From 2869c0a819b571124f4967991839359b697802b6 Mon Sep 17 00:00:00 2001
From: "joi@chromium.org"
 <joi@chromium.org@4ff67af0-8c30-449e-8e8b-ad334ec8d88c>
Date: Wed, 7 Sep 2011 14:14:54 +0000
Subject: [PATCH] Use precompiled headers for most large projects where the
 .gyp file is not a third party file.

On my machine, this speeds up a full recompile of the 'chrome' target
in Debug mode by about 18%.

BUG=none
TEST=it builds, existing tests pass

Review URL: http://codereview.chromium.org/7706011

git-svn-id: http://src.chromium.org/svn/trunk/src/build@99949 4ff67af0-8c30-449e-8e8b-ad334ec8d88c
---
 precompile.cc       |   7 ++++
 precompile.h        | 100 ++++++++++++++++++++++++++++++++++++++++++++
 win_precompile.gypi |  20 +++++++++
 3 files changed, 127 insertions(+)
 create mode 100644 precompile.cc
 create mode 100644 precompile.h
 create mode 100644 win_precompile.gypi

diff --git a/precompile.cc b/precompile.cc
new file mode 100644
index 000000000..db1ef6dfe
--- /dev/null
+++ b/precompile.cc
@@ -0,0 +1,7 @@
+// Copyright (c) 2011 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.
+
+// Precompiled header generator for Windows builds. No include is needed
+// in this file as the PCH include is forced via the "Forced Include File"
+// flag in the projects generated by GYP.
diff --git a/precompile.h b/precompile.h
new file mode 100644
index 000000000..940d7302b
--- /dev/null
+++ b/precompile.h
@@ -0,0 +1,100 @@
+// Copyright (c) 2011 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.
+
+// Precompiled header for Chromium project on Windows, not used by
+// other build configurations. Using precompiled headers speeds the
+// build up significantly, around 1/4th on VS 2010 on an HP Z600 with 12
+// GB of memory.
+//
+// Numeric comments beside includes are the number of times they were
+// included under src/chrome/browser on 2011/8/20, which was used as a
+// baseline for deciding what to include in the PCH. It may be
+// possible to tweak the speed of the build by commenting out or
+// removing some of the less frequently used headers.
+
+#if defined(BUILD_PRECOMPILE_H_)
+#error You shouldn't include the precompiled header file more than once.
+#endif
+
+#define BUILD_PRECOMPILE_H_
+
+// The Windows header needs to come before almost all the other
+// Windows-specific headers.
+#include <Windows.h>
+
+// TODO(joi): Defines in atlbase.h cause conflicts; need to figure out
+// if/how this family of headers can be included in the PCH; several
+// of them are used quite frequently.
+/*
+#include <atlbase.h>
+#include <atlapp.h>
+#include <atlcom.h>
+#include <atlcrack.h>  // 2
+#include <atlctrls.h>  // 2
+#include <atlmisc.h>  // 2
+#include <atlsafe.h>  // 1
+#include <atltheme.h>  // 1
+#include <atlwin.h>  // 2
+*/
+
+#include <commctrl.h>  // 2
+#include <commdlg.h>  // 3
+#include <cryptuiapi.h>  // 2
+#include <dwmapi.h>
+#include <Objbase.h>  // 2
+#include <objidl.h>  // 1
+#include <ole2.h>  // 1
+#include <oleacc.h>  // 2
+#include <oleauto.h>  // 1
+#include <oleidl.h>  // 1
+#include <propkey.h>  // 2
+#include <propvarutil.h>  // 2
+#include <pstore.h>  // 2
+#include <shellapi.h>
+#include <shlguid.h>  // 1
+//#include <shlobj.h>  TODO(joi): Caused conflicts, see if they can be resolved.
+#include <shlwapi.h>  // 1
+#include <shobjidl.h>  // 4
+#include <urlhist.h>  // 2
+#include <wincrypt.h>  // 4
+#include <wtypes.h>  // 2
+
+#include <errno.h>
+#include <fcntl.h>
+#include <limits.h>  // 4
+#include <math.h>
+#include <memory.h>  // 1
+#include <signal.h>
+#include <stdarg.h>  // 1
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>  // 4
+
+#include <algorithm>
+#include <bitset>  // 3
+#include <cmath>
+#include <cstddef>
+#include <cstdio>  // 3
+#include <cstdlib>  // 2
+#include <cstring>
+#include <deque>
+#include <fstream>  // 3
+#include <functional>
+#include <iomanip>  // 2
+#include <iosfwd>  // 2
+#include <iterator>
+#include <limits>
+#include <list>
+#include <map>
+#include <numeric>  // 2
+#include <ostream>
+#include <queue>
+#include <set>
+#include <sstream>
+#include <stack>
+#include <string>
+#include <utility>
+#include <vector>
diff --git a/win_precompile.gypi b/win_precompile.gypi
new file mode 100644
index 000000000..90bcdff61
--- /dev/null
+++ b/win_precompile.gypi
@@ -0,0 +1,20 @@
+# Copyright (c) 2011 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 this file to make targets in your .gyp use the default
+# precompiled header on Windows.
+
+{
+  'conditions': [
+    # Restricted to VS 2010 until GYP also supports suppressing
+    # precompiled headers on .c files in VS 2008.
+    ['OS=="win" and (MSVS_VERSION=="2010" or MSVS_VERSION=="2010e")', {
+      'target_defaults': {
+        'msvs_precompiled_header': '<(DEPTH)/build/precompile.h',
+        'msvs_precompiled_source': '<(DEPTH)/build/precompile.cc',
+        'sources': ['<(DEPTH)/build/precompile.cc'],
+      },
+    }],
+  ],
+}