Re: [boost] ARM platform: undefined reference to__sync_fetch_and_add_4

Rob Desbois:

If you can provide the ARM equivalent operation I would be extremely grateful, but I am unable to code it myself unfortunately.

I think that ARM (pre-v6) doesn't have an atomic fetch-and-add operation. It only has an atomic swap. We'll have to use a spinlock. It would be helpful if you can try whether libs/smart_ptr/test/spinlock_test.cpp from the current SVN trunk compiles and works for you.