linux-kernel - Re: [PATCH linux] objtool: fix pkg-config query in case of cross-compilation

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Message-ID: <4208204.4d101oJ1v5@devpool35>
Date:   Thu, 11 Apr 2019 10:52:39 +0200
From:   Rolf Eike Beer <eb@...ix.com>
To:     Nicolas Dichtel <nicolas.dichtel@...nd.com>
Cc:     tglx@...utronix.de, jpoimboe@...hat.com,
        yamada.masahiro@...ionext.com, peterz@...radead.org,
        linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH linux] objtool: fix pkg-config query in case of cross-compilation

Am Donnerstag, 11. April 2019, 10:39:40 CEST schrieb Nicolas Dichtel:
> In case of cross-compilation, there may be two pkg-config tools, one for
> the host and one for the target. Enable to override the default name.
> 
> Fixes: 056d28d135bc ("objtool: Query pkg-config for libelf location")
> Signed-off-by: Nicolas Dichtel <nicolas.dichtel@...nd.com>

If you do that, you have to fix a lot of other places, too. This starts in 
scripts/kconfig/ and also includes e.g. tools/testing/.

Usually you have pkg-config for host and ${target_platform}-pkg-config for the 
target, and the PKG_CONFIG variable for the target, usually initialized to $
(CROSS_COMPILE)pkg-config. I have sent a bunch of patches to replace the usage 
of plain pkg-config at several places with the cross-aware version, but sadly 
a lot of them have not been picked up. It break cross-building tests basically 
all the time. One example is here: 

https://marc.info/?l=linux-acpi&m=153544231529066&w=2

For me it looks like you are trying to go into the wrong direction.

Greetings,

Eike
-- 
Rolf Eike Beer, emlix GmbH, http://www.emlix.com
Fon +49 551 30664-0, Fax +49 551 30664-11
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