Use pre-compiled headers when building Qt with cmake

Some modules define their own manually-maintained lists, and we can rely
on the headers generated by each module to include in the pch as well
e.g. QtCore/QtCore.

There's also e.g. QtWidgetDepends for QtWidgets, but this only
works for modules, not for tools, examples or other applications.
For now we'll use the Qt<Module>/Qt<Module> headers for the
modules we depend on.

Building with PCH can be disabled with -DBUILD_WITH_PCH=NO, and it only
works for versions of CMake newer than 3.15.20190829.

Change-Id: Iae52bd69acfdfd58f4cd20d3cfa3c7f42775f732
Reviewed-by: Qt CMake Build Bot
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>

17 files changed, 37 insertions, 14 deletions

diff --git a/src/concurrent/CMakeLists.txt b/src/concurrent/CMakeLists.txt
index b0d90e40ba..f330f10a1f 100644
--- a/src/concurrent/CMakeLists.txt
+++ b/src/concurrent/CMakeLists.txt
@@ -29,11 +29,11 @@ add_qt_module(Concurrent
         Qt::CorePrivate
     PUBLIC_LIBRARIES
         Qt::Core
+    PRECOMPILED_HEADER
+        "../corelib/global/qt_pch.h"
 )
 
 #### Keys ignored in scope 1:.:.:concurrent.pro:<TRUE>:
-# CONFIG = "exceptions"
-# PRECOMPILED_HEADER = "../corelib/global/qt_pch.h"
 # _LOADED = "qt_module"
 
 ## Scopes:
diff --git a/src/corelib/CMakeLists.txt b/src/corelib/CMakeLists.txt
index 2959939458..47ba9ce7fc 100644
--- a/src/corelib/CMakeLists.txt
+++ b/src/corelib/CMakeLists.txt
@@ -250,6 +250,11 @@ add_qt_module(Core
     PUBLIC_LIBRARIES  # special case:
         Qt::Platform # special case:
     DISABLE_TOOLS_EXPORT # special case:
+    PRECOMPILED_HEADER
+        global/qt_pch.h
+    NO_PCH_SOURCES
+        text/qstring_compat.cpp
+        tools/qvector_msvc.cpp
     # special case begin
     # Generated in QtBaseGlobalTargets
     EXTRA_CMAKE_FILES ${QT_CORE_RESOURCE_GENERATED_FILE_PATH}
diff --git a/src/gui/CMakeLists.txt b/src/gui/CMakeLists.txt
index b5297cad62..1702f0f9d3 100644
--- a/src/gui/CMakeLists.txt
+++ b/src/gui/CMakeLists.txt
@@ -264,6 +264,10 @@ add_qt_module(Gui
         ZLIB::ZLIB
     PUBLIC_LIBRARIES
         Qt::Core
+    NO_PCH_SOURCES
+        "painting/qdrawhelper.cpp"
+    PRECOMPILED_HEADER
+        "kernel/qt_gui_pch.h"
 )
 
 # Resources:
diff --git a/src/network/CMakeLists.txt b/src/network/CMakeLists.txt
index 85ee368df5..7e392d393c 100644
--- a/src/network/CMakeLists.txt
+++ b/src/network/CMakeLists.txt
@@ -60,6 +60,8 @@ add_qt_module(Network
         ZLIB::ZLIB
     PUBLIC_LIBRARIES
         Qt::Core
+    PRECOMPILED_HEADER
+        "../corelib/global/qt_pch.h"
 )
 
 #### Keys ignored in scope 1:.:.:network.pro:<TRUE>:
diff --git a/src/platformsupport/edid/CMakeLists.txt b/src/platformsupport/edid/CMakeLists.txt
index 948cb7e091..adb2d43cc0 100644
--- a/src/platformsupport/edid/CMakeLists.txt
+++ b/src/platformsupport/edid/CMakeLists.txt
@@ -15,10 +15,11 @@ add_qt_module(EdidSupport
         Qt::CorePrivate
     PUBLIC_LIBRARIES
         Qt::Core
+    PRECOMPILED_HEADER
+        "../../corelib/global/qt_pch.h"
 )
 
 #### Keys ignored in scope 1:.:.:edid.pro:<TRUE>:
 # CONFIG = "static" "internal_module"
 # MODULE = "edid_support"
-# PRECOMPILED_HEADER = "../../corelib/global/qt_pch.h"
 # _LOADED = "qt_module"
diff --git a/src/platformsupport/eglconvenience/CMakeLists.txt b/src/platformsupport/eglconvenience/CMakeLists.txt
index a6a6633d03..e2cb21521b 100644
--- a/src/platformsupport/eglconvenience/CMakeLists.txt
+++ b/src/platformsupport/eglconvenience/CMakeLists.txt
@@ -19,12 +19,13 @@ add_qt_module(EglSupport
         Qt::CorePrivate
         Qt::GuiPrivate
         EGL::EGL # special case
+    PRECOMPILED_HEADER
+        "../../corelib/global/qt_pch.h"
 )
 
