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Qt undefs __AVX__ and others[1] to prevent bundled embree from using
AVX/SSE4.2 code paths and result in linking errors, but this appears
insufficient with gcc14[2].
Until Qt improves this, for simplicity pass -mno-* to bundled embree
as a workaround which lets the compiler disable these instead and
that includes other features which depend on these.
(note that embree is only used on amd64 and aarch64)
Ideal would be to unbundle this and let system embree use the full
feature set, but there is no machinery to easily allow it.
[1] https://github.com/qt/qtquick3d/commit/7980cfd0
[2] https://bugs.gentoo.org/917407
--- a/src/3rdparty/embree/CMakeLists.txt
+++ b/src/3rdparty/embree/CMakeLists.txt
@@ -64,2 +64,5 @@
# Use SSE2 only, ignore AVX/SSE4.2 for now
+if (TEST_architecture_arch STREQUAL x86_64)
+ qt_internal_extend_target(BundledEmbree COMPILE_OPTIONS -mno-avx -mno-sse4.2)
+endif()
qt_internal_extend_target(BundledEmbree DEFINES
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