
>> 
>> For now I’m going to try the first option since it’s simpler.
> 
> That didn’t work, because “common.h” both defines _GNU_SOURCE and ends up 
> including <string.h> so the GNU version of strerror_r is already declared. So 
> I went with the second option, which was pretty easy.
> 
> I’ll get around to formally submitting a patch once I’ve got more stuff 
> working, but here’s a diff showing what I did:
> 
> Index: Source/Additions/NSError+GNUstepBase.m
> ===================================================================
> --- Source/Additions/NSError+GNUstepBase.m    (revision 34837)
> +++ Source/Additions/NSError+GNUstepBase.m    (working copy)
> @@ -130,12 +130,17 @@
> 
>   /* FIXME ... not all are POSIX, should we use NSMachErrorDomain for some? */
>   domain = NSPOSIXErrorDomain;
> +#if _GNU_SOURCE
> +  message = [NSString stringWithCString: strerror_r(code, buf, BUFSIZ)
> +                            encoding: [NSString defaultCStringEncoding]];
> +#else
>   if (strerror_r(code, buf, BUFSIZ) < 0)
>     {
>       snprintf(buf, sizeof(buf), "%ld", code);
>     }
>   message = [NSString stringWithCString: buf
>                              encoding: [NSString defaultCStringEncoding]];
> +#endif
>   /* FIXME ... can we do better localisation? */
>   info = [NSMutableDictionary dictionaryWithObjectsAndKeys:
>     message, NSLocalizedDescriptionKey,
> 
> 
> 
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