On Wed, Mar 30, 2022 at 6:45 PM Masami Hiramatsu <mhiramat@xxxxxxxxxx> wrote:
>
> Hi Nick,
>
> On Wed, 30 Mar 2022 11:04:50 -0700
> Nick Desaulniers <ndesaulniers@xxxxxxxxxx> 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
