OK, so, turns out the avx stuff was a red herring caused by Mesa. I
solved the issue by rebuilding Mesa with this patch:
https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/31321?commit_id=a8eed9cca26b1c4b6526be7d042adec6703a30ae
however while Qt Designer no longer outputs those warnings, it still
segfaults.
Stack trace:
Thread 1 "designer" received signal SIGSEGV, Segmentation fault.
0x00007fffd54e934b in ?? () from /lib/x86_64-linux-gnu/libKF6WidgetsAddons.so.6
(gdb) bt
#0 0x00007fffd54e934b in ??? () at
/lib/x86_64-linux-gnu/libKF6WidgetsAddons.so.6
#1 0x00007fffe8156ad6 in ??? () at
/usr/lib/x86_64-linux-gnu/qt6/plugins/designer/kwidgetsaddons6widgets.so
#2 0x00007ffff7870554 in
qdesigner_internal::WidgetFactory::createCustomWidget(QString const&, QWidget*,
bool*) const () at /lib/x86_64-linux-gnu/libQt6Designer.so.6
#3 0x00007ffff78717cd in
qdesigner_internal::WidgetFactory::createWidget(QString const&, QWidget*) const
() at /lib/x86_64-linux-gnu/libQt6Designer.so.6
#4 0x00007ffff786a456 in
qdesigner_internal::WidgetDataBase::defaultPropertyValues(QString const&) () at
/lib/x86_64-linux-gnu/libQt6Designer.so.6
#5 0x00007ffff786a626 in
qdesigner_internal::WidgetDataBase::grabDefaultPropertyValues() () at
/lib/x86_64-linux-gnu/libQt6Designer.so.6
#6 0x00005555555b5505 in ??? ()
#7 0x000055555557cb6a in ??? ()
#8 0x00007ffff562a3b8 in __libc_start_call_main
(main=main@entry=0x55555557c030, argc=argc@entry=1,
argv=argv@entry=0x7fffffffdeb8)
at ../sysdeps/nptl/libc_start_call_main.h:58
#9 0x00007ffff562a47b in __libc_start_main_impl
(main=0x55555557c030, argc=1, argv=0x7fffffffdeb8, init=<optimized out>,
fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fffffffdea8)
at ../csu/libc-start.c:360
#10 0x000055555557d665 in ??? ()
** Summary changed:
- designer-qt6 crashes with "'-avx512er' is not a recognized feature for this
target (ignoring feature)"
+ designer-qt6 segfaults in libKF6WidgetsAddons.so.6
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https://bugs.launchpad.net/bugs/2082878
Title:
designer-qt6 segfaults in libKF6WidgetsAddons.so.6
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