Re: boost::signals build and C++Builder 6 Pro in 1.29.0

From: Russell Hind (yg-boost-users_at_[hidden])
Date: 2003-03-05 14:22:34

Peter Dimov wrote:
>>
>>the program hangs.  Turning on CodeGuard shows a similar problem to
>>that
>>above.  The object was allocated with a size of 12 bytes, but code is
>>trying to access byte 16 in the object (I guess this is a similar
>>alignment problem).  The callstack is
>>
>>0041E44E boost::counted_base::dispose(this=:00C04360)
> 
> 
> counted_base::dispose() is an empty function, so this looks like a CodeGuard
> false alarm.
> 
> One possible reason for the real problem is runtime library mismatch between
> the signals library and your executable. counted_base contains a mutex in
> multithreaded builds.
> 
> 

You may well be correct here.  Stepping through the code with the debug 
version of the built library, shows that in slot.cpp line 44

         scoped_connection safe_connection(watch_bound_objects);

This creates a shared_count.  The shared_count doesn't create a mutex 
object (so I assume the library is being built without 
BOOST_HAS_THREADS.  When releasing the safe_connection, releasing the 
shared_count shows it to have a mutex (I guess because my program has 
multi-threading enabled.

Question is:  How do I force BOOST_HAS_THREADS with bjam to build the 
library with multi-threading?  I currently build the libraries using

bjam -sTOOLS=borland

Hope someone can help with this?

Thanks

Russell