2017-05-19 20:42 GMT+09:00 Masahiro Yamada <yamada.masahiro@xxxxxxxxxxxxx>:
> This allows to detect -s (--silent) option without checking GNU Make
> version.
>
> As commit e36aaea28972 ("kbuild: Fix silent builds with make-4")
> pointed out, GNU Make 4.x changed the way/order it presents the
> command line options into MAKEFLAGS.
>
> In Make 3.8x, 's' is always be the first in a group of short options.
> The group may be prefixed with '-' in some cases.
>
> In Make 4.x, 's' is always the last in a group of short options.
>
> As commit e6ac89fabd03 ("kbuild: Correctly deal with make options
> which contain an 's'") addressed, we also need to deal with long
> options that contain 's', like --warn-undefined-variables.
>
> Test cases:
>
> [1] command line input: make --silent
> -> MAKEFLAGS for Make 3.8x: s
> -> MAKEFLAGS for Make 4.x : s
>
> [2] command line input: make -srR
> -> MAKEFLAGS for Make 3.8x: sRr
> -> MAKEFLAGS for Make 4.x : rRs
>
> [3] command line input: make -s -rR --warn-undefined-variables
> -> MAKEFLAGS for Make 3.8x: --warn-undefined-variables -sRr
> -> MAKEFLAGS for Make 4.x : rRs --warn-undefined-variables
>
> The idea to cater to all the cases more easily is to filter out long
> options (--%), then search 's' with $(findstring ...). This way will
> be more future-proof even if Make 5.x decides to put 's' in the middle
> of the group.
>
> Signed-off-by: Masahiro Yamada <yamada.masahiro@xxxxxxxxxxxxx>
Applied to linux-kbuild/kbuild.
--
Best Regards
Masahiro Yamada
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