cmake BOOST_LOG_HAS_LOCK_FREE_ATOMIC_INT32 examples

Jackarain/proxy third_party/boost/libs/log/CMakeLists.txt :52

check_cxx_source_compiles("#include <${CMAKE_CURRENT_SOURCE_DIR}/config/atomic-int32/atomic_int32.cpp>" BOOST_LOG_HAS_LOCK_FREE_ATOMIC_INT32)