GN: Use implicit dependency for binary input deps

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 1030 matching lines @@
     "  listed in the inputs, the build will detect when it has changed in any\n"
     "  way and the action will re-run.\n"
     "\n"
     "Inputs for binary targets\n"
     "\n"
     "  Any input dependencies will be resolved before compiling any sources.\n"
     "  Normally, all actions that a target depends on will be run before any\n"
     "  files in a target are compiled. So if you depend on generated headers,\n"
     "  you do not typically need to list them in the inputs section.\n"
     "\n"
-    "  Inputs for binary targets will be treated as order-only dependencies,\n"
-    "  meaning that they will be forced up to date before compiling or\n"
-    "  any files in the target, but changes in the inputs will not\n"
-    "  necessarily force the target to compile. This is because it is\n"
-    "  expected that the compiler will report the precise list of input\n"
-    "  dependencies required to recompile each file once the initial build\n"
-    "  is done.\n"
+    "  Inputs for binary targets will be treated as implicit dependencies,\n"
+    "  meaning that changes in any of the inputs will force all sources in\n"
+    "  the target to be recompiled. If an input only applies to a subset of\n"
+    "  source files, you may want to split those into a separate target to\n"
+    "  avoid unnecessary recompiles.\n"
     "\n"
     "Example\n"
     "\n"
     "  action(\"myscript\") {\n"
     "    script = \"domything.py\"\n"
     "    inputs = [ \"input.data\" ]\n"
     "  }\n";
 
 const char kLdflags[] = "ldflags";
 const char kLdflags_HelpShort[] =
@@ skipping 712 matching lines @@
     INSERT_VARIABLE(Testonly)
     INSERT_VARIABLE(Visibility)
     INSERT_VARIABLE(WriteRuntimeDeps)
   }
   return info_map;
 }
 
 #undef INSERT_VARIABLE
 
 }  // namespace variables