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Date:   Mon, 29 Mar 2021 06:57:37 +0200
From:   Greg KH <greg@kroah.com>
To:     Fawad Lateef <fawadlateef@gmail.com>
Cc:     kernelnewbies <kernelnewbies@nl.linux.org>,
        kernelnewbies <kernelnewbies@kernelnewbies.org>,
        linux-kernel@vger.kernel.org
Subject: Re: Compiling kernel-3.4.xxx with gcc-9.x. Need some help.
Message-ID: <YGFeQUuAaKgeaqCA@kroah.com>
References: <CAGgoGu77PEEAJped5bnw4q8rFeDMebL92YWGDGFfNp_ZAnpJ8Q@mail.gmail.com>
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On Sun, Mar 28, 2021 at 10:20:50PM +0200, Fawad Lateef wrote:
> Hi
> 
> I am using an Olimex A20 SOM with NAND and due to some binary blob for
> NAND driver, I am stuck with the sunxi kernel 3.4.xxx version. (Repo
> here: https://github.com/linux-sunxi/linux-sunxi)

Please work with the vendor that is forcing you to use this obsolete and
insecure kernel version.  You are paying for that support, and they are
the only ones that can support you.

> I am currently using buildroot-2016 and gcc-5.5 for building the
> kernel and every other package needed.
> 
> Now the requirement is to move to the latest version of gcc-9.x, so
> that we can have glibc++ provided by the gcc-9.1 toolchain.
> 
> Main problem for moving to later versions of buildroot is the kernel
> 3.4 which we couldn't to work with gcc-6 a few years ago _but_ now the
> gcc-9.1 requirement is mandatory so now have to look into compiling
> linux-3.4 with gcc-9.1 or above.
> 
> Now I need some help.
> 
> -- Is it realistic to expect 3.4 kernel compiling and boot
> successfully with gcc-9.1?

No.  It took a lot of work and effort just to get the 4.4.y kernel to
work with that gcc version.

Again, please work with the company that you are already paying for
support from, they can do this for you.

good luck!

greg k-h