[CMake] Using regex in find_program

[Rodolfo Schulz de Lima]

There's a functionality that I'm missing in find_program(...). I must 
find an executable that matches a regex expression.

What I'm trying to achieve is find the name of a cross-compiler. It 
would be mingw32-gcc, i585-mingw32msvc-gcc, etc... so I would match 
".*mingw32.*-gcc". Is there any other way to do this?

Is it possible to extend find_program to cope with regexes? In my 
example, I would write:

find_program(PROG REGEX ".*mingw32.*-gcc")

The first matching program name (along with its path) would be returned. 
If there's enough consensus that this should be implemented, I'm willing 
to do this...

Regards,
rod