linux-kernel - Re: [PATCH v4 1/3] compiler-gcc.h: add gnu

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Message-ID: <7e375fab-f8ad-705a-dd04-f7e18952bd0c@zytor.com>
Date:   Tue, 12 Jun 2018 14:31:08 -0700
From:   "H. Peter Anvin" <hpa@...or.com>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     sedat.dilek@...il.com, Arnd Bergmann <arnd@...db.de>,
        Andrew Morton <akpm@...ux-foundation.org>, mingo@...hat.com,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-efi@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        x86@...nel.org, virtualization@...ts.linux-foundation.org,
        Alistair Strachan <astrachan@...gle.com>,
        Manoj Gupta <manojgupta@...gle.com>,
        Greg Hackmann <ghackmann@...gle.com>, tstellar@...hat.com,
        Kees Cook <keescook@...gle.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Michal Marek <michal.lkml@...kovi.net>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        geert@...ux-m68k.org, Will Deacon <will.deacon@....com>,
        mawilcox@...rosoft.com, David Rientjes <rientjes@...gle.com>,
        acme@...hat.com, Philippe Ombredanne <pombredanne@...b.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Kate Stewart <kstewart@...uxfoundation.org>,
        boris.ostrovsky@...cle.com, "J. Kiszka" <jan.kiszka@...mens.com>,
        rostedt@...dmis.org, kirill.shutemov@...ux.intel.com,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        akataria@...are.com, brijesh.singh@....com
Subject: Re: [PATCH v4 1/3] compiler-gcc.h: add gnu_inline to all inline
 declarations

On 06/12/18 13:19, Nick Desaulniers wrote:
> 
> Oh, by [0] __GCC_STDC_INLINE__ is indeed actually the correct symbol
> to check for.  Clang does support that, so nothing to fix there.
> 
>> By the way, you should check clang against gcc's predefined macros by doing:
>>
>> gcc [options] -x c -Wp,-dM -E /dev/null | sort
>>
>> Options can change the predefined macros substantially, especially the, -std=, arch and -O options. -x c can be replaced with e.g. -x c++, objective-c, assembler-with-cpp etc.
> 
> Neat, I'll have to bookmark that incantation.  I can s/gcc/clang/ to
> get a similar list (which is how I know it supports
> __GCC_STDC_INLINE__).>

I bet that if you add -fgnu89-inlines then it *does* define
__GNUC_GNU_INLINE__.

> 
> Patch now becomes something like:
> 
> #ifdef __GNUC_GNU_INLINE__
> #define __gnu_inline __attribute__((gnu_inline))
> #else
> #define __gnu_inline
> #endif
> 
> #define inline inline __attribute__((always_inline, unused)) notrace
> __gnu_inline
> ...
> 
> Issues with that approach?
> 

s/__GNUC_GNU_INLINE__/__GNUC_STDC_INLINE__/

	-hpa