[SCM] GNU Autoconf source repository branch, master, updated. v2.68-68-g2105ae9

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- Log -----------------------------------------------------------------
commit 2105ae97000c7c77442b3a788c90d8fee63bd2b3
Author: Eric Blake <[email protected]>
Date:   Thu May 5 08:29:21 2011 -0600

    doc: document dash bug with positional parameters
    
    * doc/autoconf.texi (Shell Substitutions) <${10}>: Document
    a pitfall with $10.
    
    Signed-off-by: Eric Blake <[email protected]>

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

Summary of changes:
 ChangeLog         |    6 ++++++
 doc/autoconf.texi |   12 ++++++++++++
 2 files changed, 18 insertions(+), 0 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 14abf51..1fca7bb 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2011-05-05  Eric Blake  <[email protected]>
+
+	doc: document dash bug with positional parameters
+	* doc/autoconf.texi (Shell Substitutions) <${10}>: Document
+	a pitfall with $10.
+
 2011-04-27  Eric Blake  <[email protected]>
 
 	docs: document NetBSD join bug
diff --git a/doc/autoconf.texi b/doc/autoconf.texi
index b466e56..7ff693f 100644
--- a/doc/autoconf.texi
+++ b/doc/autoconf.texi
@@ -15846,6 +15846,18 @@ $ @kbd{echo $@{10@}}
 bad substitution
 @end example
 
+Conversely, not all shells obey the Posix rule that when braces are
+omitted, multiple digits beyond a @samp{$} imply the single-digit
+positional parameter expansion concatenated with the remaining literal
+digits.  To work around the issue, you must use braces.
+
+@example
+$ @kbd{bash -c 'set a b c d e f g h i j; echo $10 $@{1@}0'}
+a0 a0
+$ @kbd{dash -c 'set a b c d e f g h i j; echo $10 $@{1@}0'}
+j a0
+@end example
+
 @item $@{@var{var}:-@var{value}@}
 @c Info cannot handle `:' in index entries.
 @ifnotinfo


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