/usr/include/newlib/fastmath.h is in libnewlib-dev 2.4.0.20160527-3.
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 | #ifndef _FASTMATH_H_
#ifdef __cplusplus
extern "C" {
#endif
#define _FASTMATH_H_
#include <math.h>
#include <machine/fastmath.h>
#ifdef __cplusplus
}
#endif
#endif /* _FASTMATH_H_ */
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