Refactor logging, improve error handling workflow, clang-format. (#3385)

scripts/tidy.sh

@@ -7,12 +7,16 @@ set -o nounset
 # Runs the Clang Tidy Tool in parallel on the code base.
 # Requires a compilation database in the build directory.
 
+# This works on both OSX and Linux, it's a POSIX thingy
+NPROC=$(getconf _NPROCESSORS_ONLN)
 
-find src include unit_tests -type f -name '*.hpp' -o -name '*.cpp' \
+
+find src include unit_tests -type f -name '*.hpp' -o -name '*.cpp' -print0 \
   | xargs \
+      -0 \
       -I{} \
-      -P $(nproc) \
-      clang-tidy \
+      -n 1 \
+      ./clang+llvm-3.9.0-x86_64-apple-darwin/bin/clang-tidy \
         -p build \
         -header-filter='.*' \
       {}