log2-ieee: Work around test failure on NetBSD 5.1 and Solaris 10.

[gnulib.git] / doc / posix-functions / log2.texi

diff --git a/doc/posix-functions/log2.texi b/doc/posix-functions/log2.texi
index 0aafa2c..c943238 100644 (file)
--- a/doc/posix-functions/log2.texi
+++ b/doc/posix-functions/log2.texi
@@ -4,19 +4,35 @@
 
 POSIX specification:@* @url{http://www.opengroup.org/onlinepubs/9699919799/functions/log2.html}
 
-Gnulib module: ---
+Gnulib module: log2 or log2-ieee
 
-Portability problems fixed by Gnulib:
-@itemize
-@end itemize
-
-Portability problems not fixed by Gnulib:
+Portability problems fixed by either Gnulib module @code{log2} or @code{log2-ieee}:
 @itemize
 @item
 This function is missing on some platforms:
-MacOS X 10.5, FreeBSD 6.0, NetBSD 3.0, OpenBSD 3.8, AIX 5.1, IRIX 6.5,
-Solaris 9, Interix 3.5.
+FreeBSD 6.0, NetBSD 3.0, OpenBSD 3.8, Minix 3.1.8, AIX 5.1, older IRIX 6.5,
+Solaris 9, MSVC 9, Interix 3.5.
+@item
+This function is not declared on some platforms:
+IRIX 6.5.
 @item
 This function is only provided as a macro on some platforms:
 Cygwin 1.5.x.
+@item
+This function returns a wrong value for a minus zero argument on some platforms:
+OSF/1 5.1.
+@item
+This function returns slightly wrong values for exact powers of 2 on some platforms:
+Cygwin 1.7.9.
+@end itemize
+
+Portability problems fixed by Gnulib module @code{log2-ieee}:
+@itemize
+@item
+This function returns a wrong value for a negative argument on some platforms:
+NetBSD 5.1, Solaris 11 2011-11.
+@end itemize
+
+Portability problems not fixed by Gnulib:
+@itemize
 @end itemize