linux-kernel - Re: [PATCH] cxl: Fix error handling

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Message-ID: <87eg2unnil.fsf@concordia.ellerman.id.au>
Date:   Wed, 02 Nov 2016 22:12:50 +1100
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Jim Davis <jim.epost@...il.com>
Cc:     Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        imunsie@....ibm.com, fbarrat@...ux.vnet.ibm.com,
        kernel-janitors@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] cxl: Fix error handling

Jim Davis <jim.epost@...il.com> writes:

> On Sun, Oct 30, 2016 at 10:37 PM, Michael Ellerman <mpe@...erman.id.au> wrote:
>> More here:
>>
>> https://github.com/linuxppc/linux/wiki/Building-powerpc-kernels
>
> Cool; the little-endian build worked fine, but

Yay, thanks for trying.

> jim@...bstar:~/linux-rc$ make ARCH=powerpc
> CROSS_COMPILE=powerpc64-linux-gnu- vmlinux
> make: powerpc64-linux-gnu-gcc: Command not found
> make: powerpc64-linux-gnu-gcc: Command not found
> scripts/kconfig/conf  --silentoldconfig Kconfig
> make: powerpc64-linux-gnu-gcc: Command not found

Ah sorry.

> This is on Ubuntu 16.04; there's a /usr/bin/powerpc64le-linux-gnu-gcc
> from installing gcc-powerpc64le-linux-gnu, and a
> /usr/bin/powerpc-linux-gnu-gcc from installing gcc-powerpc-linux-gnu,
> but no /usr/bin/powerpc64-linux-gnu-gcc.

It's the powerpc-linux-gnu-gcc one.

That is a 32 and 64-bit compiler, it's 32-bit by default, but the kernel
Makefiles will pass -m64 appropriately.

You can actually build a single compiler that builds 32/64-bit BE, and
64-bit LE, but the distros don't do that for whatever reason.

cheers