@node copysign
@section @code{copysign}
@findex copysign

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

Gnulib module: copysign

Portability problems fixed by Gnulib:
@itemize
@item
This function is missing on some platforms:
Minix 3.1.8, MSVC 9.
@end itemize

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