message: Switch the OSS build to C++14 by default.
diff: @@ -127,6 +127,9 @@ build:c++17 --cxxopt=-std=c++1z
  build:c++17 --cxxopt=-stdlib=libc++
  build:c++1z --config=c++17
  +# By default, build TF in C++ 14 mode.
  +build --cxxopt=-std=c++14
  +
  # Default paths for TF_SYSTEM_LIBS
  build --define=PREFIX=/usr
  build --define=LIBDIR=$(PREFIX)/lib
  