[CMake] Unknown generator output with CMake

[Jeandet Alexis]

Hi,

I play with CMake on PythonQt build. I faced a chalenge:

PythonQt is composed of:
	1)The generator which wrap Qt api(parses Qt sources to produce
cpp/python wrappers)
	2)The Lib (main engine)
	3)The wrappers generated by 1)

The chalenge was to build in this order:
	1) build generator
	2) generate from generator wrappers 
	3) build Lib
	4) build wrappers

My issue was to build wrappers from generator output since I can't
predict how many files it will produce. And what I understood is that
Glob can only be used at config time and I cant use *.cpp as sources.

So my basic solution was to build generator and call it at config time
using ExternalProject and execute_process:
https://github.com/jeandet/PythonQt/blob/cmake-clean/cmake/generated_cp
p.cmake
Then build src and wrapper normally.
I'm a CMake beginner but I feel that this solution is ugly and it slows
down config time.

Did I miss something? 

Best regards,
Alexis.
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