[SCM] GNU Autoconf source repository branch, master, updated. v2.64-30-g9c16f1a

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- Log -----------------------------------------------------------------
commit 9c16f1a80d38800d400403a78f322b74c09c827d
Author: Ralf Wildenhues <[email protected]>
Date:   Thu Sep 10 06:56:45 2009 +0200

    Document sed limitation with escaped metacharacters.
    
    * doc/autoconf.texi (Limitations of Usual Tools) <sed>: Use `%'
    rather than `/' as delimiter in an example `s' command.
    Document inconsistent treatment of escaped metacharacters.
    * THANKS: Update.
    Report by Dave Korn, with additional input from Paolo Bonzini
    and Eric Blake.
    
    Signed-off-by: Ralf Wildenhues <[email protected]>

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

Summary of changes:
 ChangeLog         |    8 ++++++++
 THANKS            |    1 +
 doc/autoconf.texi |    6 +++++-
 3 files changed, 14 insertions(+), 1 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 9079a0e..80f5609 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,13 @@
 2009-09-10  Ralf Wildenhues  <[email protected]>
 
+	Document sed limitation with escaped metacharacters.
+	* doc/autoconf.texi (Limitations of Usual Tools) <sed>: Use `%'
+	rather than `/' as delimiter in an example `s' command.
+	Document inconsistent treatment of escaped metacharacters.
+	* THANKS: Update.
+	Report by Dave Korn, with additional input from Paolo Bonzini
+	and Eric Blake.
+
 	Document temporary directory `$tmp' for use in config.status.
 	* doc/autoconf.texi (Configuration Actions): Document `$tmp'.
 	* NEWS: Update.
diff --git a/THANKS b/THANKS
index 460e680..0901d6a 100644
--- a/THANKS
+++ b/THANKS
@@ -86,6 +86,7 @@ Daniel Reed                 ?
 Daniele Arena               [email protected]
 Dave Adams                  [email protected]
 Dave Erickson               [email protected]
+Dave Korn                   [email protected]
 Dave Love                   [email protected]
 David Byron                 [email protected]
 David Carter                [email protected]
diff --git a/doc/autoconf.texi b/doc/autoconf.texi
index 320ef23..82a9f2a 100644
--- a/doc/autoconf.texi
+++ b/doc/autoconf.texi
@@ -17511,7 +17511,11 @@ directory.
 @prindex @command{sed}
 Patterns should not include the separator (unless escaped), even as part
 of a character class.  In conformance with Posix, the Cray
-@command{sed} rejects @samp{s/[^/]*$//}: use @samp{s,[^/]*$,,}.
+@command{sed} rejects @samp{s/[^/]*$//}: use @samp{s%[^/]*$%%}.
+Even when escaped, patterns should not include separators that are also
+used as @command{sed} metacharacters.  For example, GNU sed 4.0.9 rejects
+@samp{s,x\@{1\,\@},,}, while sed 4.1 strips the backslash before the comma
+before evaluating the basic regular expression.
 
 Avoid empty patterns within parentheses (i.e., @samp{\(\)}).  Posix does
 not require support for empty patterns, and Unicos 9 @command{sed} rejects


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