Release Notes: The new link-time optimizer LTO ("-flto") is now also supported on several non-ELF targets, namely Cygwin (*-cygwin*), MinGW (*-mingw*), and Darwin on x86-64 (x86_64-apple-darwin*), though LTO is not enabled by default for these targets. Numerous minor bugs were fixed.
Release Notes: Many optimizer improvements were made. Version 3.0 of the OpenMP specification is now supported for the C, C++, and Fortran compilers. "Uninitialized" warnings do not require enabling optimization anymore. The experimental support for the upcoming ISO C++ standard C++0x was improved. Several new targets and target specific improvements were introduced, while several old targets were obsoleted or removed. Many bugs were fixed.
Release Notes: This release contains fixes for regressions in 4.2.2 relative to previous releases.
Release Notes: General optimizer improvements were made. OpenMP support was added. Various bugs were fixed. Other improvements and changes were done.
Release Notes: Numerous new features, improvements, bugfixes, and other changes.