Bug#1060849: mesa: FTBFS on armel: static assertion failed: "vn_ring_shared requires lock-free 32-bit atomic_uint"

[Simon McVittie <smcv@debian.org>]

Source: mesa
Version: 23.3.3-1
Severity: serious
Tags: ftbfs
Justification: fails to build from source (but built successfully in the past)
X-Debbugs-Cc: debian-arm@lists.debian.org
User: debian-arm@lists.debian.org
Usertags: armel
Control: block 1060779 by -1

The armel baseline does not have lock-free atomic operation opcodes. The
result is a build failure:

https://buildd.debian.org/status/fetch.php?pkg=mesa&arch=armel&ver=23.3.3-1&stamp=1705055313&raw=0
> In file included from ../src/util/u_math.h:43,
>                  from ../src/virtio/vulkan/vn_common.h:35,
>                  from ../src/virtio/vulkan/vn_buffer.h:14,
>                  from ../src/virtio/vulkan/vn_buffer.c:11:
> ../src/virtio/vulkan/vn_ring.h:40:1: error: static assertion failed: "vn_ring_shared requires lock-free 32-bit atomic_uint"
>    40 | static_assert(ATOMIC_INT_LOCK_FREE == 2 && sizeof(atomic_uint) == 4,

Could this perhaps be solved by disabling the virtio driver on armel?

Thanks,
    smcv