linux-kernel - Re: [PATCH] ARC: build: Try to guess CROSS

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Message-ID: <CAK7LNAQ-NBUuB6duaQP138Jx7y0UpgqaD=wYtRC2G_c5_H=EJg@mail.gmail.com>
Date:   Wed, 12 Jun 2019 20:17:37 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     Alexey Brodkin <Alexey.Brodkin@...opsys.com>,
        Vineet Gupta <Vineet.Gupta1@...opsys.com>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-snps-arc@...ts.infradead.org" 
        <linux-snps-arc@...ts.infradead.org>
Subject: Re: [PATCH] ARC: build: Try to guess CROSS_COMPILE with cc-cross-prefix

Hi.

On Tue, Jun 4, 2019 at 2:49 AM Alexey Brodkin
<Alexey.Brodkin@...opsys.com> wrote:
>
> Hi Vineet,
>
> > -----Original Message-----
> > From: Vineet Gupta <vgupta@...opsys.com>
> > Sent: Monday, June 3, 2019 7:25 PM
> > To: Alexey Brodkin <abrodkin@...opsys.com>; linux-snps-arc@...ts.infradead.org
> > Cc: linux-kernel@...r.kernel.org; Masahiro Yamada <yamada.masahiro@...ionext.com>
> > Subject: Re: [PATCH] ARC: build: Try to guess CROSS_COMPILE with cc-cross-prefix
> >
> > On 6/2/19 11:31 PM, Alexey Brodkin wrote:
> > > For a long time we used to hard-code CROSS_COMPILE prefix
> > > for ARC until it started to cause problems, so we decided to
> > > solely rely on CROSS_COMPILE externally set by a user:
> > > commit 40660f1fcee8 ("ARC: build: Don't set CROSS_COMPILE in arch's Makefile").
> > >
> > > While it works perfectly fine for build-systems where the prefix
> > > gets defined anyways for us human beings it's quite an annoying
> > > requirement especially given most of time the same one prefix
> > > "arc-linux-" is all what we need.
> > >
> > > It looks like finally we're getting the best of both worlds:
> > >  1. W/o cross-toolchain we still may install headers, build .dtb etc
> > >  2. W/ cross-toolchain get the kerne built with only ARCH=arc
> > >
> > > Inspired by [1] & [2].
> > >
> > > [1] http://lists.infradead.org/pipermail/linux-snps-arc/2019-May/005788.html
> > > [2] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=fc2b47b55f17
> > >
> > > A side note: even though "cc-cross-prefix" does its job it pollutes
> > > console with output of "which" for all the prefixes it didn't manage to find
> > > a matching cross-compiler for like that:
> > > | # ARCH=arc make defconfig
> > > | which: no arceb-linux-gcc in (~/.local/bin:~/bin:/usr/bin:/usr/sbin)
> > > | *** Default configuration is based on 'nsim_hs_defconfig'


I just noticed this patch is queued on top of v5.2-rc4.
(2bc42bfba9b247abd)

This 'side note' is no longer needed or reproducible
because -rc4 contains my fix-up (913ab9780fc0212).

I do not know if the ARC maitainer is happy to rebase.

Just for your information.


-- 
Best Regards
Masahiro Yamada