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Date:   Sun, 25 Sep 2022 17:21:42 +0200
From:   Willy Tarreau <w@1wt.eu>
To:     Mikhail Gavrilov <mikhail.v.gavrilov@gmail.com>
Cc:     ast@kernel.org, yhs@fb.com, sean.wang@mediatek.com,
        Linux List Kernel Mailing <linux-kernel@vger.kernel.org>
Subject: Re: Unable bisect issue because kernel not building from old commits
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On Sun, Sep 25, 2022 at 07:02:39PM +0500, Mikhail Gavrilov wrote:
> >
> > Note that this looks more related to binutils here. Regardless, there
> > are pre-built toolchains including compiler+binutils for various gcc
> > versions from 4.9 and up here, for all supported architectures:
> >
> >    https://mirrors.edge.kernel.org/pub/tools/crosstool/
> >
> > These ones are sufficient to build a kernel and are likely easier to
> > deal with than trying to port a patch over a bisect session. For example
> > you could have luck with 7.5 which has been supported for a very long
> > time and still is supported.
> 
> I don't quite understand how to switch to the downloaded binutils
> without breaking the distribution.
> I am building the kernel with the following command:
> $ make clean && make -j32 bzImage && make -j32 modules

Just add:

   CROSS_COMPILE=/path/to/toolchain/bin/prefix-

to your make command line and it will be fine.

The makefile will append {gcc,ld,...} to this CROSS_COMPILE prefix to
construct the full pathname to the binaries.

Willy