[Bug 196031] [patch] unbreak www/webkit-gtk3 build on FreeBSD 8

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=196031

--- Comment #3 from Don Lewis <truckman at FreeBSD.org> ---
(In reply to Antoine Brodin from comment #2)
> (In reply to Don Lewis from comment #0)
> > NOTE: When building with gcc from ports on i386, CPUTYPE must be set to
> > a value that specifies an architecture that has 8 byte atomic op support
> > (i686 or higher?).  If CPUTYPE is not set, the build will fail with an
> > undefined reference to __atomic_fetch_add_8.
> 
> I think you have to add this kind of hack (untested, not sure about i586):
> 
> .if ${ARCH} == i386 && ! ${CFLAGS:M-march=*}
> # Needed for __atomic_fetch_add_8
> CFLAGS+=       -march=i586
> .endif

Definitely a bit hackish, but it seems to work.  An online search didn't turn
up any info on what the minimum CPU is for atomic_fetch_add_8, but i586 seems
to be sufficient.  I suspect that it is pretty unlikely for anyone to want to
use webkit-gtk3 on an i386 or i486.

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