Re: [PATCH v2 03/13] kbuild: store the objtool command in *.cmd files

Kees Cook
2021-08-31T17:30:29Z

On Tue, Aug 31, 2021 at 04:39:54PM +0900, Masahiro Yamada wrote:
> objtool_dep includes include/config/{ORC_UNWINDER,STACK_VALIDATION}
> so that all the objects are rebuilt when any of CONFIG_ORC_UNWINDER
> and CONFIG_STACK_VALIDATION is toggled.
>
> As you can see in 'objtool_args', there are more CONFIG options
> that affect the objtool command line.
>
> Adding more and more include/config/* is ugly and unmaintainable.
>
> Another issue is that non-standard objects are needlessly rebuilt.
> Objects specified as OBJECT_FILES_NON_STANDARD is not processed by
> objtool, but they are rebuilt anyway when CONFIG_ORC_UNWINDER or
> CONFIG_STACK_VALIDATION is toggled. This is not a big deal, but
> better to fix.
>
> A cleaner and more precise fix is to include the objtool command in
> *.cmd files so any command change is naturally detected by if_change.
>
> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>

Yeah, nice solution for this.

Reviewed-by: Kees Cook <keescook@chromium.org>

--
Kees Cook