Date: Mon, 08 Oct 2012 12:25:04 +1030 From: Shane Ambler <FreeBSD@ShaneWare.Biz> To: Tijl Coosemans <tijl@coosemans.org> Cc: gerald@freebsd.org, FreeBSD-ports <freebsd-ports@freebsd.org> Subject: Re: Possible regression in i386 build with gcc 4.6 Message-ID: <50723278.7030009@ShaneWare.Biz> In-Reply-To: <5071FDC4.4060603@coosemans.org> References: <506B3E9A.1000905@ShaneWare.Biz> <5071FDC4.4060603@coosemans.org>
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On 08/10/2012 08:40, Tijl Coosemans wrote:
>> inline long long
>> atomic_exchange_and_add (volatile long long *at, long long x)
>> {
>> #ifdef USE_GCC_ATOMICS
>> return __sync_fetch_and_add (at, x);
>> #elif USE_TBB
>> atomic<long long> *a = (atomic<long long> *)at;
>
> This cast is dangerous. It looks like atomic<long long> has 8 byte
> alignment, but long long on i386 only has 4 byte alignment.
>
Could that be the cause of the seg fault?
gcc42 just happens to generate it into a place that equals 8 byte align
where gcc46 doesn't?
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