X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Futime.m4;h=f090e7b048479fbeb5b20d07743faa477e03ee45;hb=4097b52187106b6a2940d28968cfecd4e53f9b4e;hp=6762a50db8dae17a93c09f6a2d865cc3999614ac;hpb=23fe10e274cf20fb2cb75ea1da9556a733106657;p=gnulib.git

diff --git a/m4/utime.m4 b/m4/utime.m4
index 6762a50db..f090e7b04 100644
--- a/m4/utime.m4
+++ b/m4/utime.m4
@@ -1,16 +1,21 @@
-#serial 6
+# serial 9
 
 dnl From Jim Meyering
 dnl Replace the utime function on systems that need it.
 
+# Copyright (C) 1998, 2000-2001, 2003-2004, 2009 Free Software Foundation, Inc.
+# This file is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
 dnl FIXME
 
 AC_DEFUN([gl_FUNC_UTIME],
 [
   AC_REQUIRE([AC_FUNC_UTIME_NULL])
   if test $ac_cv_func_utime_null = no; then
-    AC_LIBOBJ(utime)
-    AC_DEFINE(utime, rpl_utime,
+    AC_LIBOBJ([utime])
+    AC_DEFINE([utime], [rpl_utime],
       [Define to rpl_utime if the replacement function should be used.])
     gl_PREREQ_UTIME
   fi
@@ -19,7 +24,38 @@ AC_DEFUN([gl_FUNC_UTIME],
 # Prerequisites of lib/utime.c.
 AC_DEFUN([gl_PREREQ_UTIME],
 [
-  AC_CHECK_HEADERS_ONCE(utime.h)
+  AC_CHECK_HEADERS_ONCE([utime.h])
   AC_REQUIRE([gl_CHECK_TYPE_STRUCT_UTIMBUF])
   gl_FUNC_UTIMES_NULL
 ])
+
+# Use the definition of AC_FUNC_UTIME_NULL from autoconf 2.64 or newer.
+# Remove this macro when we can assume autoconf >= 2.64.
+m4_version_prereq([2.64], [], [
+AC_DEFUN([AC_FUNC_UTIME_NULL],
+[AC_CHECK_HEADERS_ONCE([utime.h])
+AC_CACHE_CHECK([whether utime accepts a null argument], [ac_cv_func_utime_null],
+[rm -f conftest.data; >conftest.data
+# Sequent interprets utime(file, 0) to mean use start of epoch.  Wrong.
+AC_RUN_IFELSE([AC_LANG_PROGRAM([AC_INCLUDES_DEFAULT
+	       #ifdef HAVE_UTIME_H
+	       # include <utime.h>
+	       #endif],
+[[struct stat s, t;
+  return ! (stat ("conftest.data", &s) == 0
+	    && utime ("conftest.data", 0) == 0
+	    && stat ("conftest.data", &t) == 0
+	    && t.st_mtime >= s.st_mtime
+	    && t.st_mtime - s.st_mtime < 120);]])],
+	      ac_cv_func_utime_null=yes,
+	      ac_cv_func_utime_null=no,
+	      ac_cv_func_utime_null='guessing yes')])
+if test "x$ac_cv_func_utime_null" != xno; then
+  ac_cv_func_utime_null=yes
+  AC_DEFINE([HAVE_UTIME_NULL], [1],
+	    [Define to 1 if `utime(file, NULL)' sets file's timestamp to the
+	     present.])
+fi
+rm -f conftest.data
+])
+])