[CMake] Secret precompiled header support?

[Robert Dailey]

On Mon, May 14, 2012 at 3:45 PM, Bill Hoffman <bill.hoffman at kitware.com>wrote:

> 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=**4877e5913436dcf117580db286566b**
> 4f9568fc20;hb=HEAD<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.


I'm seeing this behavior in VS 2003 and VS 2008 as well. Is the same script
used by CMake for these generators too? It's working somehow...
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