test-getopt: test stderr behavior

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

diff --git a/doc/glibc-functions/getopt_long_only.texi b/doc/glibc-functions/getopt_long_only.texi
index fcda30073a766babefb9bbfda5a35c849083fe91..13edfb42e622fe9678ebf8a6a25cb1528a26d28c 100644 (file)
--- a/doc/glibc-functions/getopt_long_only.texi
+++ b/doc/glibc-functions/getopt_long_only.texi
@@ -38,4 +38,7 @@ very reliable.
 Some implementations return success instead of reporting an ambiguity
 if user's option is a prefix of two long options with the same flag:
 FreeBSD.
+@item
+Mixing a leading @samp{-} or @samp{+} with a leading @samp{:} in the
+optstring argument has inconsistent effects across platforms.
 @end itemize