Use "set -o posix" with pdksh, too.

diff --git a/ChangeLog b/ChangeLog
index 71d4fe61e26fa16e14525bcf9efd29396ffed9e5..9d14d6770f591757191850b74e59729ed27e8666 100644 (file)
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,11 @@
+2004-07-27  Paul Eggert  <eggert@cs.ucla.edu>
+
+       * lib/m4sugar/m4sh.m4 (_AS_BOURNE_COMPATIBLE): Use "set -o posix"
+       with pdksh, too.  Problem reported by Patrick Welche via
+       Gary V. Vaughan.
+       * doc/autoconf.texi (Shellology): Note that set -o posix is
+       useful for pkdsh, too.
+
 2004-06-24  Paul Eggert  <eggert@cs.ucla.edu>
 
        * lib/m4sugar/m4sh.m4 (_AS_DETECT_BETTER_SHELL): Require

diff --git a/doc/autoconf.texi b/doc/autoconf.texi
index 6e6bb796bd5444a93fffb31fc2c5a41cc280f73d..41e4b799f42a8f394f3477c025440d976c6ce4fe 100644 (file)
--- a/doc/autoconf.texi
+++ b/doc/autoconf.texi
@@ -9366,8 +9366,8 @@ Substitutions}, item ``Command Substitution''.
 
 @item Bash
 @cindex Bash
-To detect whether you are running @command{bash}, test if
-@code{BASH_VERSION} is set.  To disable its extensions and require
+To detect whether you are running @command{bash}, test whether
+@code{BASH_VERSION} is set.  To require
 @acronym{POSIX} compatibility, run @samp{set -o posix}.  @xref{Bash POSIX
 Mode,, Bash @acronym{POSIX} Mode, bash, The @acronym{GNU} Bash Reference
 Manual}, for details.
@@ -9407,6 +9407,9 @@ not have it.
 A public-domain clone of the Korn shell called @samp{pdksh} is also
 widely available: it has most of the @samp{ksh88} features along with
 a few of its own.
+Similarly to @command{bash}, you can detect whether you are running
+@samp{pdksh} by testing whether @code{KSH_VERSION} is set, and you can
+require @acronym{POSIX} compatibility by running @samp{set -o posix}.
 
 @item Zsh
 @cindex Zsh

diff --git a/lib/m4sugar/m4sh.m4 b/lib/m4sugar/m4sh.m4
index 480c3f3fcdd195857b890f64a4612b95c37c014a..f1ed26c40628b33b74ec77008cc1ff6fe9a2359d 100644 (file)
--- a/lib/m4sugar/m4sh.m4
+++ b/lib/m4sugar/m4sh.m4
@@ -162,7 +162,7 @@ if test -n "${ZSH_VERSION+set}" && (emulate sh) >/dev/null 2>&1; then
   # is contrary to our usage.  Disable this feature.
   alias -g '${1+"$[@]"}'='"$[@]"'
   setopt NO_GLOB_SUBST
-elif test -n "${BASH_VERSION+set}" && (set -o posix) >/dev/null 2>&1; then
+elif test -n "${BASH_VERSION+set}${KSH_VERSION+set}" && (set -o posix) >/dev/null 2>&1; then
   set -o posix
 fi
 DUALCASE=1; export DUALCASE # for MKS sh