[CMake] Secret precompiled header support?

[Bill Hoffman]

On 5/14/2012 2:26 PM, Robert Dailey wrote:
> No one has anything to say about this?
>     CMake seems to do more than just add them as general compiler flags,
>     it seems to know exactly which attributes in the VCPROJ XML are
>     mapped to their respective command line alternatives, and uses the
>     appropriate ones. If this is true, why do we not have a dedicated
>     target & source file property that I can use to enable precompiled
>     headers instead of using these command line strings directly? Am I
>     misunderstanding something?
>
Nothing magic going on.  With VS 2010 and greater, there is a python 
script that creates a flag mapping table from MS xml:

http://cmake.org/gitweb?p=cmake.git;a=blob;f=Source/cmparseMSBuildXML.py;h=4877e5913436dcf117580db286566b4f9568fc20;hb=HEAD
cmparseMSBuildXML.py

So, nothing specific was done for pre-compiled headers.  To have them 
work cross platform is very difficult because of the wide variety in API 
by the compilers out there.

-Bill