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From: John Baldwin <jhb@freebsd.org>
To: Gabor PALI <pgj@freebsd.org>
Date: Thu, 20 May 2010 09:30:56 -0400
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Cc: hackers@freebsd.org
Subject: Re: How to Include Headers for siginterrupt() and vsnprintf()
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On Thursday 20 May 2010 7:33:52 am Gabor PALI wrote:
> Hi,
> 
> On 05/19/10 15:15, John Baldwin wrote:
> > What do they do to hide the prototypes?  Do they set a specific version of 
> > POSIX or ISO C that they wish to use?  Probably the code should not be 
doing 
> > that
> 
> There is a file (rts/PosixSource.h) which does this:
> 
> #define _POSIX_SOURCE   1
> #define _POSIX_C_SOURCE 199506L
> #define _XOPEN_SOURCE   500
> #define _ISOC99_SOURCE
> 
> 
> The comment in the file says: "Include this file into sources which
> should not need any non-Posix services.  That includes most RTS C sources."

Ok, well their code is broken.  They claim they only use POSIX interfaces from 
a certain date and those are older than vsnprintf().

Ah, so we do not honor _ISOC99_SOURCE in <sys/cdefs.h>  Instead, the POSIX 
version they specify implies C90.

Looks like this is just busted code given this thread:

http://www.mail-archive.com/freebsd-current@freebsd.org/msg53882.html

If they want C99, then they should use POSIX 2001, not 1995.

-- 
John Baldwin