linux-kernel - Re: Build regressions/improvements in v4.9-rc1

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Message-ID: <20161027111118.5c585d51@free-electrons.com>
Date:   Thu, 27 Oct 2016 11:11:18 +0200
From:   Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
To:     Alexey Brodkin <Alexey.Brodkin@...opsys.com>
Cc:     "mpe@...erman.id.au" <mpe@...erman.id.au>,
        "linux-snps-arc@...ts.infradead.org" 
        <linux-snps-arc@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "Vineet.Gupta1@...opsys.com" <Vineet.Gupta1@...opsys.com>,
        "arnd@...db.de" <arnd@...db.de>,
        "geert@...ux-m68k.org" <geert@...ux-m68k.org>,
        "mmarek@...e.cz" <mmarek@...e.cz>
Subject: Re: Build regressions/improvements in v4.9-rc1

Hello,

On Thu, 27 Oct 2016 09:07:55 +0000, Alexey Brodkin wrote:

> > axs101 is using a 770 core, while the toolchain is built for the HS38
> > core. I'm somewhat surprised that a single ARC toolchain cannot produce
> > code for both 770 and HS38, but it seems to be the case.
> > 
> > So you need a separate toolchain for ARC770.  
> 
> Indeed axs101 uses ARC770 core which is ARCv1 AKA ARCompact ISA while
> axs103 sports the same base-board but CPU daughter-card contains ARC HS38 core
> which has ARCv2 ISA (binary incompatible with ARCompact).
> 
> Essentially both gcc and binutils will happily build for both architectures given
> proper options were passed on the command line. But Linux kernel gets linked with
> pre-built libgcc (it is a part of toolchain). And so it all boils down to a requirement
> to have multilibbed uClibc toolchain. Which we don't have.

Interesting. Why is libgcc linked with the kernel on ARC? I don't think
that's the case on other architectures: the kernel is freestanding and
provides everything that it needs without relying on the compiler
runtime.

Best regards,

Thomas
-- 
Thomas Petazzoni, CTO, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com