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Details

Type: Bug
Resolution: Fixed
Priority: P1: Critical
Fix Version/s: 6.5.8, 6.8.1, 6.9.0 FF
Affects Version/s: 6.8
Component/s: Quick: 3D
Labels:
None

Commits:
b0d6afa7e (dev), a39a7e38f (6.8), ed905db74 (tqtc/lts-6.5)

Description

Using GCC 14.2.0, quick3d build fails to link with bundled embree for x86 targets.

| /usr/src/debug/qtquick3d/6.9.0/src/3rdparty/embree/kernels/common/scene.cpp:205: error: undefined reference to 'embree::BVH8Factory::BVH8Triangle4vMB(embree::Scene*, embree::BVHFactory::BuildVariant, embree::BVHFactory::IntersectVaria
nt)'
| /usr/src/debug/qtquick3d/6.9.0/src/3rdparty/embree/kernels/common/scene.cpp:204: error: undefined reference to 'embree::BVH8Factory::BVH8Triangle4iMB(embree::Scene*, embree::BVHFactory::BuildVariant, embree::BVHFactory::IntersectVaria
nt)'
| /usr/src/debug/qtquick3d/6.9.0/src/3rdparty/embree/kernels/common/scene.cpp:167: error: undefined reference to 'embree::BVH8Factory::BVH8QuantizedTriangle4(embree::Scene*)'

The AVX code paths are not correctly disabled. This is caused by change of behavior in GCC 14 (bug or feature?), where undef'ing _AVX_ is reversed by GCC pragmas from GCC headers.

GCC issue can be reproduced with simple test code

#undef __AVX__

// from gcc/x86_64-poky-linux/14.2.0/include/x86gprintrin.h
#pragma GCC push_options
#pragma GCC target("general-regs-only")
#pragma GCC pop_options

#ifdef __AVX__
#error avx defined again
#endif