ada@gentoo.org Build the ADA language (GNAT) frontend Used to bootstrap gnat-gpl Enable support for Intel Control Flow Enforcement Technology (CET) Enable support for the D programming language Enable fixed-point arithmetic support for MIPS targets in gcc (Warning: significantly increases compile time!) Build the GCC Go language frontend. Add support for the framework for loop optimizations based on a polyhedral intermediate representation Build SSP support into a dedicated library rather than use the code in the C library (DO NOT ENABLE THIS IF YOU DON'T KNOW WHAT IT DOES) Build using Link Time Optimizations (LTO) Enable support for Native POSIX Threads Library, the new threading module (requires linux-2.6 or better usually) Build support for the Objective C code language Build support for the Objective C++ language Build support for the Objective C code language Garbage Collector Build GCC using Profile Guided Optimization (PGO) Build support for various sanitizer functions (ASAN/TSAN/etc...) enable systemtap static probe points Build packages with stack smashing protector on by default Build support for virtual table verification (a C++ hardening feature)