linux-kernel - Re: [PATCH] include/linux/compiler*.h: make compiler-*.h mutually exclusive

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Date:   Sun, 26 Aug 2018 19:37:28 +0200
From:   Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
To:     Joe Perches <joe@...ches.com>
Cc:     Nick Desaulniers <ndesaulniers@...gle.com>,
        Kees Cook <keescook@...omium.org>, asmadeus@...ewreck.org,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Jonathan Corbet <corbet@....net>,
        Arnd Bergmann <arnd@...db.de>, dwmw@...zon.co.uk,
        LKML <linux-kernel@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Will Deacon <will.deacon@....com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Ingo Molnar <mingo@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        daniel@...earbox.net, "H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH] include/linux/compiler*.h: make compiler-*.h mutually exclusive

Hi all,

On Fri, Aug 24, 2018 at 1:31 AM, Joe Perches <joe@...ches.com> wrote:
> On Thu, 2018-08-23 at 16:12 -0700, Nick Desaulniers wrote:
>> On Thu, Aug 23, 2018 at 2:19 PM Joe Perches <joe@...ches.com> wrote:
>> >
>> > On Thu, 2018-08-23 at 14:03 -0700, Nick Desaulniers wrote:
>> > > Not this case; it's how we get gnu89 semantics for `extern inline` is
>> > > not compiler specific (therefor should not go in a compiler specific
>> > > header).
>> >
>> > It's not possible to know that compilers support what
>> > __attribute__((<foo>)) and at what version that support
>> > exists unless it is specified somewhere.
>>
>> __has_attribute:
>> https://clang.llvm.org/docs/LanguageExtensions.html#has-attribute
>>
>> The release notes of GCC-5 mention __has_attribute.
>> https://gcc.gnu.org/gcc-5/changes.html
>
> So not available in the now minimum supported gcc 4.6?
>

We can workaround that until we have 5 as the minimum. I have tried
and the result is quite nice.

Sending the patch in a few moments -- compile-testing for a while
allmodconfig on both 4.6 and 8.2...

Cheers,
Miguel