Manage too add to  llvm/clang5  support for QNX650. I don't know what I,m doing, but it managed to compile ( still using
 QNX linker though) our softwares and passing all of the tests !!!  Which surprised me.

I was hopping for faster build time than gcc 4.8.3 but so far they are very similar.

If anyone is interested to play with it I could post patches I guess. It's surprisingly, well to me at least, how little
 changes it took.  Should be very simple to  get it to work for QNX660 / QNX700. 

Only clang/clang++ is working, no libcxx no linker, sanitizer, etc, that seems more complicated.

ntox86-gdb has no problem debugging clang generated exe.