linux-kernel - Re: Compiling with old gcc breaks when CONFIG

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Date:   Wed, 5 Dec 2018 09:30:07 +0800
From:   Zhenzhong Duan <zhenzhong.duan@...cle.com>
To:     Meelis Roos <mroos@...ux.ee>, Thomas Gleixner <tglx@...utronix.de>,
        David Woodhouse <dwmw@...zon.co.uk>
Cc:     LKML <linux-kernel@...r.kernel.org>, yamada.masahiro@...ionext.com
Subject: Re: Compiling with old gcc breaks when CONFIG_RETPOLINE is off

Hi Meelis,

Could you try below change? It force syncconfig for  any 'make *config"

so that autoconf.h and auto.conf are always updated.

diff --git a/scripts/kconfig/conf.c b/scripts/kconfig/conf.c
index 98e0c7a..802875b 100644
--- a/scripts/kconfig/conf.c
+++ b/scripts/kconfig/conf.c
@@ -38,7 +38,7 @@ enum input_mode {

  static int indent = 1;
  static int tty_stdio;
-static int sync_kconfig;
+static int sync_kconfig = 1;
  static int conf_cnt;
  static char line[PATH_MAX];
  static struct menu *rootEntry;
@@ -506,11 +506,11 @@ int main(int ac, char **av)
                          * Suppress distracting "configuration written 
to ..."
                          */
                         conf_set_message_callback(NULL);
-                       sync_kconfig = 1;
                         break;
                 case defconfig:
                 case savedefconfig:
                         defconfig_file = optarg;
+                       sync_kconfig = 0;
                         break;
                 case randconfig:
                 {
@@ -537,13 +537,15 @@ int main(int ac, char **av)
                         srand(seed);
                         break;
                 }
+               case listnewconfig:
+                       sync_kconfig = 0;
+                       /* fall through */
                 case oldaskconfig:
                 case oldconfig:
                 case allnoconfig:
                 case allyesconfig:
                 case allmodconfig:
                 case alldefconfig:
-               case listnewconfig:
                 case olddefconfig:
                         break;
                 case '?':

Thanks

Zhenzhong

On 2018/12/4 17:58, Meelis Roos wrote:
> 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?
>