@node signbit
@section @code{signbit}
@findex signbit

POSIX specification:@* @url{https://pubs.opengroup.org/onlinepubs/9699919799/functions/signbit.html}

Gnulib module: signbit

Portability problems fixed by Gnulib:
@itemize
@item
This function is missing on some platforms:
macOS 11.1, OpenBSD 6.7, AIX 5.1, IRIX 6.5, Solaris 11.0, MSVC 9, Android 9.0.
@end itemize

Portability problems not fixed by Gnulib:
@itemize
@end itemize