Re: [Boost-users] [thread] Can't compile once.cpp for ppc in 1.54

Subject: Re: [Boost-users] [thread] Can't compile once.cpp for ppc in 1.54
From: Vicente J. Botet Escriba (vicente.botet_at_[hidden])
Date: 2013-08-20 01:57:11

Le 20/08/13 03:11, James Walker a écrit :
> On 8/3/2013 6:04 AM, Vicente J. Botet Escriba wrote:
>> Le 24/07/13 01:24, James Walker a écrit :
>>> Attempting to build the 1.54.0 version of the thread library for ppc
>>> on Mac OS X 10.6.8, using Apple's GCC 4.0, I get this error:
>>>
>>>
>>> boost_1_54_0/boost/atomic/detail/gcc-ppc.hpp: In member function 'bool
>>> boost::atomics::detail::base_atomic<T, int, 4u,
>>> Sign>::compare_exchange_strong(T&, T, boost::memory_order,
>>> boost::memory_order) volatile [with T = unsigned int, bool Sign =
>>> false]':
>>> /Volumes/Home/Mercurial/boost_1_54_0/boost/atomic/detail/gcc-ppc.hpp:1190: 
>>>
>>> error: impossible constraint in 'asm'
>>>
>>>
>>> If I use GCC 4.2, I don't get the error.  But I'm hesitant to use that
>>> compiler, because it usually produces code that won't run on G3's.
>> Hi,
>>
>> please, could you try to build defining BOOST_THREAD_DONT_USE_ATOMIC.
>
>
> Thanks, that does make the error go away.  Am I losing anything by 
> using this flag?  I couldn't find any documentation on it.

Hrr, I missed the documentation of this macro. I will add it for next 
release.

The implementation that uses Boost.Atomic fixes this ticket 
https://svn.boost.org/trac/boost/ticket/5752.

Best,
Vicente