[CMake] Suggestion for CMake platform/compiler detection

[Sylvain Benner]

> Yep but this is the problem...
> it cannot be made of small patches, how can you integrate a kind of 
> inheritance system with small patches to CMake? It changes the API...

I'm not sure to understand what you call "inheritance system".
There is already an inheritance system in CMake.
For instance, here we have a top level CMakeLists.txt and all CMakeLists 
project actually inherite already from the top level settings with the 
ADD_SUBDIRECTORY() command. If needed, the low level CMakeLists can override 
the inherited settings.

So can you explain what do you mean by "inheritance system" please ?

Sylvain