Look for clangstdstring_core.tar.gz on support.
I got a core when I tried to debug (F5) this project. core file is in the uploaded tarball.
I think I had a breakpoint on line 6 of clangstdstring.cpp. core dump did not reproduce when I tried it a 2nd time.
You can try to build it first, then do a debug.
It is a clang++ compiled project, but debugged with gdb. Using gdb to debug clang++ compiled projects seems to work with other programs, and also using eclipse debugger.