[llvm-dev] compiler ICE on darwin

[Jack Howarth via llvm-dev]

   Does anyone have any insights into why clang ICEs when
compiling layer2/RepCylBond.cpp in pymol at any optimization higher than
-O0 on darwin?

https://bugs.llvm.org/show_bug.cgi?id=37280

The problem is suppressed with -fno-strict-aliasing so I am wondering if
there is some code in that file that could be re-organized to avoid the
bug. Unfortunately, the ICE doesn't seem to  indicate what line in the
source file triggered the compiler segfault.
               Jack
ps Oddly the same reproducer seems to not trigger the issue on x86_64
ubuntu bionic Linux.
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