GCC 16 Release Series Changes, New Features, and Fixes This page is a "brief" summary of some of the huge number of improvements in GCC 16. You may also want to check out our Porting to GCC 16 page and the full GCC documentation . Caveats int8_t etc. are now signed char on Solaris for conformance with the C99 standard. However, this is an incompatible change. See the porting notes for more information. The -pthread option no longer predefines _REENTRANT on Solaris. See the porting notes for more information. The so-called " json " format for -fdiagnostics-format= has been removed in this release. Users seeking machine-readable diagnostics from GCC should use SARIF . General Improvements Link-Time Optimization now supports better handling of toplevel asm statements with -flto-toplevel-asm-heuristics . Speculative devirtualization now handles general indirect function calls and supports speculating of more than one target. The vectorizer is now more flexible in identifying in-loop parallelism of reductions.…