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SubjectRe: Compiling with old gcc breaks when CONFIG_RETPOLINE is off
On Wed, Dec 5, 2018 at 10:31 AM Zhenzhong Duan
<zhenzhong.duan@oracle.com> wrote:
>
> Hi Meelis,
>
> Could you try below change? It force syncconfig for any 'make *config"
>
> so that autoconf.h and auto.conf are always updated.


NACK.

syncconfig should happen only when you are about to build something.

This patch let "make *config" touch include/config/* around
unnecessarily.




> 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?
> >



--
Best Regards
Masahiro Yamada

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