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Re: [Qemu-devel] [FreeBSD] Host build i386 failing to build aarch64 targ

From: Alex Bennée
Subject: Re: [Qemu-devel] [FreeBSD] Host build i386 failing to build aarch64 targets
Date: Mon, 21 Mar 2016 11:49:02 +0000
User-agent: mu4e 0.9.17; emacs

Paolo Bonzini <address@hidden> writes:

> On 21/03/2016 10:35, Peter Maydell wrote:
>> > x86 can actually do 64-bit atomic loads and stores through the FPU, but
>> > I'm not sure about other 32-bit targets?
>> As I say, ppc32 linux is one that can't -- see commit 8a5956ad6392f1155
>> for last time this came up.
> Yes, I remember that.  Loads and stores are different from RMW
> operations, though.
>> Ideally we should put a compile-time assert in the atomic ops that
>> the data being operated on isn't larger than sizeof(void*) so that
>> this is a compile time error on all 32-bit hosts rather than just
>> a small subset of them.
> Yes, I will do it if Alex doesn't beat me to it.

I'm working on it now.

 - fix build failures on 32bit hosts (Linux/BSD)
 - add compile-time assert for sizeof <= sizeof (void*)

Anything else?

> Paolo

Alex Bennée

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