An Extensive Look At The Changes Of GCC 5
There's been dozens of Phoronix articles covering GCC 5 development and features over the past year, including the recent concise summary of new GCC 5 features and improvements. However, if you're really interested in compilers and the low-level details about the work that's been invested into the GNU Compiler Collection over the past year, Honza has out a great blog post.
If you have the time to read it all, check out Honza's latest blog post that closely covers the significant changes for GCC 5. It's a very interesting read.