[SCM] GNU Autoconf source repository branch, master, updated. v2.63-293-gabee382

[Eric Blake]

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- Log -----------------------------------------------------------------
commit abee382683d1b977f2ab4a91121b4277045e6d5a
Author: Eric Blake <address@hidden>
Date:   Tue Mar 17 19:33:08 2009 -0600

    Manual: mention more expr pitfalls.
    
    * doc/autoconf.texi (Limitations of Usual Tools) <expr (:)>:
    Mention HP-UX limitation, and $ ambiguity.
    * THANKS: Update.
    Reported by Jens Schmidt, in http://bugs.debian.org/466990.
    
    Signed-off-by: Eric Blake <address@hidden>

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

Summary of changes:
 ChangeLog         |    8 ++++++++
 THANKS            |    1 +
 doc/autoconf.texi |   23 +++++++++++++++++++++++
 3 files changed, 32 insertions(+), 0 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 259004e..3829924 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,11 @@
+2009-03-18  Eric Blake  <address@hidden>
+
+       Manual: mention more expr pitfalls.
+       * doc/autoconf.texi (Limitations of Usual Tools) <expr (:)>:
+       Mention HP-UX limitation, and $ ambiguity.
+       * THANKS: Update.
+       Reported by Jens Schmidt, in http://bugs.debian.org/466990.
+
 2009-03-17  Jim Meyering  <address@hidden>
 
        Manual: fix a typo.
diff --git a/THANKS b/THANKS
index c3e19a2..8d8bb37 100644
--- a/THANKS
+++ b/THANKS
@@ -164,6 +164,7 @@ Jeffrey A Law               address@hidden
 Jeffrey J. Barteet          ?
 Jennis Pruett               ?
 Jens Petersen               address@hidden
+Jens Schmidt                address@hidden
 Jeremy Yallop               address@hidden
 Jerker Bäck                 address@hidden
 Jim Blandy                  address@hidden
diff --git a/doc/autoconf.texi b/doc/autoconf.texi
index a0a19b8..a4cb0d1 100644
--- a/doc/autoconf.texi
+++ b/doc/autoconf.texi
@@ -16642,6 +16642,21 @@ Portable @command{expr} regular expressions should not 
begin with
 @samp{^}.  Patterns are automatically anchored so leading @samp{^} is
 not needed anyway.
 
+On the other hand, the behavior of the @samp{$} anchor is not portable
+on multi-line strings.  Posix is ambiguous whether the anchor applies to
+each line, as was done in older versions of @acronym{GNU} Coreutils, or
+whether it applies only to the end of the overall string, as in
+Coreutils 6.0 and most other implementations.
+
address@hidden
+$ @kbd{baz='foo}
+> @kbd{bar'}
+$ @kbd{expr "X$baz" : 'X\(foo\)$'}
+
+$ @kbd{expr-5.97 "X$baz" : 'X\(foo\)$'}
+foo
address@hidden example
+
 The Posix standard is ambiguous as to whether
 @samp{expr 'a' : '\(b\)'} outputs @samp{0} or the empty string.
 In practice, it outputs the empty string on most platforms, but portable
@@ -16718,6 +16733,14 @@ $ @kbd{expr 00001 : '.*\(...\)'}
 1
 @end example
 
+On @acronym{HP-UX} 11, @command{expr} only supports a single
+sub-expression.
+
address@hidden
+$ @kbd{expr 'Xfoo' : 'X\(f\(oo\)*\)$'}
+expr: More than one '\(' was used.
address@hidden example
+
 
 @item @command{fgrep}
 @c ------------------


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