X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Flink.m4;h=479083cb84bf48e2daa07201050ca183fa9d2b44;hb=665d45ce3389bc459031a378dca82c0ab055dd32;hp=349d5378f504cf35a3b28dbc3f2d717d5e78523a;hpb=d1ed8a817f5d07d4013cfa0988ee2da8b2937db6;p=gnulib.git

diff --git a/m4/link.m4 b/m4/link.m4
index 349d5378f..479083cb8 100644
--- a/m4/link.m4
+++ b/m4/link.m4
@@ -1,5 +1,5 @@
-# link.m4 serial 1
-dnl Copyright (C) 2009 Free Software Foundation, Inc.
+# link.m4 serial 5
+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.
@@ -11,9 +11,33 @@ AC_DEFUN([gl_FUNC_LINK],
   if test $ac_cv_func_link = no; then
     HAVE_LINK=0
     AC_LIBOBJ([link])
-    gl_PREREQ_LINK
+  else
+    AC_CACHE_CHECK([whether link handles trailing slash correctly],
+      [gl_cv_func_link_works],
+      [touch conftest.a
+       # Assume that if we have lstat, we can also check symlinks.
+       if test $ac_cv_func_lstat = yes; then
+         ln -s conftest.a conftest.lnk
+       fi
+       AC_RUN_IFELSE(
+         [AC_LANG_PROGRAM(
+           [[#include <unistd.h>
+           ]],
+           [[int result = 0;
+             if (!link ("conftest.a", "conftest.b/"))
+               result |= 1;
+#if HAVE_LSTAT
+             if (!link ("conftest.lnk/", "conftest.b"))
+               result |= 2;
+#endif
+             return result;
+           ]])],
+         [gl_cv_func_link_works=yes], [gl_cv_func_link_works=no],
+         [gl_cv_func_link_works="guessing no"])
+       rm -f conftest.a conftest.b conftest.lnk])
+    if test "$gl_cv_func_link_works" != yes; then
+      REPLACE_LINK=1
+      AC_LIBOBJ([link])
+    fi
   fi
 ])
-
-# Prerequisites of lib/link.c.
-AC_DEFUN([gl_PREREQ_LINK], [:])