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 <[email protected]> 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 <[email protected]> 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/[email protected]/msg1620485.html >> >> >>
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