When downloading sources for an
The older versions receive bug fixes only, while new features are implemented in the newer versions. From https://gcc.gnu.org/releases.html:
The table is sorted by date. Note that starting with version 3.3.4, we provide bug releases for older release branches for those users who require a very high degree of stability.
If you like it graphicly (ASCII-ART): https://gcc.gnu.org/develop.html#timeline