 #### Keys ignored in scope 1:.:eglconvenience.pro:<NONE>:
 # CONFIG = "static" "internal_module" "egl"
 # MODULE = "egl_support"
-# PRECOMPILED_HEADER = "../../corelib/global/qt_pch.h"
 # _LOADED = "qt_module"
 
 ## Scopes:
diff --git a/src/platformsupport/eventdispatchers/CMakeLists.txt b/src/platformsupport/eventdispatchers/CMakeLists.txt
index 5e88450023..a85af287a0 100644
--- a/src/platformsupport/eventdispatchers/CMakeLists.txt
+++ b/src/platformsupport/eventdispatchers/CMakeLists.txt
@@ -17,12 +17,13 @@ add_qt_module(EventDispatcherSupport
     PUBLIC_LIBRARIES
         Qt::Core
         Qt::Gui
+    PRECOMPILED_HEADER
+        "../../corelib/global/qt_pch.h"
 )
 
 #### Keys ignored in scope 1:.:.:eventdispatchers.pro:<TRUE>:
 # CONFIG = "static" "internal_module"
 # MODULE = "eventdispatcher_support"
-# PRECOMPILED_HEADER = "../../corelib/global/qt_pch.h"
 # _LOADED = "qt_module"
 
 ## Scopes:
diff --git a/src/platformsupport/fbconvenience/CMakeLists.txt b/src/platformsupport/fbconvenience/CMakeLists.txt
index 05ee44b967..51bbdfe176 100644
--- a/src/platformsupport/fbconvenience/CMakeLists.txt
+++ b/src/platformsupport/fbconvenience/CMakeLists.txt
@@ -21,10 +21,11 @@ add_qt_module(FbSupport
     PUBLIC_LIBRARIES
         Qt::Core
         Qt::Gui
+    PRECOMPILED_HEADER
+        "../../corelib/global/qt_pch.h"
 )
 
 #### Keys ignored in scope 1:.:.:fbconvenience.pro:<TRUE>:
 # CONFIG = "static" "internal_module"
 # MODULE = "fb_support"
-# PRECOMPILED_HEADER = "../../corelib/global/qt_pch.h"
 # _LOADED = "qt_module"
diff --git a/src/platformsupport/fontdatabases/CMakeLists.txt b/src/platformsupport/fontdatabases/CMakeLists.txt
index 2e42a71cb2..d6e92bb2f2 100644
--- a/src/platformsupport/fontdatabases/CMakeLists.txt
+++ b/src/platformsupport/fontdatabases/CMakeLists.txt
@@ -18,12 +18,13 @@ add_qt_module(FontDatabaseSupport
     PUBLIC_LIBRARIES
         Qt::Core
         Qt::Gui
+    PRECOMPILED_HEADER
+        "../../corelib/global/qt_pch.h"
 )
 
 #### Keys ignored in scope 1:.:.:fontdatabases.pro:<TRUE>:
 # CONFIG = "static" "internal_module"
 # MODULE = "fontdatabase_support"
-# PRECOMPILED_HEADER = "../../corelib/global/qt_pch.h"
 # _LOADED = "qt_module"
 
 ## Scopes:
diff --git a/src/platformsupport/input/CMakeLists.txt b/src/platformsupport/input/CMakeLists.txt
index 859d2d33ad..681d103a82 100644
--- a/src/platformsupport/input/CMakeLists.txt
+++ b/src/platformsupport/input/CMakeLists.txt
@@ -22,12 +22,13 @@ add_qt_module(InputSupport
         Qt::Core
         Qt::DeviceDiscoverySupport
         Qt::Gui
+    PRECOMPILED_HEADER
+        "../../corelib/global/qt_pch.h"
 )
 
 #### Keys ignored in scope 3:.:.:input-support.pro:<TRUE>:
 # CONFIG = "static" "internal_module"
 # MODULE = "input_support"
-# PRECOMPILED_HEADER = "../../corelib/global/qt_pch.h"
 # _LOADED = "qt_module"
 
