test-getopt: test stderr behavior

[pspp] / doc / glibc-functions / getopt_long.texi

diff --git a/doc/glibc-functions/getopt_long.texi b/doc/glibc-functions/getopt_long.texi
index a0f8cf4cb78f1ab346dfbf698f4b0641a5982fb3..0472514b5685b97a782b6f7c5fc0b16ebea85158 100644 (file)
--- a/doc/glibc-functions/getopt_long.texi
+++ b/doc/glibc-functions/getopt_long.texi
@@ -33,4 +33,7 @@ Portability problems not fixed by Gnulib:
 The glibc extension of using @samp{W;} in the optstring argument to
 allow @code{-W foo} to behave synonymously with @code{--foo} is not
 very reliable, even in glibc.
+@item
+Mixing a leading @samp{-} or @samp{+} with a leading @samp{:} in the
+optstring argument has inconsistent effects across platforms.
 @end itemize