per model (that in some ways inspired the libstdc++ debug mode
  design), although at the time of this writing the debug mode is
  somewhat incomplete and meets only the "Full user recompilation" (2)
  recompilation guarantee by requiring the user to link against a
  different library in debug mode vs. release mode.</p></li><li class="listitem"><p>Metrowerks CodeWarrior: The C++ standard library
  that ships with Metrowerks CodeWarrior includes a debug mode. It is
  a full debug-mode implementation (includi