I did log it as a bug but thought I'd mention it here:
This is from the ITK project (www.itk.org) -- well, actually the
version of GDCM2 incorporated into ITK.
I do regular builds using the SVN Trunk version of CLang of our
largish C++ software suite for image processing, which includes
building several prerequisite libraries.
Today I updated LLVM, CLang, and Compiler-rt and built them, then
rebuilt our software. I don't regularly use optimized builds (as I'm
usually debugging things), but today I tried an optimized build of ITK
and it crashes clang.
Maybe the bug report was sufficient, but this was an unusual event in
my experience. CLang trunk versions have seemed pretty solid over the
past few months.