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/usr/aarch64-linux-gnu/include/bits/mathinline.h is in libc6-dev-arm64-cross 2.27-3ubuntu1cross1.

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/* This file should provide inline versions of math functions.

   Surround GCC-specific parts with #ifdef __GNUC__, and use `__extern_inline'.

   This file should define __MATH_INLINES if functions are actually defined as
   inlines.  */

#if !defined __NO_MATH_INLINES && defined __OPTIMIZE__

/* Here goes the real code.  */

#endif