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Date: Wed, 22 Aug 2018 02:13:51 +0900 From: Masahiro Yamada <yamada.masahiro@...ionext.com> To: Joe Perches <joe@...ches.com> Cc: Linus Torvalds <torvalds@...ux-foundation.org>, Kees Cook <keescook@...omium.org>, Nick Desaulniers <ndesaulniers@...gle.com>, Jonathan Corbet <corbet@....net>, Arnd Bergmann <arnd@...db.de>, David Woodhouse <dwmw@...zon.co.uk>, Linux Kernel Mailing List <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> Subject: Re: [PATCH] compiler-gcc: get back Clang build Hi Joe, 2018-08-21 19:39 GMT+09:00 Joe Perches <joe@...ches.com>: > On Tue, 2018-08-21 at 15:48 +0900, Masahiro Yamada wrote: >> Commit cafa0010cd51 ("Raise the minimum required gcc version to 4.6") >> missed the fact that <linux/compiler-gcc.h> is included by Clang >> as well as by GCC. >> >> Clang actually defines __GNUC__, __GNUC_MINOR__, __GNUC_PATCHLEVEL__ >> and it looks like GCC 4.2.1. >> >> $ scripts/gcc-version.sh -p clang >> 040201 > > Perhaps this would work, but I can't test it as > my clang version doesn't otherwise build a defconfig > and errors out with > > $ make CC=clang > arch/x86/Makefile:179: *** Compiler lacks asm-goto support.. Stop. > > --- > include/linux/compiler-gcc.h | 17 +++++++++++++++++ > 1 file changed, 17 insertions(+) > > diff --git a/include/linux/compiler-gcc.h b/include/linux/compiler-gcc.h > index 3e70b7d4e9ed..3a06ad823fa4 100644 > --- a/include/linux/compiler-gcc.h > +++ b/include/linux/compiler-gcc.h > @@ -3,6 +3,23 @@ > #error "Please don't include <linux/compiler-gcc.h> directly, include <linux/compiler.h> instead." > #endif > > +/* > + * Override clang compiler version #defines > + * > + * compiler_types.h always #includes compiler-gcc.h before compiler-clang,h > + * but clang sets these __GNUC version #defines to 4.2.1. > + * This breaks the gcc minimum version of 4.6.0, so override the clang > + * definitions to 4.6.0 > + */ > +#ifdef __clang__ > + #undef __GNUC__ > + #undef __GNUC_MINOR__ > + #undef __GNUC_PATCHLEVEL__ > + #define __GNUC__ 4 > + #define __GNUC_MINOR__ 6 > + #define __GNUC_PATCHLEVEL__ 0 > +#endif > + > This patch does not work. It only addresses the "# error Sorry, your compiler is too old - please upgrade it." part. Attributes unsupported by Clang must be ifdef'ed out. Otherwise, you will see lots of unknown attribute warnings. -- Best Regards Masahiro Yamada
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