Among other novelties, it includes support for OS X 10.6 or Snow Leopard, full support for the latest versions of Solaris, weak pointers, and a new model for handling signals.
However, until we transition to the upcoming release of the Boehm-Weiser library, the
following problems persist:
NetBSD and Open only work in single-threaded mode because 1) the version of the garbage collector shipped with it does not support GC_register_my_thread and 2) the version of the garbage collector shipped with ECL fails to build (it gets locked when looking for a working fork())
The mingw32 port only builds in multithreaded mode when using the unstable release of the garbage collector (v7.2)
As usual, refer to http://ecls.sourceforge.net for downloading, reading the manual, or browsing unstable versions.