- The Undefined Behavior Sanitizer has been ported to GCC.
- ADA and Fortran have seen upgrades.
- Improved C++14 support.
- - RX100, RX200, and RX600 processor support by GCC.
- Intel Silvermont hardware support.
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Thus spake the master programmer: "When a program is being tested, it is too late to make design changes." -- Geoffrey James, "The Tao of Programming"