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

[Ralf Wildenhues]

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- Log -----------------------------------------------------------------
commit 9c16f1a80d38800d400403a78f322b74c09c827d
Author: Ralf Wildenhues <address@hidden>
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 <address@hidden>

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

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  <address@hidden>
 
+       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               address@hidden
 Dave Adams                  address@hidden
 Dave Erickson               address@hidden
+Dave Korn                   address@hidden
 Dave Love                   address@hidden
 David Byron                 address@hidden
 David Carter                address@hidden
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
address@hidden rejects @samp{s/[^/]*$//}: use @samp{s,[^/]*$,,}.
address@hidden 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
address@hidden,address@hidden,address@hidden,,}, 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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