linux-kernel - Re: [PATCH v3 03/10] compiler-gcc{3,4}.h: Use GCC

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Date:	Wed, 24 Oct 2012 14:49:00 -0700
From:	Josh Triplett <josh@...htriplett.org>
To:	Borislav Petkov <bp@...en8.de>, danielfsantos@....net,
	LKML <linux-kernel@...r.kernel.org>,
	Andi Kleen <ak@...ux.intel.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Christopher Li <sparse@...isli.org>,
	Daniel Santos <daniel.santos@...ox.com>,
	David Daney <david.daney@...ium.com>,
	David Howells <dhowells@...hat.com>,
	Joe Perches <joe@...ches.com>,
	Konstantin Khlebnikov <khlebnikov@...nvz.org>,
	linux-sparse@...r.kernel.org,
	Michel Lespinasse <walken@...gle.com>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Pavel Pisa <pisa@....felk.cvut.cz>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Steven Rostedt <rostedt@...dmis.org>,
	David Rientjes <rientjes@...gle.com>
Subject: Re: [PATCH v3 03/10] compiler-gcc{3,4}.h: Use GCC_VERSION macro

On Wed, Oct 24, 2012 at 09:05:46PM +0200, Borislav Petkov wrote:
> On Wed, Oct 24, 2012 at 11:33:54AM -0500, danielfsantos@....net wrote:
> > Using GCC_VERSION reduces complexity, is easier to read and is GCC's
> > recommended mechanism for doing version checks. (Just don't ask me why
> > they didn't define it in the first place.)  This also makes it easy to
> > merge compiler-gcc{,3,4}.h should somebody want to.
> > 
> > Signed-off-by: Daniel Santos <daniel.santos@...ox.com>
> > Acked-by: David Rientjes <rientjes@...gle.com>
> > ---
> >  include/linux/compiler-gcc3.h |    8 ++++----
> >  include/linux/compiler-gcc4.h |   14 +++++++-------
> >  2 files changed, 11 insertions(+), 11 deletions(-)
> > 
> > diff --git a/include/linux/compiler-gcc3.h b/include/linux/compiler-gcc3.h
> > index 37d4124..7d89feb 100644
> > --- a/include/linux/compiler-gcc3.h
> > +++ b/include/linux/compiler-gcc3.h
> > @@ -2,22 +2,22 @@
> >  #error "Please don't include <linux/compiler-gcc3.h> directly, include <linux/compiler.h> instead."
> >  #endif
> >  
> > -#if __GNUC_MINOR__ < 2
> > +#if GCC_VERSION < 30200
> >  # error Sorry, your compiler is too old - please upgrade it.
> >  #endif
> >  
> > -#if __GNUC_MINOR__ >= 3
> > +#if GCC_VERSION >= 30300
> >  # define __used			__attribute__((__used__))
> >  #else
> >  # define __used			__attribute__((__unused__))
> >  #endif
> >  
> > -#if __GNUC_MINOR__ >= 4
> > +#if GCC_VERSION >= 30400
> >  #define __must_check		__attribute__((warn_unused_result))
> >  #endif
> >  
> >  #ifdef CONFIG_GCOV_KERNEL
> > -# if __GNUC_MINOR__ < 4
> > +# if GCC_VERSION < 30400
> >  #   error "GCOV profiling support for gcc versions below 3.4 not included"
> >  # endif /* __GNUC_MINOR__ */
> >  #endif /* CONFIG_GCOV_KERNEL */
> > diff --git a/include/linux/compiler-gcc4.h b/include/linux/compiler-gcc4.h
> > index 8914293..9755029 100644
> > --- a/include/linux/compiler-gcc4.h
> > +++ b/include/linux/compiler-gcc4.h
> > @@ -4,7 +4,7 @@
> >  
> >  /* GCC 4.1.[01] miscompiles __weak */
> >  #ifdef __KERNEL__
> > -# if __GNUC_MINOR__ == 1 && __GNUC_PATCHLEVEL__ <= 1
> > +# if GCC_VERSION >= 40100 &&  GCC_VERSION <= 40101
> >  #  error Your version of gcc miscompiles the __weak directive
> >  # endif
> >  #endif
> > @@ -13,11 +13,11 @@
> >  #define __must_check 		__attribute__((warn_unused_result))
> >  #define __compiler_offsetof(a,b) __builtin_offsetof(a,b)
> >  
> > -#if __GNUC_MINOR__ > 0
> > +#if GCC_VERSION >= 40100
> 
> I can't seem to recall so did we explain already why ">= 40100" instead
> of "> 40000"?
> 
> I mean, it is the same, but still...

__GNUC_MINOR__ > 0 means __GNUC_MINOR__ >= 1, so that would allow 4.1 or
newer.  However, GCC_VERSION > 40000 would also allow 4.0.n for n > 0.

- Josh Triplett
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