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    SubjectRe: [PATCH] ARC: build: Try to guess CROSS_COMPILE with cc-cross-prefix
    Hi Alexey,

    On Mon, Jun 3, 2019 at 3:42 PM Alexey Brodkin
    <Alexey.Brodkin@synopsys.com> 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'


    Oh really?

    masahiro@pug:~$ which arc-linux-gcc
    /home/masahiro/tools/arc/bin/arc-linux-gcc
    masahiro@pug:~$ which dummy-linux-gcc
    masahiro@pug:~$ echo $?
    1


    When 'which' cannot find the given command,
    it does not print anything to stderr.

    Does it work differently on your machine?




    --
    Best Regards
    Masahiro Yamada

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