This file is indexed.

/usr/include/c++/v1/support/solaris/floatingpoint.h is in libc++-dev 6.0-2.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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//===----------------------------------------------------------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

#define atof sun_atof
#define strtod sun_strtod
#include_next "floatingpoint.h"
#undef atof
#undef strtod