Well I found and old post by John Criswell describing how he did his dissertation project SVA. He didn't use LTO but llvm-link. So I figure I would try to do it that way and see if this works since I am not sure how good the current support for LTO is. Will clang generally work if an external assembler is used?
On Wed, Oct 17, 2018 at 9:05 PM <valdis.kletni...@vt.edu> wrote: > On Wed, 17 Oct 2018 20:02:46 +0800, Carter Cheng said: > > > The problem is I have to do something special with the clang options. I > > have to add an interprocedural link time optimization pass spitting out > > bitcode files and tying them together using llvm-link. > > As I said back on Friday, this is work that's already been done: > > > There's no LTO support in the stock 4.19 tree, but Andi Kleen did a > patchset > > for 4.15, and there's another patchset to enable LTO when using Clang > rather > > than gcc. (I haven't tried either one, don't use on a production > machine, as > > the resulting kernel may crash, eat filesystems, and/or turn your dog > green...) > > http://lmgtfy.com/?q=andi+kleen+linux+4.15+lto > > What you're probably going to run into is that adding the options > isn't the hard part of the project. The hard part will be fixing all > the places where LTO exposes issues in the code, such as this > (already-fixed) problem: > > https://www.mail-archive.com/linux-kernel@vger.kernel.org/msg1620485.html > > >
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