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package/qemu: host-qemu does not support AVX512 CPUs

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Building gobject-introspection for an x86 CPU variant with AVX512 fails
when g-ir-scanner runs the freshly built target binaries under
qemu-user:

  qemu: uncaught target signal 4 (Illegal instruction) - core dumped

The Qemu TCG engine implements AVX, AVX2, F16C, FMA3 and VAES since Qemu
7.2, but it does not implement the AVX512 instruction set at all [0].
Therefore no -cpu value passed through
BR2_PACKAGE_HOST_QEMU_USER_MODE_ARGS can make such binaries run, and
user-mode emulation is simply not possible for these CPU variants.

Mark those CPUs as unsupported by host-qemu, the same way it is already
done for x86_steamroller and x86_core_avx2. This relies on the existing
BR2_X86_CPU_HAS_AVX512 symbol, so all AVX512 capable variants are
covered, and it disables gobject-introspection and nodejs, which are the
two packages needing host-qemu in user mode.

[0] https://gitlab.com/qemu-project/qemu/-/issues/2878

Fixes:

  https://autobuild.buildroot.org/results/7ed7f9c36dae1ddb965a0f0021db6cd319927b47/

Signed-off-by: Yegor Yefremov <yegorslists@googlemail.com>
Assisted-by: Claude:claude-opus-5
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
This commit is contained in:
Yegor Yefremov
2026-09-14 11:26:12 +02:00
committed by Thomas Petazzoni
parent 05cbe542f9
commit c2bd6148c6
1 changed files with 4 additions and 0 deletions
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4
package/qemu/Config.in.host
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@@ -23,6 +23,10 @@ config BR2_PACKAGE_HOST_QEMU_ARCH_SUPPORTS
default y if BR2_xtensa
default y if BR2_x86_64
depends on !BR2_x86_steamroller && !BR2_x86_core_avx2
# The Qemu TCG engine does not implement the AVX512
# instruction set, so binaries built for such CPUs cannot be
# emulated.
depends on !BR2_X86_CPU_HAS_AVX512
depends on !BR2_powerpc_620 && !BR2_powerpc_630
config BR2_PACKAGE_HOST_QEMU_SYSTEM_ARCH_SUPPORTS