issue with clang and CPUTYPE native
Roman Divacky
rdivacky at freebsd.org
Thu Dec 30 18:44:45 UTC 2010
On Thu, Dec 30, 2010 at 06:40:48PM +0000, Alexander Best wrote:
> On Thu Dec 30 10, Roman Divacky wrote:
> > 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
>
> thanks. that worked. this is what clang detects as my cpu:
>
> -march=native
hm? are you sure it wrote -march=native? it should have written
"detected CPU = something"
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