[SCM] GNU Autoconf source repository branch, master, updated. v2.63b-44-g780a068

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- Log -----------------------------------------------------------------
commit 780a068d297868cf3dd617ef12676cbfc3a05862
Author: Eric Blake <[email protected]>
Date:   Mon May 4 10:30:16 2009 -0600

    Document zsh bug with empty commands.
    
    * doc/autoconf.texi (Special Shell Variables) <?>: Add mention of
    more problems with $?.

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog         |    6 ++++++
 doc/autoconf.texi |   15 +++++++++++++++
 2 files changed, 21 insertions(+), 0 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index e6e8892..88f4171 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2009-05-13  Eric Blake  <[email protected]>
+
+	Document zsh bug with empty commands.
+	* doc/autoconf.texi (Special Shell Variables) <?>: Add mention of
+	more problems with $?.
+
 2009-05-11  Patrick Welche  <[email protected]>  (tiny change)
 
 	Also try X11R7 when looking for X11 files, for NetBSD.
diff --git a/doc/autoconf.texi b/doc/autoconf.texi
index a4bb429..928b417 100644
--- a/doc/autoconf.texi
+++ b/doc/autoconf.texi
@@ -14925,6 +14925,20 @@ underscores.
 
 @c Alphabetical order, case insensitive, `A' before `a'.
 @table @code
+@item ?
+Not all shells correctly reset @samp{$?} after conditionals (@pxref{if,
+, Limitations of Shell Builtins}).  Not all shells manage @samp{$?}
+correctly in shell functions (@pxref{Shell Functions}) or in traps
+(@pxref{trap, , Limitations of Shell Builtins}).  Not all shells reset
+@samp{$?} to zero after an empty command.
+
+@example
+$ @kbd{bash -c 'false; $empty; echo $?'}
+0
+$ @kbd{zsh -c 'false; $empty; echo $?'}
+1
+@end example
+
 @item _
 Many shells reserve @samp{$_} for various purposes, e.g., the name of
 the last command executed.
@@ -15850,6 +15864,7 @@ word splitting on @samp{$@{1+"$@@"@}}; see @ref{Shell Substitutions},
 item @samp{$@@}, for more.
 
 
+@anchor{if}
 @item @command{if}
 @c ---------------
 @prindex @command{if}


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