My test show that if you compile with clang, pass the '-pedantic' option, and also pass 'std=c++0x' or 'std=c++11', that the many warnings about variadic macro use do not show in the output. I know there was a discussion and an assertion that the warnings do show in the output oonce '-pedantic' is passed as a compiler option even though a 'std=xxx' is passed that covers variadic macros, but I am not seeing that in my tests. If anybody else can tell me of a Boost library build where clang is the compiler, 'pedantic' is passed, and the appropriate 'std=xxx' to cover variadic macro use is passed, and the clang compiler warnings about using variadic macros show up, it would be appreciated.