* Remove unsupported MMAP_STACKS (specific to Solaris threads).
* Remove unused ancient SILENT, __STDC__, NO_SIGNALS macros.
* Replace ARGSUSED comment-based annotation with GCC 'unused' attribute.
+* Replace GC_ms_entry declaration with opaque definition for public API.
* Replace long GC_markers global variable with int GC_markers_m1.
* Replace pointer relational comparisons with non-pointer ones.
* Replace printf PRIxMAX specifier with '%p' for thread id debug output.
* Fix configure to disable GCC aliasing optimization unless forced to.
* Fix duplicate definitions in gcconfig.h for NetBSD.
* Fix fork() support on Cygwin and Darwin targets.
+* Fix gc.h compatibility regression regarding GC_PTR, GC_I_HIDE_POINTERS.
* Fix gc_cpp.cc for Cygwin (remove duplicate function definition).
* Fix gcconfig.h to define USE_GET_STACKBASE_FOR_MAIN for Android.
* Fix gcconfig.h to handle mips64-linux target.
* Fix tests to check GC_malloc result for NULL (out-of-memory).
* Fix thread model in configure for MinGW ("win32" instead of "posix").
* Fix various warnings reported by LINT-like tools.
+* Fix visibility of some GC internal symbols used by GNU GCJ currently.
* Port some thread tests to Win32.
* Refine API GC setters and getter comments regarding locking.
* Refine GC_stackbottom description in gc.h.