link time analysis for the kernel.

[Carter Cheng]

Actually I have compiled and installed kernels before. I am wondering
however if LTO still works for compiling kernel images on clang or gcc
since my understanding is the kernel code includes a kernel loader which
loads the ELF format but the image of an OS kernel is loaded either
directly or via a bootloader which my understanding is cannot read ELF(is
this correct?).



On Fri, Oct 12, 2018 at 2:02 AM <o at goosey.org> wrote:

>
>
> 11.10.2018, 17:48, "Carter Cheng" <cartercheng at gmail.com>:
>
> Hi,
>
>
>
> Hello,
>
> I want to ask pardon me and have you ever compiled a linux kernel?
> In my opinion you should first examine gcc ld and make process :)
>
> The elf format executable format and  the process after compiling the c
> code.
> Please read:
>
> http://www.ntu.edu.sg/home/ehchua/programming/cpp/gcc_make.html
>
> keep calm and go step by step and continue to learn c, gcc, ld, make, c
> code compile to machine code.
>
> Ozgur
>
>
>
>
> There are some detaills about the current procedures for linking the
> kernel that I am unfamiliar with. My understanding is that GCC and Clang
> both have the ability to do link time analysis and transforms on code but
> is it possible to write link time passes that will run on the kernel since
> the linking phase is a bit different (i.e. doesnt produce an ELF file)?
>
> Regards,
>
> Carter.
> ,
>
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