[cfe-dev] CPU features handling

[Roman Divacky]

Hi,

Clang currently maintains its own knowledge of cpu features. See 
clang/lib/Basic/Targets.cpp:getDefaultFeatures() and setFeatureEnabled().

This knowledge is already and better maintained in Target specific .td
files (e.g. Target/X86/X86.td).

I would like to make clang use the information provided by llvm, the question
is how. I think that the best would be to let clang see FeatureKV[] and 
SubTypeKV[] from *GenSubtarget.inc (e.g. Target/X86/X86GenSubtarget.inc).

I am not sure how to do it though. Can you comment on what you think is
the best way to tackle this? We cant link libclangBasic to libLLVMTarget
and it seems strange to copy the *GenSubtarget.inc to libBasic. I cant
think of any other solution

thank you

Roman
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