[SCM] GNU Autoconf source repository branch, master, updated. v2.63-21-gd88e6dc

[Ralf Wildenhues]

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- Log -----------------------------------------------------------------
commit d88e6dc09ec0f9c019949c78de47ec1cbb9aebf3
Author: Ralf Wildenhues <address@hidden>
Date:   Wed Oct 8 07:38:54 2008 +0200

    Document AS_VERSION_COMPARE.
    
    * doc/autoconf.texi (Programming in M4sh): Document
    AS_VERSION_COMPARE.
    * NEWS: Update.
    
    Signed-off-by: Ralf Wildenhues <address@hidden>

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

Summary of changes:
 ChangeLog         |    5 +++++
 NEWS              |    3 +++
 doc/autoconf.texi |   12 ++++++++++++
 3 files changed, 20 insertions(+), 0 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 97f0754..07e741d 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,10 @@
 2008-10-08  Ralf Wildenhues  <address@hidden>
 
+       Document AS_VERSION_COMPARE.
+       * doc/autoconf.texi (Programming in M4sh): Document
+       AS_VERSION_COMPARE.
+       * NEWS: Update.
+
        Do not write to testsuite log fd before initialization.
        * lib/autotest/general.m4 (AS_MESSAGE_LOG_FD, AT_JOB_FIFO_FD):
        Define fds only when initializing the log fd so early error
diff --git a/NEWS b/NEWS
index b1de684..ac822d5 100644
--- a/NEWS
+++ b/NEWS
@@ -13,6 +13,9 @@ GNU Autoconf NEWS - User visible changes.
 ** The following m4sugar macros are new:
    m4_default_quoted
 
+** The following m4sh macros are documented now:
+   AS_VERSION_COMPARE.
+
 
 * Major changes in Autoconf 2.63 (2008-09-09) [stable]
   Released by Eric Blake, based on git versions 2.62.*.
diff --git a/doc/autoconf.texi b/doc/autoconf.texi
index f258666..5753d37 100644
--- a/doc/autoconf.texi
+++ b/doc/autoconf.texi
@@ -11924,6 +11924,18 @@ optimizing the common cases (@var{dir} or @var{file} 
is @samp{.},
 @var{file} is absolute, etc.).
 @end defmac
 
address@hidden AS_VERSION_COMPARE (@var{version-1}, @var{version-2}, @
+  @ovar{action-if-less}, @ovar{action-if-equal}, @ovar{action-if-greater})
address@hidden
+Compare two strings @var{version-1} and @var{version-2}, possibly
+containing shell variables, as version strings, and expand
address@hidden, @var{action-if-equal}, or @var{action-if-greater}
+depending upon the result.
+The algorithm to compare is similar to the one used by strverscmp in
+glibc (@pxref{String/Array Comparison, , String/Array Comparison, libc,
+The @acronym{GNU} C Library}).
address@hidden defmac
+
 
 @node File Descriptor Macros
 @section File Descriptor Macros


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