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Date: Fri, 11 Sep 2009 16:59:15 -0400 From: Kyle McMartin <kyle@...artin.ca> To: Andrew Morton <akpm@...ux-foundation.org> Cc: Roland McGrath <roland@...hat.com>, torvalds@...ux-foundation.org, jakub@...hat.com, linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org, x86@...nel.org Subject: Re: [PATCH 1/2] UNREACHABLE() macro On Fri, Sep 11, 2009 at 01:45:28PM -0700, Andrew Morton wrote: > On Wed, 9 Sep 2009 19:00:31 -0700 (PDT) > Roland McGrath <roland@...hat.com> wrote: > > > +/* > > + * __builtin_unreachable is available in GCC 4.5+ and > > + * also in Fedora/Red Hat GCC 4.4.1-10+. > > + */ > > +#if (__GNUC_MINOR__ > 4 \ > > + || (__GNUC_MINOR__ == 4 \ > > + && defined __GNUC_RH_RELEASE__ \ > > + && (__GNUC_PATCHLEVEL__ > 1 \ > > + || (__GNUC_PATCHLEVEL__ == 1 \ > > + && __GNUC_RH_RELEASE__ >= 10)))) > > +#define UNREACHABLE() __builtin_unreachable() > > +#endif > > That's a bit of a mouthful. Did you consider a runtime probe with > scripts/Kbuild.include's try-run, cc-option, etc? If the crap for determining if it's a RH gcc is removed, then it becomes really straightforward... Should probably just do that and then apply a patch to Fedora if it's so damned important it can't just wait for the next GCC release. regards, Kyle -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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