Windows precompiled header support in GN

tools/gn/target.h

 // 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.
 
 #ifndef TOOLS_GN_TARGET_H_
 #define TOOLS_GN_TARGET_H_
 
 #include <set>
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
+#include "base/gtest_prod_util.h"
 #include "base/logging.h"
 #include "base/strings/string_piece.h"
 #include "base/synchronization/lock.h"
 #include "tools/gn/action_values.h"
 #include "tools/gn/config_values.h"
 #include "tools/gn/inherited_libraries.h"
 #include "tools/gn/item.h"
 #include "tools/gn/label_ptr.h"
 #include "tools/gn/ordered_set.h"
 #include "tools/gn/output_file.h"
@@ skipping 222 matching lines @@
   // that. This is a cache of the files to prevent every target that depends on
   // a given library from recomputing the same pattern.
   const OutputFile& link_output_file() const {
     return link_output_file_;
   }
   const OutputFile& dependency_output_file() const {
     return dependency_output_file_;
   }
 
  private:
+  FRIEND_TEST_ALL_PREFIXES(Target, ResolvePrecompiledHeaders);
+
   // Pulls necessary information from dependencies to this one when all
   // dependencies have been resolved.
   void PullDependentTarget(const Target* dep, bool is_public);
   void PullDependentTargets();
 
   // These each pull specific things from dependencies to this one when all
   // deps have been resolved.
   void PullForwardedDependentConfigs();
   void PullForwardedDependentConfigsFrom(const Target* from);
   void PullRecursiveHardDeps();
 
   // Fills the link and dependency output files when a target is resolved.
   void FillOutputFiles();
 
+  // Checks precompiled headers from configs and makes sure the resulting
+  // values are in config_values_.
+  bool ResolvePrecompiledHeaders(Err* err);
+
   // Validates the given thing when a target is resolved.
   bool CheckVisibility(Err* err) const;
   bool CheckTestonly(Err* err) const;
   bool CheckNoNestedStaticLibs(Err* err) const;
   void CheckSourcesGenerated() const;
   void CheckSourceGenerated(const SourceFile& source) const;
 
   OutputType output_type_;
   std::string output_name_;
   std::string output_extension_;
@@ skipping 24 matching lines @@
 
   // These libs and dirs are inherited from statically linked deps and all
   // configs applying to this target.
   OrderedSet<SourceDir> all_lib_dirs_;
   OrderedSet<std::string> all_libs_;
 
   // All hard deps from this target and all dependencies. Filled in when this
   // target is marked resolved. This will not include the current target.
   std::set<const Target*> recursive_hard_deps_;
 
-  ConfigValues config_values_;  // Used for all binary targets.
-  ActionValues action_values_;  // Used for action[_foreach] targets.
+  // Used for all binary targets. The precompiled header values in this struct
+  // will be resolved to the ones to use for this target, if precompiled
+  // headers are used.
+  ConfigValues config_values_;
+
+  // Used for action[_foreach] targets.
+  ActionValues action_values_;
 
   // Toolchain used by this target. Null until target is resolved.
   const Toolchain* toolchain_;
 
   // Output files. Empty until the target is resolved.
   std::vector<OutputFile> computed_outputs_;
   OutputFile link_output_file_;
   OutputFile dependency_output_file_;
 
   DISALLOW_COPY_AND_ASSIGN(Target);
 };
 
 #endif  // TOOLS_GN_TARGET_H_