Liangxu Linux

Aug 14, 2023 · Backend Development

Mastering GNU C Extensions: typeof, Zero‑Length Arrays, and More in the Linux Kernel

This article explains key GNU C extensions used in the Linux kernel—including typeof, zero‑length (flexible) arrays, case ranges, labeled initializers, variadic macros, function and variable attributes, built‑in functions, asmlinkage, and UL suffixes—showing why they exist, how to use them safely, and providing concrete code examples.