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References: <56EEF805.8040008@freebsd.org> <5705352D.7070603@freebsd.org>
From: Alex =?utf-8?Q?Benn=C3=A9e?= <alex.bennee@linaro.org>
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Date: Wed, 06 Apr 2016 19:51:01 +0100
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Subject: Re: [Qemu-devel] [FreeBSD] Host build i386 failing to build aarch64
	targets
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To: Sean Bruno <sbruno@freebsd.org>
Cc: qemu-devel@nongnu.org


Sean Bruno <sbruno@freebsd.org> writes:

> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA512
>
>
>
> On 03/20/16 12:20, Sean Bruno wrote:
>> 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/a0aa44b488b3601415d55041e4619aef5f
> 3a4ba8#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.
>>
>> More or less, the code in question ends up looking like this bit
>> of test code:
>>
>> #include <stdio.h> #include <sys/types.h> #include
>> <machine/atomic.h>
>>
>> #define atomic_read(ptr)                          \ ({
>> \ typeof(*ptr) _val;                            \
>> __atomic_load(ptr, &_val, __ATOMIC_RELAXED); \ _val;
>> \ })
>>
>> int main () { int foo; int64_t foo64;
>>
>> atomic_read(&foo); atomic_read(&foo64);
>>
>> return(0); }
>>
>>
>> This test code will manifest the same issue as the aarch64 target
>> building on FreeBSD i386 with the error:
>>
>> undefined reference to `__atomic_load_8'
>>
>>
>
>
> This seems to be fixed with the latest commits.  Thanks!

Sorry I thought I'd CC'd you. The patch needed re-spinning to get picked
up by Peter. Glad it is working for you now ;-)

>
> sean
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--
Alex Bennée