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Message-ID: <CAK8P3a3-eufj=HM4Mi+KaSLxuoPwtw0P4EfmtYfVcbnR0mVwAw@mail.gmail.com>
Date: Wed, 21 Feb 2018 17:03:25 +0100
From: Arnd Bergmann <arnd@...db.de>
To: Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc: Rich Felker <dalias@...c.org>, Kernel Hardening <kernel-hardening@...ts.openwall.com>,
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Subject: Re: [PATCH 00/23] kconfig: move compiler capability tests to Kconfig
On Wed, Feb 21, 2018 at 1:57 PM, Masahiro Yamada
<yamada.masahiro@...ionext.com> wrote:
> 2018-02-21 19:52 GMT+09:00 Arnd Bergmann <arnd@...db.de>:
>> On Wed, Feb 21, 2018 at 11:20 AM, Masahiro Yamada
>> <yamada.masahiro@...ionext.com> wrote:
>>> 2018-02-21 18:56 GMT+09:00 Arnd Bergmann <arnd@...db.de>:
>>>> On Wed, Feb 21, 2018 at 8:38 AM, Masahiro Yamada
>>>> <yamada.masahiro@...ionext.com> wrote:
>>>>> 2018-02-20 0:18 GMT+09:00 Ulf Magnusson <ulfalizer@...il.com>:
>
> Hmm, I think I can implement those somehow.
> But, I hope we do not have many instances like this...
>
>
> If you know more naive cases, please share your knowledge.
>
One case that comes to mind would be architecture level selection on 32-bit
ARM, which is roughly this (I probably have some details wrong, but you
get the idea):
- older compilers don't support the latest architecture setting (-march=armv8
or -march=armv7ve)
- newer compilers no longer support really old architectures (-march=armv4)
- setting -mthumb requires setting one of -march=armv7-a, armv7ve, armv7-m or
armv8 if the compiler doesn't default to those
- on a compiler that defaults to -marm, setting -march=armv7-m requires
setting -mthumb (IIRC)
- really old compilers only support OABI, but not EABI
- newer compilers no longer support OABI
- mthumb requires EABI
- armv6 and higher are subtly broken with OABI, but only when using
certain inline assembly with 64-bit arguments in register pairs.
I think we just shouldn't try to capture all of the above correctly in Kconfig
conditionals.
Arnd
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