changing parameters in build

[Carter Cheng]

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.kletnieks at 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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