Right, I do think clang is a godsend. Finally reasonable error messages, modern compiler technology, you can interface it with tools for "intellisense" and syntax highlighting in many editors, ...

I have the "pleasure" to work with something called ROOT, which is a data analysis toolkit for particle physics. One major component is the C++ interpreter CINT. Now you can imagine a C++ interpreter is a very bad thing. Subtle differences in execution, scripts that are almost valid C++ code but not quite, etc.. ROOT tried to offload some parsing to GCC via GCC-XML, but IIRC that didn't work so well, and GCC-XML was also doomed for political reasons (RMS didn't want a stable interface to the internals of GCC, so that nobody could interface it with closed-source code). With the new version of ROOT however, they are moving to a clang based interpreter, which means much less bizarre bugs due to corner cases of C++.

(originally by Masaharu Goto, which lead to the saying "Masaharu Goto Considered Harmful"... I don't mean to offend that guy though)