Backport: d: Insert null terminator in obstack buffers
b2abe4e1aded1409964b870899d18dfdb6384821

Index: gcc/d/d-lang.cc
--- gcc/d/d-lang.cc.orig
+++ gcc/d/d-lang.cc
@@ -108,7 +108,7 @@ deps_add_target (const char *target, bool quoted)
 
   if (!quoted)
     {
-      obstack_grow (&buffer, target, strlen (target));
+      obstack_grow0 (&buffer, target, strlen (target));
       d_option.deps_target.safe_push ((const char *) obstack_finish (&buffer));
       return;
     }
@@ -149,6 +149,7 @@ deps_add_target (const char *target, bool quoted)
       obstack_1grow (&buffer, *p);
     }
 
+  obstack_1grow (&buffer, '\0');
   d_option.deps_target.safe_push ((const char *) obstack_finish (&buffer));
 }
 
@@ -278,6 +279,8 @@ deps_write (Module *module, obstack *buffer)
       obstack_grow (buffer, str, strlen (str));
       obstack_grow (buffer, ":\n", 2);
     }
+
+  obstack_1grow (buffer, '\0');
 }
 
 /* Implements the lang_hooks.init_options routine for language D.
@@ -884,6 +887,7 @@ d_parse_file (void)
 	      obstack_grow (&buffer, str, strlen (str));
 	    }
 
+	  obstack_1grow (&buffer, '\0');
 	  message ("%s", (char *) obstack_finish (&buffer));
 	}
     }
@@ -1727,6 +1731,12 @@ d_enum_underlying_base_type (const_tree type)
 {
   gcc_assert (TREE_CODE (type) == ENUMERAL_TYPE);
   return TREE_TYPE (type);
+}
+
+const char *
+fname_as_string(int pretty_p __attribute__((__unused__)))
+{
+	return NULL;
 }
 
 /* Definitions for our language-specific hooks.  */
