changing parameters in build

[Carter Cheng]

What I mean is will it nowadays compile the kernel with 4.19 or do you need
to manually hack the inline asm?

On Wed, Oct 17, 2018 at 9:11 PM Carter Cheng <cartercheng at gmail.com> wrote:

> 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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