/usr/include/likely.h is in libowfat-dev 0.30-2ubuntu1.
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 | #ifdef __dietlibc__
#include <sys/cdefs.h>
#else
#if __GNUC__ < 3
#define __expect(foo,bar) (foo)
#else
#define __expect(foo,bar) __builtin_expect((long)(foo),bar)
#endif
#define __likely(foo) __expect((foo),1)
#define __unlikely(foo) __expect((foo),0)
#endif
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