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List:       linux-kbuild
Subject:    Re: [PATCH v5 0/3] bootconfig: Support embedding a bootconfig in kernel for non initrd boot
From:       Nick Desaulniers <ndesaulniers () google ! com>
Date:       2022-03-31 17:31:02
Message-ID: CAKwvOdmbMPBOGvcZNURK6qMx8gm7dGFiWmtX_yXheEqQ8CNLsA () mail ! gmail ! com
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On Wed, Mar 30, 2022 at 6:45 PM Masami Hiramatsu <mhiramat@kernel.org> wrote:
>
> Hi Nick,
>
> On Wed, 30 Mar 2022 11:04:50 -0700
> Nick Desaulniers <ndesaulniers@google.com> wrote:
>
> >
> > Any chance we can use
> >
> > CFLAGS_REMOVE_<file>.o := $(CC_FLAGS_LTO)
> >
> > a la
> > commit d2dcd3e37475 ("x86, cpu: disable LTO for cpu.c")
>
> Hm, this looks good to me. Let me confirm that works.
> (Does this mean the bootconfig.o will be compiled to elf binary?)

I know we went with Masahiro's suggestion, which is clever and better,
but to answer this question; yes, under LTO, the linker can link
together inputs that are a mix of ELF object files (basically, no LTO
optimizations) with LLVM IR (w/ LTO optimizations between such files).
-- 
Thanks,
~Nick Desaulniers
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