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

[Sean Bruno <sbruno@freebsd.org>]

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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!

sean
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