linux-kernel - Re: [PATCH v3 3/5] kbuild: add read-file macro

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Message-Id: <20221207162208.2200189-1-alexandr.lobakin@intel.com>
Date:   Wed,  7 Dec 2022 17:22:08 +0100
From:   Alexander Lobakin <alexandr.lobakin@...el.com>
To:     Masahiro Yamada <masahiroy@...nel.org>
Cc:     Alexander Lobakin <alexandr.lobakin@...el.com>,
        linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
        "Nicolas Schier" <nicolas@...sle.eu>,
        Nathan Chancellor <nathan@...nel.org>,
        "Nick Desaulniers" <ndesaulniers@...gle.com>
Subject: Re: [PATCH v3 3/5] kbuild: add read-file macro

From: Alexander Lobakin <alexandr.lobakin@...el.com>
Date: Wed, 7 Dec 2022 16:40:44 +0100

> From: Masahiro Yamada <masahiroy@...nel.org>
> Date: Sun, 27 Nov 2022 07:56:22 +0900
> 
> > Since GNU Make 4.2, $(file ...) supports the read operater '<', which
> > is useful to read a file without forking any process. No warning is
> > shown even if the input file is missing.

[...]

> Great stuff. Used it in my upcoming series to simplify things, works
> as expected.
> 
> sed-syms = $(subst $(space),\|,$(foreach file,$(sym-files-y),$(call read-file,$(file))))
> 
> The only thing that came to my mind while I was implementing the
> oneliner above: maybe add ability to read multiple files? For now,
> I used a foreach, could it be somehow incorporated into read-file
> already?

Oh, nevermind. This one also works:

sed-syms = $(subst $(space),\|,$(call read-file,$(sym-files-y)))

So I believe read-file works for an arbitrary number of files.

> 
> Besides that:
> 
> Reviewed-and-tested-by: Alexander Lobakin <alexandr.lobakin@...el.com>

[...]

> > -- 
> > 2.34.1
> 
> Thanks,
> Olek

Thanks!
Olek