[SCM] GNU Autoconf source repository branch, master, updated. v2.61a-406-g5c55fb1

[Eric Blake]

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- Log -----------------------------------------------------------------
commit 5c55fb1f4db4ce31263d71744014eddde28071fd
Author: Eric Blake <address@hidden>
Date:   Tue Mar 25 21:19:58 2008 -0600

    Document busybox sed bug.
    
    * doc/autoconf.texi (Limitations of Usual Tools): Mention
    restrictions when using back-references.
    Reported by Vincent Lefevre:
    <http://thread.gmane.org/gmane.comp.gnu.coreutils.bugs/13013>.
    
    Signed-off-by: Eric Blake <address@hidden>

commit 7b93a8c8f6fefab11192f4433d8c10db4e0cf9c8
Author: Eric Blake <address@hidden>
Date:   Tue Mar 25 20:50:05 2008 -0600

    Document Automake interaction with AC_CONFIG_MACRO_DIR.
    
    * doc/autoconf.texi (Input): Mention ACLOCAL_AMFLAGS for automake
    users.
    * THANKS: Update.
    Reported by Chris Pickett.
    
    Signed-off-by: Eric Blake <address@hidden>

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

Summary of changes:
 ChangeLog         |   14 ++++++++++++++
 THANKS            |    1 +
 doc/autoconf.texi |   21 +++++++++++++++++++++
 3 files changed, 36 insertions(+), 0 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 4ec5b15..7f82ee2 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,17 @@
+2008-03-26  Eric Blake  <address@hidden>
+
+       Document busybox sed bug.
+       * doc/autoconf.texi (Limitations of Usual Tools): Mention
+       restrictions when using back-references.
+       Reported by Vincent Lefevre:
+       <http://thread.gmane.org/gmane.comp.gnu.coreutils.bugs/13013>.
+
+       Document Automake interaction with AC_CONFIG_MACRO_DIR.
+       * doc/autoconf.texi (Input): Mention ACLOCAL_AMFLAGS for automake
+       users.
+       * THANKS: Update.
+       Reported by Chris Pickett.
+
 2008-03-25  Ralf Wildenhues  <address@hidden>
 
        * tests/autotest.at (Using atlocal): Quote instances of `pwd`.
diff --git a/THANKS b/THANKS
index 1227291..c6b5f4c 100644
--- a/THANKS
+++ b/THANKS
@@ -58,6 +58,7 @@ Carlos Velasco              address@hidden
 Chad R. Larson              address@hidden
 Charles 'Buck' Krasic       address@hidden
 Chris P. Ross               address@hidden
+Chris Pickett               address@hidden
 Chris Provenzano            address@hidden
 Chris Torek                 address@hidden
 Christian Cornelssen        address@hidden
diff --git a/doc/autoconf.texi b/doc/autoconf.texi
index a32e779..b72d875 100644
--- a/doc/autoconf.texi
+++ b/doc/autoconf.texi
@@ -1971,6 +1971,13 @@ This macro is intended for use by future versions of 
commands like
 @command{autoreconf} that trace macro calls.  It should be called
 directly from @file{configure.ac} so that tools that install macros for
 @command{aclocal} can find the macros' declarations.
+
+Note that if you use @command{aclocal} from Automake to generate
address@hidden, you must also set @code{ACLOCAL_AMFLAGS = -I
address@hidden in your top-level @file{Makefile.am}.  Due to a limitation in
+the Autoconf implementation of @command{autoreconf}, these include
+directives currently must be set on a single line in @file{Makefile.am},
+without any backslash-newlines.
 @end defmac
 
 
@@ -15382,6 +15389,20 @@ flushleft
    indented
 @end example
 
+Posix requires that with an empty regular expression, the last non-empty
+regular expression from either an address specification or substitution
+command is applied.  However, busybox 1.6.1 complains when using a
+substitution command with a replacement containing a back-reference to
+an empty regular expression; the workaround is repeating the regular
+expression.
+
address@hidden
address@hidden {echo abc | busybox sed '/a\(b\)c/ s//\1/'}
+sed: No previous regexp.
address@hidden {echo abc | busybox sed '/a\(b\)c/ s/a\(b\)c/\1/'}
+b
address@hidden example
+
 
 @item @command{sed} (@samp{t})
 @c ---------------------------


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