HEAD does not validate on OS X

[Simon Marlow]

Manuel M T Chakravarty wrote:
> Simon Marlow:
>> Bryan O'Sullivan wrote:
>>> On Sat, Mar 14, 2009 at 5:32 PM, Manuel M T Chakravarty 
>>> <chak at cse.unsw.edu.au <mailto:chak at cse.unsw.edu.au>> wrote:
>>>    Compiling the latest HEAD on OS X, I get
>>>    RtsFlags.c: In function 'setupRtsFlags':
>>>    RtsFlags.c:1150:0:
>>>        error: '_SC_NPROCESSORS_CONF' undeclared (first use in this
>>>    function)
>>> Hmm. That should be using _SC_NPROCESSORS_ONLN, but it's a System V 
>>> extension that isn't supported by OS X. You'll have to conditionally 
>>> use sysctlbyname("hw.availcpu",...) if HW_AVAILCPU is defined when 
>>> <sys/sysctl.h> is included.
>>
>> Right, I used _SC_NPROCESSORS_CONF in the hope that it might be more 
>> portable.  Also, the ticket claimed that it would work on Mac OS X,
>>
>> http://hackage.haskell.org/trac/ghc/ticket/1741
> 
> Right.  The Apple man pages claim the same
> 
>   
> http://developer.apple.com/documentation/Darwin/Reference/ManPages/man3/sysconf.3.html 
> 
> 
> It also says that _SC_NPROCESSORS_ONLN is supported as well.
> 
> So, I had a look at unistd.h on Mac OS X.  It has
> 
>> #if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
>> #define    _SC_NPROCESSORS_CONF        57
>> #define    _SC_NPROCESSORS_ONLN        58
>> #endif /* !_POSIX_C_SOURCE || _DARWIN_C_SOURCE */
> 
> I guess we have _POSIX_C_SOURCE defined and _DARWIN_C_SOURCE not defined.

Aha!  The file containing the offending code has #include "PosixSource.h" 
at the top, which turns on _POSIX_C_SOURCE.  So the patch I'm testing right 
now should fix this, because I moved the code to another file that doesn't 
have #include "PosixSource.h".

Cheers,
	Simon