* Disable find-leak GC_gcollect on GC abnormal EXIT.
* Elaborate comment on dependencies in autogen.sh.
* Eliminate 'missing exception specification' warning in gc_cpp.cc (Clang).
+* Eliminate Clang warning for GC_pthread_exit attribute.
* Eliminate GCC warning in GC_get_main_stack_base (OpenBSD).
* Eliminate GCC warnings in setjmp_t.c, test_cpp and cord 'de' app.
* Include "config.h" instead of "private/config.h" on HAVE_CONFIG_H.
* Recognize GC_SIG_SUSPEND and GC_SIG_THR_RESTART tuning macros in gc.h.
* Replace SIG_SUSPEND/THR_RESTART macros to variables in pthread_stop_world.
* Replace sprintf with defensive snprintf.
+* Replace var-args GC_noop with GC_noop6 (to eliminate Clang warning).
* Turn off GC_LOOP_ON_ABORT functionality if GC compiled with NO_DEBUGGING.
* Use memcpy (BCOPY) instead of strcpy (to suppress GCC warning).