This file is indexed.

/usr/share/include-what-you-use/gcc.symbols.imp is in iwyu 5.0-1.

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

The actual contents of the file can be viewed below.

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# For library symbols that can be defined in more than one header
# file, maps from symbol-name to legitimate header files.
# This list was generated via
# grep -R '__.*_defined' /usr/include | perl -nle 'm,/usr/include/([^:]*):#\s*\S+ __(.*)_defined, and print qq@    { symbol: [ "$2", public, "<$1>", public ] },@' | sort -u
# I ignored all entries that only appeared once on the list (eg uint32_t).
# I then added in NULL, which according to [diff.null] C.2.2.3, can
# be defined in <clocale>, <cstddef>, <cstdio>, <cstdlib>,
# <cstring>, <ctime>, or <cwchar>.  We also allow their C
# equivalents.
# In each case, I ordered them so <sys/types.h> was first, if it was
# an option for this type.  That's the preferred #include all else
# equal.  The visibility on the symbol-name is ignored; by convension
# we always set it to private.
[
  { symbol: [ "blksize_t", private, "<sys/types.h>", public ] },
  { symbol: [ "blkcnt_t", private, "<sys/stat.h>", public ] },
  { symbol: [ "blkcnt_t", private, "<sys/types.h>", public ] },
  { symbol: [ "blksize_t", private, "<sys/stat.h>", public ] },
  { symbol: [ "daddr_t", private, "<sys/types.h>", public ] },
  { symbol: [ "daddr_t", private, "<rpc/types.h>", public ] },
  { symbol: [ "dev_t", private, "<sys/types.h>", public ] },
  { symbol: [ "dev_t", private, "<sys/stat.h>", public ] },
  { symbol: [ "error_t", private, "<errno.h>", public ] },
  { symbol: [ "error_t", private, "<argp.h>", public ] },
  { symbol: [ "error_t", private, "<argz.h>", public ] },
  { symbol: [ "fsblkcnt_t", private, "<sys/types.h>", public ] },
  { symbol: [ "fsblkcnt_t", private, "<sys/statvfs.h>", public ] },
  { symbol: [ "fsfilcnt_t", private, "<sys/types.h>", public ] },
  { symbol: [ "fsfilcnt_t", private, "<sys/statvfs.h>", public ] },
  { symbol: [ "gid_t", private, "<sys/types.h>", public ] },
  { symbol: [ "gid_t", private, "<grp.h>", public ] },
  { symbol: [ "gid_t", private, "<pwd.h>", public ] },
  { symbol: [ "gid_t", private, "<stropts.h>", public ] },
  { symbol: [ "gid_t", private, "<sys/ipc.h>", public ] },
  { symbol: [ "gid_t", private, "<sys/stat.h>", public ] },
  { symbol: [ "gid_t", private, "<unistd.h>", public ] },
  { symbol: [ "id_t", private, "<sys/types.h>", public ] },
  { symbol: [ "id_t", private, "<sys/resource.h>", public ] },
  { symbol: [ "ino64_t", private, "<sys/types.h>", public ] },
  { symbol: [ "ino64_t", private, "<dirent.h>", public ] },
  { symbol: [ "ino_t", private, "<sys/types.h>", public ] },
  { symbol: [ "ino_t", private, "<dirent.h>", public ] },
  { symbol: [ "ino_t", private, "<sys/stat.h>", public ] },
  { symbol: [ "int8_t", private, "<sys/types.h>", public ] },
  { symbol: [ "int8_t", private, "<stdint.h>", public ] },
  { symbol: [ "intptr_t", private, "<stdint.h>", public ] },
  { symbol: [ "intptr_t", private, "<unistd.h>", public ] },
  { symbol: [ "key_t", private, "<sys/types.h>", public ] },
  { symbol: [ "key_t", private, "<sys/ipc.h>", public ] },
  { symbol: [ "mode_t", private, "<sys/types.h>", public ] },
  { symbol: [ "mode_t", private, "<sys/stat.h>", public ] },
  { symbol: [ "mode_t", private, "<sys/ipc.h>", public ] },
  { symbol: [ "mode_t", private, "<sys/mman.h>", public ] },
  { symbol: [ "nlink_t", private, "<sys/types.h>", public ] },
  { symbol: [ "nlink_t", private, "<sys/stat.h>", public ] },
  { symbol: [ "off64_t", private, "<sys/types.h>", public ] },
  { symbol: [ "off64_t", private, "<unistd.h>", public ] },
  { symbol: [ "off_t", private, "<sys/types.h>", public ] },
  { symbol: [ "off_t", private, "<unistd.h>", public ] },
  { symbol: [ "off_t", private, "<sys/stat.h>", public ] },
  { symbol: [ "off_t", private, "<sys/mman.h>", public ] },
  { symbol: [ "pid_t", private, "<sys/types.h>", public ] },
  { symbol: [ "pid_t", private, "<unistd.h>", public ] },
  { symbol: [ "pid_t", private, "<signal.h>", public ] },
  { symbol: [ "pid_t", private, "<sys/msg.h>", public ] },
  { symbol: [ "pid_t", private, "<sys/shm.h>", public ] },
  { symbol: [ "pid_t", private, "<termios.h>", public ] },
  { symbol: [ "pid_t", private, "<time.h>", public ] },
  { symbol: [ "pid_t", private, "<utmpx.h>", public ] },
  { symbol: [ "sigset_t", private, "<signal.h>", public ] },
  { symbol: [ "sigset_t", private, "<sys/epoll.h>", public ] },
  { symbol: [ "sigset_t", private, "<sys/select.h>", public ] },
  { symbol: [ "socklen_t", private, "<bits/socket.h>", private ] },
  { symbol: [ "socklen_t", private, "<unistd.h>", public ] },
  { symbol: [ "socklen_t", private, "<arpa/inet.h>", public ] },
  { symbol: [ "ssize_t", private, "<sys/types.h>", public ] },
  { symbol: [ "ssize_t", private, "<unistd.h>", public ] },
  { symbol: [ "ssize_t", private, "<monetary.h>", public ] },
  { symbol: [ "ssize_t", private, "<sys/msg.h>", public ] },
  { symbol: [ "suseconds_t", private, "<sys/types.h>", public ] },
  { symbol: [ "suseconds_t", private, "<sys/time.h>", public ] },
  { symbol: [ "suseconds_t", private, "<sys/select.h>", public ] },
  { symbol: [ "u_char", private, "<sys/types.h>", public ] },
  { symbol: [ "u_char", private, "<rpc/types.h>", public ] },
  { symbol: [ "uid_t", private, "<sys/types.h>", public ] },
  { symbol: [ "uid_t", private, "<unistd.h>", public ] },
  { symbol: [ "uid_t", private, "<pwd.h>", public ] },
  { symbol: [ "uid_t", private, "<signal.h>", public ] },
  { symbol: [ "uid_t", private, "<stropts.h>", public ] },
  { symbol: [ "uid_t", private, "<sys/ipc.h>", public ] },
  { symbol: [ "uid_t", private, "<sys/stat.h>", public ] },
  { symbol: [ "useconds_t", private, "<sys/types.h>", public ] },
  { symbol: [ "useconds_t", private, "<unistd.h>", public ] },
  # glob.h seems to define size_t if necessary, but it should come from stddef.
  { symbol: [ "size_t", private, "<stddef.h>", public ] },
  { symbol: [ "size_t", private, "<stdio.h>", public ] },
  { symbol: [ "size_t", private, "<stdlib.h>", public ] },
  { symbol: [ "size_t", private, "<string.h>", public ] },
  { symbol: [ "size_t", private, "<time.h>", public ] },
  { symbol: [ "size_t", private, "<wchar.h>", public ] },
  # Macros that can be defined in more than one file, don't have the
  # same __foo_defined guard that other types do, so the grep above
  # doesn't discover them.  Until I figure out a better way, I just
  # add them in by hand as I discover them.
  { symbol: [ "EOF", private, "<stdio.h>", public ] },
  { symbol: [ "EOF", private, "<libio.h>", public ] },
  { symbol: [ "FILE", private, "<stdio.h>", public ] },
  { symbol: [ "va_list", private, "<stdarg.h>", public ] },
  # These are symbols that could be defined in either stdlib.h or
  # malloc.h, but we always want the stdlib location.
  { symbol: [ "malloc", private, "<stdlib.h>", public ] },
  { symbol: [ "calloc", private, "<stdlib.h>", public ] },
  { symbol: [ "realloc", private, "<stdlib.h>", public ] },
  { symbol: [ "free", private, "<stdlib.h>", public ] },
  # Entries for NULL
  { symbol: [ "NULL", private, "<stddef.h>", public ] },  # 'canonical' location for NULL
  { symbol: [ "NULL", private, "<clocale>", public ] },
  { symbol: [ "NULL", private, "<cstddef>", public ] },
  { symbol: [ "NULL", private, "<cstdio>", public ] },
  { symbol: [ "NULL", private, "<cstdlib>", public ] },
  { symbol: [ "NULL", private, "<cstring>", public ] },
  { symbol: [ "NULL", private, "<ctime>", public ] },
  { symbol: [ "NULL", private, "<cwchar>", public ] },
  { symbol: [ "NULL", private, "<locale.h>", public ] },
  { symbol: [ "NULL", private, "<stdio.h>", public ] },
  { symbol: [ "NULL", private, "<stdlib.h>", public ] },
  { symbol: [ "NULL", private, "<string.h>", public ] },
  { symbol: [ "NULL", private, "<time.h>", public ] },
  { symbol: [ "NULL", private, "<wchar.h>", public ] },

