log: Work around OSF/1 5.1 bug. * lib/math.in.h (log): New declaration. * lib/log.c: New file. * m4/log.m4 (gl_FUNC_LOG_WORKS): New macro. (gl_FUNC_LOG): Invoke it. Set REPLACE_LOG. * m4/math_h.m4 (gl_MATH_H): Test whether log is declared. (gl_MATH_H_DEFAULTS): Initialize GNULIB_LOG, REPLACE_LOG. * modules/math (Makefile.am): Substitute GNULIB_LOG, REPLACE_LOG. * modules/log (Files): Add lib/log.c. (Depends-on): Add math. (configure.ac): If REPLACE_LOG is 1, compile an override. * tests/test-math-c++.cc: Check the declaration of log. * doc/posix-functions/log.texi: Mention the OSF/1 5.1 problem.

@node log
@section @code{log}
@findex log

POSIX specification:@* @url{http://www.opengroup.org/onlinepubs/9699919799/functions/log.html}

Gnulib module: log

Portability problems fixed by Gnulib:
@itemize
@item
This function returns a wrong value for a minus zero argument on some platforms:
OSF/1 5.1.
@end itemize

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