Re: [Boost-users] shared_array EXC_BAD_ACCESS

From: Christopher Hunt (huntc_at_[hidden])
Date: 2005-08-02 02:21:14

OK, this is now completely solved. :-)

Interestingly, boost/detail/lightweight_mutex.hpp was being included in 
one place and declaring lightweight_mutex from 
boost/detail/lwm_nop.hpp. However the implementation from 
boost/detail/lwm_pthreads.hpp was actually being used.

To cut a long story short, declaring a prefix file that forced boost to 
configure itself prior to importing Cocoa and Carbon dependencies 
completely solved the problem. Here's what my Cocoa pch file looks 
like:

//
// Prefix header for all source files
//

#ifdef __cplusplus
     #include <boost/config.hpp>
                                 // Gets brought in early so that any 
Carbon presence doesn't influence
                                 // its configuration.
#endif

#ifdef __OBJC__
     #import <Cocoa/Cocoa.h>
#endif

If you're doing just Carbon, then do your #include <Carbon/Carbon.h> 
after boost/config.hpp is included (in place of the #ifdef __OBJC__ 
block).

The real gremlin here is this bit of code in 
boost/config/platform/macos.hpp:

#  ifndef TARGET_CARBON
#     include <boost/config/posix_features.hpp>
#  endif

There is a posting that discusses the rationale of the above: 
http://lists.boost.org/boost-users/2004/10/8110.php and also makes the 
observation that there's probably a better way to check for MSL.

My recommendation is to check for the definition of __MSL__. Thus the 
above code becomes:

#  ifndef __MSL__
#     include <boost/config/posix_features.hpp>
#  endif

IMHO the existing MSL check is a bug (checking TARGET_CARBON is too 
broad) and will be a trap for all Cocoa/Carbon programmers wanting to 
use boost. I would also think that the reality now is that most people 
use xcode/gcc and not CodeWarrior/MSL (this is from someone who used to 
use CW and MSL all the time). Thus, the motivation for addressing the 
issue should now be high.

What needs to be done to fix the problem? I'm willing to help to save 
some other poor soul from spending a day or two stuffing around.

Cheers,
-C