From: Paul Eggert <eggert@cs.ucla.edu>
Date: Wed, 2 Feb 2005 23:47:34 +0000 (+0000)
Subject: (Limitations of Usual Tools): Unicos 9 sed limitations.
X-Git-Tag: AUTOCONF-2.59c~472
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=fda63f71a774e97313f7cde76ae908da682d0a12;p=thirdparty%2Fautoconf.git

(Limitations of Usual Tools): Unicos 9 sed limitations.
---

diff --git a/doc/autoconf.texi b/doc/autoconf.texi
index 96c02c4fb..39f7362bd 100644
--- a/doc/autoconf.texi
+++ b/doc/autoconf.texi
@@ -11855,6 +11855,12 @@ Patterns should not include the separator (unless escaped), even as part
 of a character class.  In conformance with Posix, the Cray
 @command{sed} will reject @samp{s/[^/]*$//}: use @samp{s,[^/]*$,,}.
 
+Avoid empty patterns within parentheses (i.e., @samp{\(\)}).  Posix is
+silent on whether they are allowed, and Unicos 9 @command{sed} rejects
+them.
+
+Unicos 9 @command{sed} loops endlessly on patterns like @samp{.*\n.*}.
+
 Sed scripts should not use branch labels longer than 8 characters and
 should not contain comments.