Preserve timestamp of symlinks when extracting (if utimensat available)

[tar] / m4 / rpmatch.m4

diff --git a/m4/rpmatch.m4 b/m4/rpmatch.m4
index 4a471ac860828c1176dba68d27496d28702e01ec..387deffbf82559b658b820eced3dc459fcb84fa8 100644 (file)
--- a/m4/rpmatch.m4
+++ b/m4/rpmatch.m4
@@ -1,16 +1,32 @@
-# rpmatch.m4 serial 5
-dnl Copyright (C) 2002, 2003 Free Software Foundation, Inc.
+# rpmatch.m4 serial 8
+dnl Copyright (C) 2002-2003, 2007-2009 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
 
 AC_DEFUN([gl_FUNC_RPMATCH],
 [
-  AC_REPLACE_FUNCS(rpmatch)
+  dnl Persuade glibc <stdlib.h> to declare rpmatch().
+  AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
+
+  AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
+  AC_REPLACE_FUNCS([rpmatch])
   if test $ac_cv_func_rpmatch = no; then
+    HAVE_RPMATCH=0
     gl_PREREQ_RPMATCH
   fi
 ])
 
 # Prerequisites of lib/rpmatch.c.
-AC_DEFUN([gl_PREREQ_RPMATCH], [:])
+AC_DEFUN([gl_PREREQ_RPMATCH], [
+  AC_CACHE_CHECK([for nl_langinfo and YESEXPR], [gl_cv_langinfo_yesexpr],
+    [AC_TRY_LINK([#include <langinfo.h>],
+       [char* cs = nl_langinfo(YESEXPR); return !cs;],
+       [gl_cv_langinfo_yesexpr=yes],
+       [gl_cv_langinfo_yesexpr=no])
+    ])
+  if test $gl_cv_langinfo_yesexpr = yes; then
+    AC_DEFINE([HAVE_LANGINFO_YESEXPR], [1],
+      [Define if you have <langinfo.h> and nl_langinfo(YESEXPR).])
+  fi
+])