Bijan
Adam Merz
writes: I don't think define=arch:SSE2 has the effect you think it does; rather, I believe what you want is cxxflags="-arch:SSE2". Also note that -arch has no effect on 64-bit compilations, so it can be ommitted from the address- model=64 bjam invocations.
I thought "define" was more generic and applicable for both of C and C++ code (cflags and cxxflags).
According to http://tinyurl.com/6zeyhu, cflags affects both the C and C++ compilers, while cxxflags affects only the C++ compiler; I use cxxflags as a matter of habit, but in the case of -arch, I suppose cflags would be more appropriate (although I'm not aware of any C code inside of Boost anyway). define creates macro definitions (i.e., /D for MSVC; http://tinyurl.com/6aku5f), and so is suitable for defining _SECURE_SCL, but not for specifying -arch to the compiler.