[GN]: Support for loadable modules

tools/gn/target.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/target.h"
 
 #include "base/bind.h"
 #include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
 #include "tools/gn/config_values_extractors.h"
@@ skipping 107 matching lines @@
 
 // static
 const char* Target::GetStringForOutputType(OutputType type) {
   switch (type) {
     case UNKNOWN:
       return "Unknown";
     case GROUP:
       return "Group";
     case EXECUTABLE:
       return "Executable";
+    case LOADABLE_MODULE:
+      return "Loadable module";
     case SHARED_LIBRARY:
       return "Shared library";
     case STATIC_LIBRARY:
       return "Static library";
     case SOURCE_SET:
       return "Source set";
     case COPY_FILES:
       return "Copy";
     case ACTION:
       return "Action";
@@ skipping 48 matching lines @@
   }
 
   return true;
 }
 
 bool Target::IsLinkable() const {
   return output_type_ == STATIC_LIBRARY || output_type_ == SHARED_LIBRARY;
 }
 
 bool Target::IsFinal() const {
-  return output_type_ == EXECUTABLE || output_type_ == SHARED_LIBRARY ||
+  return output_type_ == EXECUTABLE ||
+         output_type_ == SHARED_LIBRARY ||
+         output_type_ == LOADABLE_MODULE ||
          (output_type_ == STATIC_LIBRARY && complete_static_lib_);
 }
 
 DepsIteratorRange Target::GetDeps(DepsIterationType type) const {
   if (type == DEPS_LINKED) {
     return DepsIteratorRange(DepsIterator(
         &public_deps_, &private_deps_, nullptr));
   }
   // All deps.
   return DepsIteratorRange(DepsIterator(
@@ skipping 136 matching lines @@
     case ACTION_FOREACH: {
       // These don't get linked to and use stamps which should be the first
       // entry in the outputs. These stamps are named
       // "<target_out_dir>/<targetname>.stamp".
       dependency_output_file_ = GetTargetOutputDirAsOutputFile(this);
       dependency_output_file_.value().append(GetComputedOutputName(true));
       dependency_output_file_.value().append(".stamp");
       break;
     }
     case EXECUTABLE:
-      // Executables don't get linked to, but the first output is used for
-      // dependency management.
+    case LOADABLE_MODULE:
+      // Executables and loadable modules don't get linked to, but the first
+      // output is used for dependency management.
       CHECK_GE(tool->outputs().list().size(), 1u);
       check_tool_outputs = true;
       dependency_output_file_ =
           SubstitutionWriter::ApplyPatternToLinkerAsOutputFile(
               this, tool, tool->outputs().list()[0]);
       break;
     case STATIC_LIBRARY:
       // Static libraries both have dependencies and linking going off of the
       // first output.
       CHECK(tool->outputs().list().size() >= 1);
@@ skipping 172 matching lines @@
     return;  // Not in output dir, this is OK.
 
   // Tell the scheduler about unknown files. This will be noted for later so
   // the list of files written by the GN build itself (often response files)
   // can be filtered out of this list.
   OutputFile out_file(settings()->build_settings(), source);
   std::set<const Target*> seen_targets;
   if (!EnsureFileIsGeneratedByDependency(this, out_file, true, &seen_targets))
     g_scheduler->AddUnknownGeneratedInput(this, source);
 }