linux-kernel - Re: [PATCH v2 05/13] kbuild: detect objtool update without using .SECONDEXPANSION

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Message-ID: <20210904190408.gslbmm44a5rhknny@treble>
Date:   Sat, 4 Sep 2021 12:04:08 -0700
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Masahiro Yamada <masahiroy@...nel.org>
Cc:     linux-kbuild@...r.kernel.org,
        Michal Marek <michal.lkml@...kovi.net>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 05/13] kbuild: detect objtool update without using
 .SECONDEXPANSION

On Tue, Aug 31, 2021 at 04:39:56PM +0900, Masahiro Yamada wrote:
> Redo commit 8852c5524029 ("kbuild: Fix objtool dependency for
> 'OBJECT_FILES_NON_STANDARD_<obj> := n'") to add the objtool
> dependency in a cleaner way.
> 
> Using .SECONDEXPANSION ends up with unreadable code due to escaped
> dollars. Also, it is not efficient because the second half of
> Makefile.build is parsed twice every time.
> 
> Append the objtool dependency to the *.cmd files at the build time.
> 
> This is what fixdep and gen_ksymdeps.sh already do. So, following the
> same pattern seems a natural solution.
> 
> This allows us to drop $$(objtool_deps) entirely.
> 
> Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>

Acked-by: Josh Poimboeuf <jpoimboe@...hat.com>

-- 
Josh