The GNU folks have released version 4.0 of the venerable GCC compiler with built-in support for the C, C++, Objective-C, Ada, Fortran, and Java programming languages.

The biggest general change is the completely new intermediate language representation based on tree SSA. SSA (Static, Single Assignment) is a modern approach to the intermediate representation of the parsed programs which allows for a much more sane and aggressive approach to optimization.

On the Java front, the GCJ sub-project has made major improvements including better support of AWT and Swing and a lot more of the other Java libraries such as java.util.regex. If you didn't know, GCC can generate native (machine-specific) binaries directly from Java code.

Check out the ChangeLog for more details.