Michael,
        the best, long term engineering solution, is to rely on the gcc __sync 
primatives.   Whether there any intermediate steps along the way is debatable.  
 Discuss
Dave

On 14 Nov 2010, at 22:26, Michael Hope wrote:

> Hi there.  I've been looking into updating the QT4 atomic operations
> as an alternative to working around it in GCC.  There's ARM specific
> code in:
> http://qt.gitorious.org/qt/qt/blobs/4.7/src/corelib/arch/qatomic_armv6.h
> that should be updated to include IT instructions so that it can
> compile in Thumb-2 mode.
> 
> There are bigger problems here though:
> * There's code in corelib/arch/armv6/qatomic*.c that may also being used
> * qatomic_armv6.h includes code for RVCT which should be updated for
> Thumb-2 by someone
> * The code may not work on multi-processor systems like Panda due to
> the lack of DMB instructions
> 
> The better fix would be to replace everything with __sync_* primitives
> similar to qatomic_avr32.h and require GCC 4.4 or higher.  The same
> probably applies to glib.
> 
> Thoughts?  Any volunteers?  It's mildly outside the Toolchain WG's mandate.
> 
> See also:
> https://bugs.launchpad.net/ubuntu/+source/qt4-x11/+bug/673085
> 
> -- Michael
> 
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