[haiku-development] Re: Segmentation fault building jam on FreeBSD 9.0
- From: John Scipione <jscipione@xxxxxxxxx>
- To: haiku-development@xxxxxxxxxxxxx
- Date: Mon, 13 Aug 2012 15:17:02 -0400
On Mon, Aug 13, 2012 at 1:54 PM, Joseph Prostko <joe.prostko@xxxxxxxxx> wrote:
> On Mon, Aug 13, 2012 at 1:16 PM, Joseph Prostko <joe.prostko@xxxxxxxxx> wrote:
>
>> I suspect the problem only occurs with this older GCC4
>> version found on FreeBSD, and the problem may well go away in the
>> future.
>
> I did some digging, and there seems to be a regression with strict
> aliasing in GCC 4.2, which was later fixed in GCC 4.3. FreeBSD is
> still using GCC 4.2.1 out of the box, as that was the last GPLv2
> version of GCC available. In other words, this bug will persist on
> FreeBSD, and won't be going away anytime soon unless we suggest that
> people install a newer GCC which is available via something like
> "pkg_add -r gcc47". I think just not using strict aliasing is the
> sane solution, however.
Building jam is not a problem on OS X which also uses GCC 4.2.1. I
suppose the Apple forked gcc might have backported this particular
strict aliasing fix. Is this problem new to FreeBSD 9.0 or was it also
a problem on 8.x?
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