[CMake] Detecting MinGW MSYS or Cygwin unix style file system

[Brandon J. Van Every]

David Cole wrote:

> To me, the very fact that you are targeting Windows indicates that a  
> *default* value of "C:/Program Files" is entirely appropriate. 

Plainly, MSYS is not "Windows," it is a Unix lookalike.  No different in 
principle than Cygwin shell and filesystem.  You are familiar with 
those, right?  Pathnames go /// instead of the usual Windows \\\, 
everything is /usr/bin and so forth, all standard Unix tools are present 
and accounted for....

> I would argue that most  folks are building Windows targeted projects, 
> not MSYS targeted  projects...
>
That misses the point.  MSYS users are building MSYS projects, just like 
any other Unix source code build.

Do not confuse MinGW for MSYS.  MinGW is a compiler.  MSYS is an OS 
environment.


Cheers,
Brandon Van Every