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SubjectRe: Compiling with old gcc breaks when CONFIG_RETPOLINE is off
Since commit '315bab4e972d kbuild: fix endless syncconfig in case arch 
Makefile sets CROSS_COMPILE',

arch/$(SRCARCH)/Makefile is moved ahead of include/config/%.conf
synchonization in root Makefile.

So all the CONFIG_* option used in arch/$(SRCARCH)/Makefile may have
stale value if they were just updated in .config.

This looks like an issue. I'm not familiar with kbuild. Ccing Yamada for



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?

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