  # Kludge time: almost all STL types take an allocator, but they
  # almost always use the default value.  Usually we detect that
  # and don't try to do IWYU, but sometimes it passes through.
  # For instance, when adding two strings, we end up calling
  #    template<_CharT,_Traits,_Alloc> ... operator+(
  #       basic_string<_CharT,_Traits,_Alloc>, ...)
  # These look like normal template args to us, so we see they're
  # used and declare an iwyu dependency, even though we don't need
  # to #include the traits or alloc type ourselves.  The surest way
  # to deal with this is to just say that everyone provides
  # std::allocator.  We can add more here at need.
  { symbol: [ "std::allocator", private, "<memory>", public ] },
  { symbol: [ "std::allocator", private, "<string>", public ] },
  { symbol: [ "std::allocator", private, "<vector>", public ] },
  { symbol: [ "std::allocator", private, "<map>", public ] },
  { symbol: [ "std::allocator", private, "<set>", public ] },
  # A similar kludge for std::char_traits.  basic_string,
  # basic_ostream and basic_istream have this as a default template
  # argument, and sometimes it bleeds through when clang desugars the
  # string/ostream/istream type.
  { symbol: [ "std::char_traits", private, "<string>", public ] },
  { symbol: [ "std::char_traits", private, "<ostream>", public ] },
  { symbol: [ "std::char_traits", private, "<istream>", public ] }
]