X-Git-Url: https://erislabs.net/gitweb/?a=blobdiff_plain;ds=sidebyside;f=m4%2Fsymlink.m4;h=82ede2a4f7b67a429dd28f4d90631dc5702ee9bb;hb=8b40415718be86c3a37388ba35804be74b8f376e;hp=abea0459a09500e06a728be706bce7b5750e54e7;hpb=d9d5054ceb34c7e5b1dc64e5477ac6f89969a423;p=gnulib.git

diff --git a/m4/symlink.m4 b/m4/symlink.m4
index abea0459a..82ede2a4f 100644
--- a/m4/symlink.m4
+++ b/m4/symlink.m4
@@ -1,7 +1,7 @@
-# serial 1
+# serial 6
 # See if we need to provide symlink replacement.
 
-dnl Copyright (C) 2009 Free Software Foundation, Inc.
+dnl Copyright (C) 2009-2013 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.
@@ -11,25 +11,43 @@ dnl with or without modifications, as long as this notice is preserved.
 AC_DEFUN([gl_FUNC_SYMLINK],
 [
   AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
+  AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
   AC_CHECK_FUNCS_ONCE([symlink])
   dnl The best we can do on mingw is provide a dummy that always fails, so
-  dnl that compilation can proceed with fewer ifdefs.  On Solaris 9, we
-  dnl want to fix a bug with trailing slash handling.
+  dnl that compilation can proceed with fewer ifdefs.  On FreeBSD 7.2, AIX 7.1,
+  dnl and Solaris 9, we want to fix a bug with trailing slash handling.
   if test $ac_cv_func_symlink = no; then
     HAVE_SYMLINK=0
-    AC_LIBOBJ([symlink])
   else
     AC_CACHE_CHECK([whether symlink handles trailing slash correctly],
       [gl_cv_func_symlink_works],
       [AC_RUN_IFELSE(
          [AC_LANG_PROGRAM(
            [[#include <unistd.h>
-]], [[return !symlink ("a", "conftest.link/");]])],
+           ]],
+           [[int result = 0;
+             if (!symlink ("a", "conftest.link/"))
+               result |= 1;
+             if (symlink ("conftest.f", "conftest.lnk2"))
+               result |= 2;
+             else if (!symlink ("a", "conftest.lnk2/"))
+               result |= 4;
+             return result;
+           ]])],
          [gl_cv_func_symlink_works=yes], [gl_cv_func_symlink_works=no],
-         [gl_cv_func_symlink_works="guessing no"])])
-    if test "$gl_cv_func_symlink_works" != yes; then
-      REPLACE_SYMLINK=1
-      AC_LIBOBJ([symlink])
-    fi
+         [case "$host_os" in
+                    # Guess yes on glibc systems.
+            *-gnu*) gl_cv_func_symlink_works="guessing yes" ;;
+                    # If we don't know, assume the worst.
+            *)      gl_cv_func_symlink_works="guessing no" ;;
+          esac
+         ])
+      rm -f conftest.f conftest.link conftest.lnk2])
+    case "$gl_cv_func_symlink_works" in
+      *yes) ;;
+      *)
+        REPLACE_SYMLINK=1
+        ;;
+    esac
   fi
 ])