__sync_fetch_and_add

/usr/include/c++/4.4/ext/atomicity.h(46): error: identifier "__sync_fetch_and_add" is undefined
/usr/include/c++/4.4/ext/atomicity.h(50): error: identifier "__sync_fetch_and_add" is undefined

symptoms: #include <iostream> and using gcc 4.4
solution: AFAIK, do upgrade your gcc, or do not use iostream header.. 😀

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