/usr/m68k-linux-gnu/include/linux/stddef.h is in linux-libc-dev-m68k-cross 4.9.25-1cross1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | #ifndef __always_inline
#define __always_inline __inline__
#endif
|