/usr/lib/klibc/include/klibc/extern.h is in libklibc-dev 2.0.4-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 | /*
* klibc/extern.h
*/
#ifndef _KLIBC_EXTERN_H
#define _KLIBC_EXTERN_H
#ifdef __cplusplus
#define __extern extern "C"
#else
#define __extern extern
#endif
#define __alias(x) __attribute__((weak, alias(x)))
#endif /* _KLIBC_EXTERN_H */
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