Re: Updating kernel.org cross compilers?

[Guenter Roeck]

On 04/26/2017 07:14 AM, Andre Przywara wrote:
> Hi!
>
> (Tony: I've seen you redirecting to "Chris" in an older email, but the
> web archive doesn't have his email address)
>
> It seems that many people (even outside the Linux kernel community) use
> the cross compilers provided at kernel.org/pub/tools/crosstool.
> The latest compiler I find there is 4.9.0, which celebrated its third
> birthday at the weekend, also has been superseded by 4.9.4 meanwhile.
>
> So I took Segher's buildall scripts from [1] and threw binutils 2.28 and
> GCC 6.3.0 at them. After removing --enable-sjlj-exceptions from
> build-gcc and adding --disable-multilib (for building x86-64 on a x86-64
> box without 32-bit libs) I was able to build (bare-metal) toolchains for
> all architectures except arc, m68k, tilegx and tilepro.
> Now my understanding is that a baremetal/stage 1 compiler should be
> build with "all-gcc" instead of the implicit "all" make target, and
> "install-gcc" instead of "install". And indeed adding this to build-gcc
> makes all toolchains build now - except arc, which needs an explicit
> "--with-cpu=arc700" on the GCC configure command line.
>
> So after those changes, the sequence:
> $ ./buildall --toolchain
> $ PATH=$PATH:/opt/cross/bin
> $ ./buildall --kernel
> worked reasonably well for me (binutils 2.28, GCC 6.3.0, Linux 4.11-rc8
> on an Intel host with Ubuntu 14.04.5). Just tilegx/pro is still broken
> due to toolchain issues.
Those need libgcc, and to build libgcc you'll have to install the kernel
header files. Same is true for cris (and possibly others).

Also, crisv32 builds as well.

> So I wonder what the process is to get those compilers updated?
If you find out let me know.

Guenter

> And what is a good build setup, so that the binaries run on as many
> systems as possible?
>
> Also the web page (https://www.kernel.org/pub/tools/crosstool) seems to
> only link outdated builds (4.6.3, mostly), is that on purpose?
>
> Cheers,
> Andre.
>
> [1] http://git.infradead.org/users/segher/buildall.git/