Users of GCC shouldn't have to wonder whether they should use the gcc

toolset (obvious; it's the name of the compiler like all the other

toolsets) or the darwin toolset (non-obvious: it's the name of the OS,

sorta, and it's not unlikely that we'll have toolsets for OSes someday

-- think cross-compilation).  It's just confusing.  I don't care how

the code is organized; this is a user-interface issue.