[C] Linux GNU Extensions to the C Language Family

Linux有一些C語言的用法並不是標準C語言,其定義在下面文件

6 Extensions to the C Language Family
https://gcc.gnu.org/onlinedocs/gcc/C-Extensions.html


6.29 Designated Initializers
https://gcc.gnu.org/onlinedocs/gcc/Designated-Inits.html