Unit Tests failing when built with clang 12

[Luke Benes]

Sounds like there is a headless or distro dependent aspect of this bug too. I can reproduce this on both my i686 openSUSE Tumbleweed (32-bit) laptop and on my x86-64 openSUSE Tumbleweed desktop. This issue has not been fixed in clang 13 as today's build 402f2cae7dcab also fails. I also was able to reproduce the failures with this autogen.input: 

--enable-optimized
--disable-debug
--disable-dbgutil
CC=clang
CXX=clang++

What distro is this working on? I can try that in a VM.

-Luke