Throw errors for nested targets in GN.

tools/gn/variables.cc

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "tools/gn/variables.h"
 
 namespace variables {
 
 // Built-in variables ----------------------------------------------------------
 
@@ skipping 749 matching lines @@
     "\n"
     "  A list of strings.\n"
     "\n"
     "  These flags are passed on the command-line to the linker and generally\n"
     "  specify various linking options. Most targets will not need these and\n"
     "  will use \"libs\" and \"lib_dirs\" instead.\n"
     "\n"
     "  ldflags are NOT pushed to dependents, so applying ldflags to source\n"
     "  sets or static libraries will be a no-op. If you want to apply ldflags\n"
     "  to dependent targets, put them in a config and set it in the\n"
-    "  all_dependent_configs or public_configs.\n";
+    "  all_dependent_configs or public_configs.\n"
+    COMMON_ORDERING_HELP;
 
 #define COMMON_LIB_INHERITANCE_HELP \
     "\n" \
     "  libs and lib_dirs work differently than other flags in two respects.\n" \
     "  First, then are inherited across static library boundaries until a\n" \
     "  shared library or executable target is reached. Second, they are\n" \
     "  uniquified so each one is only passed once (the first instance of it\n" \
     "  will be the one used).\n"
 
 const char kLibDirs[] = "lib_dirs";
@@ skipping 440 matching lines @@
     INSERT_VARIABLE(Sources)
     INSERT_VARIABLE(Testonly)
     INSERT_VARIABLE(Visibility)
   }
   return info_map;
 }
 
 #undef INSERT_VARIABLE
 
 }  // namespace variables