linux-kernel - Re: [PATCH] Raise the minimum required gcc version to 4.6

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Date:   Tue, 21 Aug 2018 15:55:27 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     Joe Perches <joe@...ches.com>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Dave Hansen <dave.hansen@...el.com>,
        Mike Galbraith <efault@....de>,
        Guenter Roeck <linux@...ck-us.net>,
        Rik van Riel <riel@...riel.com>,
        Kees Cook <keescook@...omium.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Jonathan Corbet <corbet@....net>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>
Subject: Re: [PATCH] Raise the minimum required gcc version to 4.6

Hi.



2018-08-21 5:15 GMT+09:00 Joe Perches <joe@...ches.com>:
> Various architectures fail to build properly with older versions
> of the gcc compiler.
>
> An example from Guenter Roeck via this thread:
> https://lore.kernel.org/lkml/20180814170904.GA12768@roeck-us.net/
>
> ----------------------
> In file included from ./include/linux/mm.h:17:0,
>                  from ./include/linux/pid_namespace.h:7,
>                  from ./include/linux/ptrace.h:10,
>                  from arch/openrisc/kernel/asm-offsets.c:32:
> ./include/linux/mm_types.h:497:16: error: flexible array member in otherwise empty struct
>
> This is just an example with gcc 4.5.1 for or32. I have seen the problem
> with gcc 4.4 (for unicore32) as well.
> ----------------------
>
> So update the minimum required version of gcc to 4.6.
>
> Miscellanea:
>
> o Update Documentation/process/changes.rst
> o Remove and consolidate version test blocks in compiler-gcc.h
>   for versions lower than 4.6
>
> Signed-off-by: Joe Perches <joe@...ches.com>
> Reviewed-by: Kees Cook <keescook@...omium.org>
> Reviewed-by: Nick Desaulniers <ndesaulniers@...gle.com>
> ---


This broke Clang build.
I sent a patch.

https://lore.kernel.org/patchwork/patch/976025/

-- 
Best Regards
Masahiro Yamada