prepare NEWS.stable

[gnulib.git] / m4 / link.m4

diff --git a/m4/link.m4 b/m4/link.m4
index a212ee2..ed8427a 100644 (file)
--- a/m4/link.m4
+++ b/m4/link.m4
@@ -1,5 +1,5 @@
-# link.m4 serial 3
-dnl Copyright (C) 2009 Free Software Foundation, Inc.
+# link.m4 serial 7
+dnl Copyright (C) 2009-2011 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.
@@ -10,21 +10,36 @@ AC_DEFUN([gl_FUNC_LINK],
   AC_CHECK_FUNCS_ONCE([link])
   if test $ac_cv_func_link = no; then
     HAVE_LINK=0
-    AC_LIBOBJ([link])
   else
-    AC_CACHE_CHECK([whether link handles trailing slash correctly],
+    AC_CACHE_CHECK([whether link obeys POSIX],
       [gl_cv_func_link_works],
       [touch conftest.a
+       # Assume that if we have lstat, we can also check symlinks.
+       if test $ac_cv_func_lstat = yes; then
+         ln -s conftest.a conftest.lnk
+       fi
        AC_RUN_IFELSE(
          [AC_LANG_PROGRAM(
            [[#include <unistd.h>
-]], [[return !link ("conftest.a", "conftest.b/");]])],
+           ]],
+           [[int result = 0;
+             if (!link ("conftest.a", "conftest.b/"))
+               result |= 1;
+#if HAVE_LSTAT
+             if (!link ("conftest.lnk/", "conftest.b"))
+               result |= 2;
+             if (rename ("conftest.a", "conftest.b"))
+               result |= 4;
+             if (!link ("conftest.b", "conftest.lnk"))
+               result |= 8;
+#endif
+             return result;
+           ]])],
          [gl_cv_func_link_works=yes], [gl_cv_func_link_works=no],
          [gl_cv_func_link_works="guessing no"])
-       rm -f conftest.a conftest.b])
+       rm -f conftest.a conftest.b conftest.lnk])
     if test "$gl_cv_func_link_works" != yes; then
       REPLACE_LINK=1
-      AC_LIBOBJ([link])
     fi
   fi
 ])