Mark Mitchell announced the availability of GCC 4.0.1, officially released on July 7'th. He explains, "this release is a minor release, containing primarily fixes for regressions in GCC 4.0.0 relative to previous releases." GCC 4.0.0 was released two and a half months ago on April 20th, as seen on the official release timeline. A list of bug fixes in 4.0.1 can be found here.

GCC is the GNU Compiler Collection which includes C, C++, Objective-C, Fortran, Java, and Ada compilers. Download GCC 4.0.1 from a gcc.gnu.org mirror.