/usr/include/astrometry/keywords.h is in libastrometry-dev 0.70+dfsg-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# This file is part of the Astrometry.net suite.
# Licensed under a 3-clause BSD style license - see LICENSE
*/
// borrowed from http://rlove.org/log/2005102601.
#ifndef ASTROMETRY_KEYWORDS_H
#define ASTROMETRY_KEYWORDS_H
#define ATTRIB_FORMAT(style,fmt,start) __attribute__ ((format(style,fmt,start)))
// this snippet borrowed from GNU libc features.h:
#if defined __GNUC__
# define GNUC_PREREQ(maj, min) \
((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
#else
# define GNUC_PREREQ(maj, min) 0
#endif
#if GNUC_PREREQ (3, 0)
// Clang masquerades as gcc but isn't compatible. Someone should file a
// lawsuit. Clang treats inlining differently; see
// http://clang.llvm.org/compatibility.html#inline
#if defined __clang__ || GNUC_PREREQ (5, 0)
// After gcc 5.0, -std=gnu11 is the default (vs -std=gnu89 in previous
// versions). This affects inlining semantics, among other things.
#define InlineDeclare
#define InlineDefineH
#define InlineDefineC
#else
// plain old gcc
#define INCLUDE_INLINE_SOURCE 1
#define InlineDeclare extern inline
#define InlineDefineH extern inline
#define InlineDefineC
#endif
// See:
// http://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html
# define Inline inline
# define Pure __attribute__ ((pure))
# define Const __attribute__ ((const))
# define Noreturn __attribute__ ((noreturn))
# define Malloc __attribute__ ((malloc))
# define Used __attribute__ ((used))
# define Unused __attribute__ ((unused))
# define VarUnused __attribute__ ((unused))
# define Packed __attribute__ ((packed))
# define likely(x) __builtin_expect (!!(x), 1)
# define unlikely(x) __builtin_expect (!!(x), 0)
# define Noinline __attribute__ ((noinline))
// alloc_size
// new in gcc-3.1:
#if GNUC_PREREQ (3, 1)
# define Deprecated __attribute__ ((deprecated))
#else
# define Deprecated
#endif
// new in gcc-3.4:
#if GNUC_PREREQ (3, 4)
# define Must_check __attribute__ ((warn_unused_result))
# define WarnUnusedResult __attribute__ ((warn_unused_result))
#else
# define Must_check
# define WarnUnusedResult
#endif
// new in gcc-4.1:
#if GNUC_PREREQ (4, 1)
#if defined __clang__
// clang complains very loudly about this being ignored...
# define Flatten
#else
# define Flatten __attribute__ (( flatten))
#endif
#else
# define Flatten
#endif
#else
// not gnuc >= 3.0
# define Inline
# define Pure
# define Const
# define Noreturn
# define Malloc
# define Must_check
# define Deprecated
# define Used
# define Unused
# define VarUnused
# define Packed
# define likely(x) (x)
# define unlikely(x) (x)
# define Noinline
# define WarnUnusedResult
# define Flatten
#endif
#endif // ASTROMETRY_KEYWORDS_H
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