Re: [Boost-users] undefined references '__sync_fetch_and_add_4 'for Boost_1_39_0 on Alpha platform

Yan Wu wrote:

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Yes. To disable shared_ptr's use of these intrinsics, #define BOOST_SP_USE_PTHREADS.

Thanks for your kindly replies. It's a little difficult to implement the atomic operations by myself;-) Where should the macro BOOST_SP_USE_PTHREADS be defined ? Which file in boost or the file in my comphelper.cxx?

You need to define it in each cpp/cxx file that uses shared_ptr. The safest way to do that is to define it globally for the project by, for example, adding -DBOOST_SP_USE_PTHREADS to the build flags.