From: Paul Eggert <eggert@cs.ucla.edu>
Date: Fri, 29 Apr 2005 22:05:14 +0000 (+0000)
Subject: (Limitations of Builtins): Describe "set -" problems.
X-Git-Tag: AUTOCONF-2.59c~404
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=312fdf37509d15ea831b4faf0644f0508fffa40d;p=thirdparty%2Fautoconf.git

(Limitations of Builtins): Describe "set -" problems.
---

diff --git a/doc/autoconf.texi b/doc/autoconf.texi
index 89f8f6581..d0f531415 100644
--- a/doc/autoconf.texi
+++ b/doc/autoconf.texi
@@ -11180,9 +11180,14 @@ processing as soon as a non-option argument is found.  Therefore, use
 set x $my_list; shift
 @end example
 
-Some shells have the "opposite" problem of not recognizing all options
+Avoid @samp{set -}, e.g., @samp{set - $my_list}.  POSIX 1003.1-2001 no
+longer requires support for this command, and in traditional shells
+@samp{set - $my_list} resets the @samp{-v} and @samp{-x} options, which
+makes scripts harder to debug.
+
+Some nonstandard shells do not recognize more than one option
 (e.g., @samp{set -e -x} assigns @samp{-x} to the command line).  It is
-better to elide these:
+better to combine them:
 
 @example
 set -ex