On Wed, Feb 28, 2018 at 09:37:09AM +0100, Arnd Bergmann wrote: > On Wed, Feb 28, 2018 at 3:06 AM, Richard Kuo <r...@codeaurora.org> wrote: > > On Thu, Feb 22, 2018 at 11:43:10PM +0100, Arnd Bergmann wrote: > >> - How do I build an llvm based toolchain for Hexagon? Do I need patches > >> on top of the llvm-6 release branch? Where can I find the corresponding > >> binutils-2.30 sources? > > > > Just to follow up on this, the closest thing right now to compile the kernel > > for Hexagon is the toolchain included with the Hexagon SDK. However, the > > linker will fail because of something in the kernel build process that > > I think produces empty sections, which that linker can't handle. A newer > > linker can handle it, but that's not scheduled to be released until much > > later > > this year. > > > > That's actually the closest option currently. I tried the upstream source > > but it seems to lack some specific patches to support kernel compilation, > > so I will need to chase those down. > > Thanks for trying it out. Can you point me to the sources? I tried downloading > a Hexagon SDK when I first looked at it, but only got a huge chunk of binary > java files and gave up before finding the llvm patches.
I don't think the SDK patches are available externally. The good news is I think we're now one patch away from the upstream LLVM compiling a functional kernel for Hexagon (a few fixes to LLVM/clang have been committed already). It technically compiles but produces an abort (from a null deref) which the linker doesn't like. The linker itself unfortunately is going to be a different matter. Thanks, Richard Kuo -- Employee of Qualcomm Innovation Center, Inc. Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project