[CMake] MinGW detection question

[E. Wing]

> CMake assumes the environment is setup to work.  Just like with visual
> studio, you have to run vcvars.bat.  Basically, cmake expects a working
> compiler, and can not modify the PATH. It can not modify the PATH
> because it won't be around when make is actually run.

Actually, CMake did an excellent job building stuff without this in my
PATH. Once I told CMakeSetup (manually) where the make program was,
everything just worked. I presumed it was because you use explicit
paths to everything to begin with. So all I needed was some other
environmental variable to clue CMakeSetup about where the make program
was, and things would be good.

Also, I haven't needed vcvars.bat for Visual Studio. I never heard of
it until now. I assumed that was because Visual Studio totally messed
with my registry and system and CMake already knows how to deal with
that.

Thanks,
Eric