[SCM] GNU Autoconf source repository branch, master, updated. v2.63-241-g96ab16b

[Eric Blake]

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- Log -----------------------------------------------------------------
commit 96ab16be4a15f75fad0b28dd40a49ddcb201188f
Author: Eric Blake <address@hidden>
Date:   Thu Dec 18 06:44:59 2008 -0700

    Document m4_version_prereq.
    
    * doc/autoconf.texi (Number processing Macros)
    <m4_version_prereq>: Add documentation.
    * NEWS: Mention it.
    Reported by Bruno Haible.
    
    Signed-off-by: Eric Blake <address@hidden>

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

Summary of changes:
 ChangeLog         |    8 ++++++++
 NEWS              |    2 +-
 doc/autoconf.texi |   12 ++++++++++++
 3 files changed, 21 insertions(+), 1 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 704ec47..86c6c4b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,11 @@
+2008-12-18  Eric Blake  <address@hidden>
+
+       Document m4_version_prereq.
+       * doc/autoconf.texi (Number processing Macros)
+       <m4_version_prereq>: Add documentation.
+       * NEWS: Mention it.
+       Reported by Bruno Haible.
+
 2008-12-10  Jim Meyering  <address@hidden>
 
        AC_HEADER_ASSERT: don't say assertions are disabled when they're not
diff --git a/NEWS b/NEWS
index 65e5486..2e7fa1e 100644
--- a/NEWS
+++ b/NEWS
@@ -30,7 +30,7 @@ GNU Autoconf NEWS - User visible changes.
    m4_map_args_pair  m4_set_map
 
 ** The following m4sugar macros are documented now:
-   m4_copy  m4_dumpdefs  m4_rename
+   m4_copy  m4_dumpdefs  m4_rename  m4_version_prereq
 
 ** The m4sugar macro m4_expand has been taught to handle unterminated
    comments and shell case statements.  As a result, it is used
diff --git a/doc/autoconf.texi b/doc/autoconf.texi
index d232e4e..aeeb388 100644
--- a/doc/autoconf.texi
+++ b/doc/autoconf.texi
@@ -11835,6 +11835,18 @@ m4_version_compare([2.61b], [2.61a-248-dc51])
 @end example
 @end defmac
 
address@hidden m4_version_prereq (@var{version}, @ovar{if-new-enough}, @
+  @dvar{if-old, m4_fatal})
address@hidden
+Compares @var{version} against the version of Autoconf currently
+running.  If the running version is at @var{version} or newer, expand
address@hidden, but if @var{version} is larger than the version
+currently executing, expand @var{if-old}, which defaults to printing an
+error message and exiting m4sugar with status 63.  When given only one
+argument, this behaves like @code{AC_PREREQ} (@pxref{Versioning}).
+Remember that the autoconf philosophy favors feature checks over version
+checks.
address@hidden defmac
 
 @node Set manipulation Macros
 @subsection Set manipulation in M4


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