linux-kernel - Re: [PATCH v2] Kbuild: tiny correction on `make help`

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Date:   Wed, 14 Jun 2017 10:15:14 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     Cao jin <caoj.fnst@...fujitsu.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Michal Marek <mmarek@...e.com>
Subject: Re: [PATCH v2] Kbuild: tiny correction on `make help`

2017-06-13 18:52 GMT+09:00 Cao jin <caoj.fnst@...fujitsu.com>:
> Yamada-san,
>
>   I have a question on the current top level Makefile. There are
> following lines, I have trouble to understand "firstword x$(MAKEFLAGS)"
> in 2nd line, why there is a 'x' there?
>
>
>   ifneq ($(filter 4.%,$(MAKE_VERSION)),)  # make-4
>   ifneq ($(filter %s ,$(firstword x$(MAKEFLAGS))),)


I do not understand the 'x' either.

Michal suggested the code according to the following:
https://patchwork.kernel.org/patch/3291301/
(I hope Michal can help you.)


My first guess was, it was added just in case $(MAKEFLAGS) is empty.
Actually $(firstword ) seems to work with empty argument, though.



-- 
Best Regards
Masahiro Yamada