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From: John Baldwin <jhb@freebsd.org>
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Date: Wed, 19 May 2010 09:15:12 -0400
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Cc: Gabor PALI <pgj@freebsd.org>, hackers@freebsd.org
Subject: Re: How to Include Headers for siginterrupt() and vsnprintf()
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On Wednesday 19 May 2010 6:52:04 am Gabor PALI wrote:
> Hello there,
> 
> I have some sources developed on non-FreeBSD systems (the sources of
> the run-time system for the Glasgow Haskell Compiler [1]) which try to
> #include signal.h to use siginterrupt() and stdio.h to use
> vsnprintf().  The problem is that they #define (or not) some constants
> which makes them hidden so the prototypes are not seen by the
> compiler.  How to cope with this kind of sources?  My naive solution
> is to do something like that (rts/posix/Signals.c):
> 
> #if defined(HAVE_SIGNAL_H)
> # if defined(freebsd_HOST_OS)
> extern int siginterrupt(int,int);
> # endif
> # include <signal.h>
> #endif
> 
> and that (rts/eventlog/EventLog.c):
> 
> #ifdef freebsd_HOST_OS
> int vsnprintf(char * __restrict, size_t, const char *
> __restrict,__va_list) __printflike(3, 0);
> #endif
> 
> 
> Thank you for the hints in advance.

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.

-- 
John Baldwin