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

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

diff --git a/doc/posix-functions/dprintf.texi b/doc/posix-functions/dprintf.texi
index 83c95cf..b4c0555 100644 (file)
--- a/doc/posix-functions/dprintf.texi
+++ b/doc/posix-functions/dprintf.texi
@@ -17,6 +17,10 @@ IRIX 6.5, OSF/1 5.1, Solaris 11 2011-11, Cygwin 1.5.x, mingw, MSVC 9, Interix 3.
 Portability problems fixed by Gnulib module @code{dprintf-posix}:
 @itemize
 @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.