doc: Mention reason for replacement on glibc/Linux systems.

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

diff --git a/doc/posix-functions/fprintf.texi b/doc/posix-functions/fprintf.texi
index 40525c0..9a01ddb 100644 (file)
--- a/doc/posix-functions/fprintf.texi
+++ b/doc/posix-functions/fprintf.texi
@@ -20,6 +20,10 @@ printf @code{"%f"}, @code{"%e"}, @code{"%g"} of Infinity and NaN yields an
 incorrect result on some platforms:
 AIX 5.2, OSF/1 5.1, Solaris 11 2011-11, mingw, MSVC 9.
 @item
+printf of @samp{long double} numbers outside the IEEE 754 range produces
+no meaningful results on some platforms:
+glibc and others, on x86, x86_64, IA-64 CPUs.
+@item
 This function does not support the @samp{a} and @samp{A} directives on some
 platforms:
 glibc-2.3.6, MacOS X 10.5, NetBSD 5.0, OpenBSD 4.0, AIX 5.2, HP-UX 11,