Re: [boost] Building on OS X

From: Jesse Jones (jesjones_at_[hidden])
Date: 2001-11-08 13:17:42

At 9:51 AM -0500 11/8/01, Howard Hinnant wrote:
>On Thursday, November 8, 2001, at 07:29  AM, Peter Dimov wrote:
>
>>  From: "Darin Adler" <darin_at_[hidden]>
>>>  I'll fix this. The simplest fix is probably to add an unconditional
>  >> BOOST_HAS_THREADS define to metrowerks.hpp. This makes it clear that
>>>  CodeWarrior is effectively always in "multi-threaded mode".
>>
>>  Is it? Even on Win32, or Playstation 2, or whatever other platforms CW
>>  targets?
>
>For the C and C++ libs to be in "multi-threaded mode", "multi-threaded
>mode" _MWMT must be defined to 1.  This can be done either in a prefix
>file (included before any other header), or in ansi_prefix.XXX.h (XXX ==
>mac on Mac OS, win32 on windows, etc.).

And according to the comment in <mslconfig> you have to rebuild the 
C++ library if you toggle this switch. Pretty nasty surprise for 
someone wanting to use pthreads on OS X. I looked through the 
Targeting Mac OS document and the release notes and didn't see any 
mention of any of this. Nor do I remember anything from the newsgroup 
(just discussions about whether the allocators are thread safe which 
they are because they call thru to BSD's malloc on Mach).

I'm not sure what the best way to handle this with boost is. Maybe 
arrange for <ansi_prefix.mac.h> to be included and define 
BOOST_HAS_THREADS if both _MWMT  and __MACH__ are 1. People who don't 
want to touch <ansi_prefix.mac.h> can still define _MWMT on the 
command line. (BTW __MACH__ is documented, but in the Targeting Mac 
OS help, not the Compiler help).

   -- Jesse