[LLVMdev] Suppressing cmake's LLVM_ENABLE_PIC for the Xcode generator

[Ray Fix]

Hi,

If you create an Xcode project with

     cmake -G Xcode ~/llvm

and do a build, you end up with 68 warnings like this:

  -mdynamic-no-pic overrides -fpic or -fPIC

This can be easily avoided doing:

   cmake -G Xcode -ULLVM_ENABLE_PIC ~/llvm

But I think it would be nicer if it built warning-free with the  
simpler form.




What do you think?

Ray

PS: CMake generated make style builds on Mac OS X don't use the - 
mdynamic-no-pic, so I guess you want -fPIC enabled there.
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