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@node logb
@section @code{logb}
@findex logb
POSIX specification:@* @url{https://pubs.opengroup.org/onlinepubs/9699919799/functions/logb.html}
Gnulib module: logb
Portability problems fixed by Gnulib:
@itemize
@item
This function is missing on some platforms:
Minix 3.1.8, MSVC 9.
@item
This function is missing a declaration on some platforms:
Cygwin 1.5.x.
@item
This function produces wrong results for subnormal numbers on some platforms:
glibc 2.17/ppc, glibc 2.7/sparc, glibc 2.7/hppa, Solaris 11.4, Cygwin 1.5.x.
@end itemize
Portability problems not fixed by Gnulib:
@itemize
@end itemize
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