linux-kernel - Compiling with old gcc breaks when CONFIG

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Date:   Tue, 4 Dec 2018 11:58:00 +0200
From:   Meelis Roos <mroos@...ux.ee>
To:     Zhenzhong Duan <zhenzhong.duan@...cle.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        David Woodhouse <dwmw@...zon.co.uk>
Cc:     LKML <linux-kernel@...r.kernel.org>
Subject: Compiling with old gcc breaks when CONFIG_RETPOLINE is off

Just tried 4.20-rc5 on an old K6-2 PC with gcc 5.3.1, got an error about non-retpoline compiler,
turned CONFIG_RETPOLINE off and retried.

To my surprise, compilation still breaks with
arch/x86/Makefile:224: *** You are building kernel with non-retpoline compiler, please update your compiler..  Stop.

As I read the Makefile, it should error only when CONFIG_RETPOLINE is enabled, but it still breaks.

$ grep -r CONFIG_RETPOLINE .config
# CONFIG_RETPOLINE is not set

$ grep -r CONFIG_RETPOLINE include/
include/generated/autoconf.h:#define CONFIG_RETPOLINE 1
include/config/auto.conf:CONFIG_RETPOLINE=y

So the headers have not been updated yet, maybe?

-- 
Meelis Roos <mroos@...ux.ee>