[SCM] GNU Autoconf source repository branch, master, updated. v2.63-68-gaf61bad

[Eric Blake]

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- Log -----------------------------------------------------------------
commit af61badc821bcef780650da9032adbc4d86d1db5
Author: Eric Blake <address@hidden>
Date:   Sat Oct 18 07:27:45 2008 -0600

    Document bugs in { } handling.
    
    * doc/autoconf.texi (Limitations of Builtins): Mention bug on
    empty list.
    
    Signed-off-by: Eric Blake <address@hidden>

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

Summary of changes:
 ChangeLog         |    4 ++++
 doc/autoconf.texi |   16 ++++++++++++++++
 2 files changed, 20 insertions(+), 0 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index d971b18..25c8826 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,9 @@
 2008-10-18  Eric Blake  <address@hidden>
 
+       Document bugs in { } handling.
+       * doc/autoconf.texi (Limitations of Builtins): Mention bug on
+       empty list.
+
        Fix some testsuite failures introduced two days ago.
        * tests/m4sh.at (Nested AS@&address@hidden)
        (AS@&address@hidden and m4@&address@hidden): Adjust to changed
diff --git a/doc/autoconf.texi b/doc/autoconf.texi
index a6bcb34..eed40c5 100644
--- a/doc/autoconf.texi
+++ b/doc/autoconf.texi
@@ -14624,6 +14624,22 @@ bash: line 1: /bad: Permission denied
 1
 @end example
 
+Posix requires a syntax error if a brace list has no contents.  However,
+not all shells obey this rule; and on shells where empty lists are
+permitted, the effect on @samp{$?} is inconsistent.  To avoid problems,
+ensure that a brace list is never empty.
+
address@hidden
+$ @kbd{bash -c 'false; @{ @}; echo $?' || echo $?}
+bash: line 1: syntax error near unexpected token address@hidden'
+bash: line 1: `false; @{ @}; echo $?'
+2
+$ @kbd{zsh -c 'false; @{ @}; echo $?' || echo $?}
+1
+$ @kbd{pdksh -c 'false; @{ @}; echo $?' || echo $?}
+0
address@hidden example
+
 
 @item @command{break}
 @c ------------------


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