linux-kernel - Re: [PATCH] kbuild: fix duplicated flags in DEBUG

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Date:   Wed, 03 Feb 2021 11:31:07 +0100
From:   Mark Wielaard <mark@...mp.org>
To:     Masahiro Yamada <masahiroy@...nel.org>,
        linux-kbuild@...r.kernel.org
Cc:     Sedat Dilek <sedat.dilek@...il.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Andi Kleen <andi@...stfloor.org>,
        Ian Rogers <irogers@...gle.com>,
        Michal Marek <michal.lkml@...kovi.net>,
        Nathan Chancellor <natechancellor@...il.com>,
        clang-built-linux@...glegroups.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] kbuild: fix duplicated flags in DEBUG_CFLAGS

Hi Masahiro,

On Wed, 2021-02-03 at 16:52 +0900, Masahiro Yamada wrote:
> With commit 121c5d08d53c ("kbuild: Only add -fno-var-tracking-
> assignments
> for old GCC versions") applied, DEBUG_CFLAGS is now reset only when
> CONFIG_CC_IS_GCC=y.
> 
> Fix it to reset DEBUG_CFLAGS also when using Clang.
> 
> [...] 
> +DEBUG_CFLAGS	:=
> +
>  # Workaround for GCC versions < 5.0
>  # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61801
>  ifdef CONFIG_CC_IS_GCC
> -DEBUG_CFLAGS	:= $(call cc-ifversion, -lt, 0500, $(call cc-option, -fno-var-tracking-assignments))
> +DEBUG_CFLAGS	+= $(call cc-ifversion, -lt, 0500, $(call cc-option, -fno-var-tracking-assignments))
>  endif

Yes, this makes sense given that the original code, before commit
121c5d08d53c did always set DEBUG_CFLAGS without checking for
CONFIG_CC_IS_GCC. So it behaved like the above code does.

Reviewed-by: Mark Wielaard <mark@...mp.org>

Thanks,

Mark