linux-kernel - Re: [PATCH 1/2] kbuild: rename cmd_$@ to savedcmd

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Message-ID: <Y62f+iQdStrD4SIS@fjasle.eu>
Date:   Thu, 29 Dec 2022 15:11:06 +0100
From:   Nicolas Schier <nicolas@...sle.eu>
To:     Masahiro Yamada <masahiroy@...nel.org>
Cc:     linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>, llvm@...ts.linux.dev
Subject: Re: [PATCH 1/2] kbuild: rename cmd_$@ to savedcmd_$@ in *.cmd files

On Thu, Dec 29, 2022 at 06:15:00PM +0900 Masahiro Yamada wrote:
> The cmd-check macro compares $(cmd_$@) and $(cmd_$1), but a pitfall is
> that you cannot use cmd_<target> as the variable name for the command.
> 
> For example, the following code will not work in the top Makefile
> or ./Kbuild.
> 
>     quiet_cmd_foo = GEN     $@
>           cmd_foo = touch $@
> 
>     targets += foo
>     foo: FORCE
>             $(call if_changed,foo)
> 
> In this case, both $@ and $1 are expanded to 'foo', so $(cmd_check)
> is always empty.
> 
> We do not need to use the same prefix for cmd_$@ and cmd_$1.
> Rename the former to savedcmd_$@.
> 
> Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
> ---
> 
>  scripts/Kbuild.include                      | 8 ++++----
>  scripts/Makefile.modfinal                   | 2 +-
>  scripts/basic/fixdep.c                      | 4 ++--
>  scripts/clang-tools/gen_compile_commands.py | 2 +-
>  4 files changed, 8 insertions(+), 8 deletions(-)
> 

Thanks for fixing this, I wasn't aware of that at all.

Reviewed-by: Nicolas Schier <nicolas@...sle.eu>

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