linux-kernel - Re: [PATCH 3/10] compiler-gcc.h: Add gcc-recommended GCC

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Date:	Sun, 30 Sep 2012 17:22:13 -0700
From:	Josh Triplett <josh@...htriplett.org>
To:	Daniel Santos <daniel.santos@...ox.com>
Cc:	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>,
	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>,
	Borislav Petkov <bp@...en8.de>
Subject: Re: [PATCH 3/10] compiler-gcc.h: Add gcc-recommended GCC_VERSION
 macro

On Sun, Sep 30, 2012 at 06:11:01PM -0500, Daniel Santos wrote:
> So in light of feedback I've been getting on this patch set, it leaves
> me with
> this question.
> > +#define GCC_VERSION (__GNUC__ * 10000 \
> > +		   + __GNUC_MINOR__ * 100 \
> > +		   + __GNUC_PATCHLEVEL__)
> This macro presumes you are using gcc 3.0 or later, which introduced the
> __GNUC_PATCHLEVEL__ predefined macro.  Should you be using a version of gcc
> prior to 3.0 (where the macro is undefined), you would get an error that
> __GNUC_PATCHLEVEL__ is undefined prior to getting the error trying to
> include
> "linux/compiler-gcc2.h".  So it presumes the compiler is 3.0+, when another
> part of the code may allow it from a future change.  Should it be
> modified to
> do account for this or would that be overkill?

Overkill, since Linux requires GCC 3.2 or newer.  From compiler-gcc3.h:

#if __GNUC_MINOR__ < 2
# error Sorry, your compiler is too old - please upgrade it.
#endif

- Josh Triplett
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