From: Peter Maydell <peter.maydell@linaro.org>
To: Sean Bruno <sbruno@freebsd.org>
Cc: "Paolo Bonzini" <pbonzini@redhat.com>,
"Alex Bennée" <alex.bennee@linaro.org>,
"QEMU Developers" <qemu-devel@nongnu.org>
Subject: Re: [Qemu-devel] [FreeBSD] Host build i386 failing to build aarch64 targets
Date: Sun, 20 Mar 2016 20:03:26 +0000 [thread overview]
Message-ID: <CAFEAcA92YQMiDHK9bKV0Q5BMpcd8MtND3EH+MS5EVGVqeSmaSQ@mail.gmail.com> (raw)
In-Reply-To: <56EEF805.8040008@freebsd.org>
On 20 March 2016 at 19:20, Sean Bruno <sbruno@freebsd.org> wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA512
>
> aarch64 targets are now failing to build on i386 hosts due to missing
> __atomic_load_8() calls since this commit:
>
> https://github.com/qemu/qemu/commit/a0aa44b488b3601415d55041e4619aef5f3a4ba8#diff-c143d686899ae51d7b927d9c682e12fd
>
> I'm unsure if Linux is disabling aarch64 targets for i386 hosts or if
> this commit works "just fine" on Linux hosts right now, as it doesn't
> work with clang or gcc.
I think it just works on most Linux 32-bit architectures because
the compiler support can inline a suitable atomic op (there
is one case where it doesn't, which I think is PPC32).
In any case, we mustn't use atomics on types larger
than the host pointer type, because it's not portable enough.
Paolo or Alex, can you have a look at this?
thanks
-- PMM
next prev parent reply other threads:[~2016-03-20 20:03 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-20 19:20 [Qemu-devel] [FreeBSD] Host build i386 failing to build aarch64 targets Sean Bruno
2016-03-20 20:03 ` Peter Maydell [this message]
2016-03-21 9:11 ` Alex Bennée
2016-03-21 14:52 ` Sean Bruno
2016-03-21 15:36 ` Alex Bennée
2016-03-21 15:56 ` Paolo Bonzini
2016-03-22 16:10 ` Sean Bruno
2016-03-22 16:22 ` Alex Bennée
2016-03-28 17:00 ` Sean Bruno
2016-03-31 16:57 ` Sean Bruno
2016-03-21 9:06 ` Paolo Bonzini
2016-03-21 9:35 ` Peter Maydell
2016-03-21 11:23 ` Paolo Bonzini
2016-03-21 11:49 ` Alex Bennée
2016-04-06 16:11 ` Sean Bruno
2016-04-06 18:51 ` Alex Bennée
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