issue with clang and CPUTYPE native

[Roman Divacky]

On Thu, Dec 30, 2010 at 12:20:33AM +0000, Alexander Best wrote:
> On Tue Dec 28 10, Roman Divacky wrote:
> > -march=native in clang works by detecting CPU name
> > and passing it (if found) to llvm. if the CPU is not
> > detected nothing is passed.
> > 
> > nocona is supported
> > 
> > ie. leaving the CPUNAME empty or specifying it to "nocona" should
> > be equivalent to setting it to "native".
> > 
> > 
> > can you apply this patch:
> > 
> > Index: Driver/Tools.cpp
> > ===================================================================
> > --- Driver/Tools.cpp	(revision 122591)
> > +++ Driver/Tools.cpp	(working copy)
> > @@ -684,6 +684,7 @@
> >        // FIXME: We should also incorporate the detected target features for use
> >        // with -native.
> >        std::string CPU = llvm::sys::getHostCPUName();
> > +      llvm::outs() << "detected CPU = " << CPU << "\n";
> >        if (!CPU.empty())
> >          CPUName = Args.MakeArgString(CPU);
> >      } else
> 
> thanks a lot for the patch. i've applied it, but am not sure how to only
> compile clang. 'make' in usr.bin/clang fails. do i have to run target
> buildworld  or is there a way to only build clang?

I would guess that cd lib/clang && make && cd ../../usr.bin/clang && make
should work, if not - full buildworld is necessary I guess