GDB on Mac OS

[Joel Brobecker]

> Does that apply to LLVM warnings, too?  There are a whole lot of
> those.  Some are caused by sending GCC options to the compiler that
> LLVM doesn’t understand, in spite of the fact that it proclaims itself
> as GCC.  It seems that configure will need to be able to tell the
> difference and avoid triggering those LLVM incompatibilities.

I'm not sure about LLVM. I *think* that we're only aiming for
warning-free with GCC.

-- 
Joel