Re: linux-next: build warning after merge of the kbuild tree

[Masahiro Yamada]

On Fri, Aug 20, 2021 at 8:28 AM Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx> wrote:
>
> Hi all,
>
> After merging the kbuild tree, today's linux-next build (x86_64
> allmodconfig) produced this warning:
>
> arch/x86/entry/vdso/Makefile:135: FORCE prerequisite is missing
> arch/x86/entry/vdso/Makefile:135: FORCE prerequisite is missing
> arch/x86/entry/vdso/Makefile:135: FORCE prerequisite is missing
>
> Exposed by commit
>
>   0fc7db58e2a6 ("kbuild: warn if FORCE is missing for if_changed(_dep,_rule) and filechk")
>
> Not sure why we need 3 of these :-(


This is a pattern rule, which generates
vdso64.so, vdso32.so, and vdsox32.so

The warning is produced as a side-effect
of the recipe. That is why 3 warnings.
Otherwise, I do not know how to implement it.


BTW, a fix for x86 Makefile exists in the patchwork.

https://lore.kernel.org/patchwork/patch/1478798/


-- 
Best Regards
Masahiro Yamada