/usr/lib/bcc/include/features.h is in elks-libc 0.16.17-3.2.
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 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 | #ifndef __FEATURES_H
#define __FEATURES_H
#ifdef __STDC__
#define __P(x) x
#define __const const
/* Not really ansi */
#ifdef __BCC__
#define const
#define volatile
#endif
#else /* K&R */
#define __P(x) ()
#define __const
#define const
#define volatile
#endif
/* Pick an OS sysinclude directory */
/* Use with #include __SYSINC__(errno.h) */
#ifdef __ELKS__
#define __SYSINC__(_h_file_) <linuxmt/_h_file_>
#endif
#ifdef __linux__
#undef linux /* Eyuk! */
#define __SYSINC__(_h_file_) <linux/_h_file_>
#endif
#ifdef __MSDOS__
#define __SYSINC__(_h_file_) <msdos/_h_file_>
#endif
#ifndef __SYSINC__
#define __SYSINC__(_h_file_) <generic/_h_file_>
#endif
/* No C++ */
#define __BEGIN_DECLS
#define __END_DECLS
/* GNUish things */
#define __CONSTVALUE
#define __CONSTVALUE2
#include <sys/cdefs.h>
#endif
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