linux-kernel - Re: [PATCH v2 15/21] gcov: remove CONFIG_GCOV_FORMAT

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Date:   Tue, 27 Mar 2018 11:12:06 +0200
From:   Peter Oberparleiter <oberpar@...ux.vnet.ibm.com>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>,
        linux-kbuild@...r.kernel.org
Cc:     Sam Ravnborg <sam@...nborg.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Arnd Bergmann <arnd@...db.de>,
        Ulf Magnusson <ulfalizer@...il.com>,
        Kees Cook <keescook@...omium.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        "Luis R . Rodriguez" <mcgrof@...nel.org>,
        Nicolas Pitre <nico@...aro.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 15/21] gcov: remove CONFIG_GCOV_FORMAT_AUTODETECT

On 27.03.2018 07:29, Masahiro Yamada wrote:
> CONFIG_GCOV_FORMAT_AUTODETECT compiles either gcc_3_4.c or gcc_4_7.c
> according to your GCC version.
> 
> We can achieve the equivalent behavior by setting reasonable dependency
> with the knowledge of the compiler version.
> 
> If GCC older than 4.7 is used, GCOV_FORMAT_3_4 is the default, but users
> are still allowed to select GCOV_FORMAT_4_7 in case the newer format is
> back-ported.
> 
> On the other hand, If GCC 4.7 or newer is used, there is no reason to
> use GCOV_FORMAT_3_4, so it should be hidden.
> 
> If you down-grade your compiler GCC 4.7 or older, oldconfig/syncconfig
> will display a prompt for the choice because GCOV_FORMAT_3_4 becomes
> visible as a new symbol.

Looks sane to me.

Acked-by: Peter Oberparleiter <oberpar@...ux.vnet.ibm.com>

-- 
Peter Oberparleiter
Linux on Z Development - IBM Germany