Hi all,
  Clang-folks are working on an option to automatically initialize local variables, similar to what D does.  (only local variables, not heap allocated variables)

Read this thread if you are interested in performance measurements and discussion about perf impact (currently about 1%) and compiler improvements to try to mitigate it:
https://lists.llvm.org/pipermail/cfe-dev/2019-January/060878.html

("zero-init" = initialize with all zeros, "pattern-init" = initialize with a specific bit pattern)

-Johan