 ## Scopes:
diff --git a/src/platformsupport/input/xkbcommon/CMakeLists.txt b/src/platformsupport/input/xkbcommon/CMakeLists.txt
index 1a96d5eafe..50c86bb5b8 100644
--- a/src/platformsupport/input/xkbcommon/CMakeLists.txt
+++ b/src/platformsupport/input/xkbcommon/CMakeLists.txt
@@ -19,12 +19,13 @@ add_qt_module(XkbCommonSupport
         Qt::Core
         Qt::Gui
         XKB::XKB
+    PRECOMPILED_HEADER
+        "../../../corelib/global/qt_pch.h"
 )
 
 #### Keys ignored in scope 1:.:.:xkbcommon.pro:<TRUE>:
 # CONFIG = "static" "internal_module"
 # MODULE = "xkbcommon_support"
-# PRECOMPILED_HEADER = "../../../corelib/global/qt_pch.h"
 # _LOADED = "qt_module"
 
 ## Scopes:
diff --git a/src/platformsupport/linuxaccessibility/CMakeLists.txt b/src/platformsupport/linuxaccessibility/CMakeLists.txt
index af48f9d57d..023f17197b 100644
--- a/src/platformsupport/linuxaccessibility/CMakeLists.txt
+++ b/src/platformsupport/linuxaccessibility/CMakeLists.txt
@@ -39,10 +39,11 @@ add_qt_module(LinuxAccessibilitySupport
         Qt::Core
         Qt::DBus
         Qt::Gui
+    PRECOMPILED_HEADER
+        "../../corelib/global/qt_pch.h"
 )
 
 #### Keys ignored in scope 1:.:.:linuxaccessibility.pro:<TRUE>:
 # CONFIG = "static" "internal_module"
 # MODULE = "linuxaccessibility_support"
-# PRECOMPILED_HEADER = "../../corelib/global/qt_pch.h"
 # _LOADED = "qt_module"
diff --git a/src/platformsupport/services/CMakeLists.txt b/src/platformsupport/services/CMakeLists.txt
index b926030e12..52b96aff24 100644
--- a/src/platformsupport/services/CMakeLists.txt
+++ b/src/platformsupport/services/CMakeLists.txt
@@ -17,12 +17,13 @@ add_qt_module(ServiceSupport
     PUBLIC_LIBRARIES
         Qt::Core
         Qt::Gui
+    PRECOMPILED_HEADER
+        "../../corelib/global/qt_pch.h"
 )
 
 #### Keys ignored in scope 1:.:.:services.pro:<TRUE>:
 # CONFIG = "static" "internal_module"
 # MODULE = "service_support"
-# PRECOMPILED_HEADER = "../../corelib/global/qt_pch.h"
 # _LOADED = "qt_module"
 
 ## Scopes:
diff --git a/src/platformsupport/vkconvenience/CMakeLists.txt b/src/platformsupport/vkconvenience/CMakeLists.txt
index 325da3f8f8..feee14dafc 100644
--- a/src/platformsupport/vkconvenience/CMakeLists.txt
+++ b/src/platformsupport/vkconvenience/CMakeLists.txt
@@ -20,10 +20,11 @@ add_qt_module(VulkanSupport
     PUBLIC_LIBRARIES
         Qt::Core
         Qt::Gui
+    PRECOMPILED_HEADER
+        "../../corelib/global/qt_pch.h"
 )
 
 #### Keys ignored in scope 1:.:.:vkconvenience.pro:<TRUE>:
 # CONFIG = "static" "internal_module"
 # MODULE = "vulkan_support"
-# PRECOMPILED_HEADER = "../../corelib/global/qt_pch.h"
 # _LOADED = "qt_module"
diff --git a/src/sql/CMakeLists.txt b/src/sql/CMakeLists.txt
index 8e9345765f..4f420afb99 100644
--- a/src/sql/CMakeLists.txt
+++ b/src/sql/CMakeLists.txt
@@ -27,11 +27,12 @@ add_qt_module(Sql
         Qt::CorePrivate
     PUBLIC_LIBRARIES
         Qt::Core
+    PRECOMPILED_HEADER
+        "../corelib/global/qt_pch.h"
 )
 
 #### Keys ignored in scope 1:.:.:sql.pro:<TRUE>:
 # MODULE_PLUGIN_TYPES = "sqldrivers"
-# PRECOMPILED_HEADER = "../corelib/global/qt_pch.h"
 # SQL_P = "sql"
 # _LOADED = "qt_module"
 
diff --git a/src/widgets/CMakeLists.txt b/src/widgets/CMakeLists.txt
index f3abc16550..2d4299dedc 100644
--- a/src/widgets/CMakeLists.txt
+++ b/src/widgets/CMakeLists.txt
@@ -63,6 +63,8 @@ add_qt_module(Widgets
     PUBLIC_LIBRARIES
         Qt::Core
         Qt::Gui
+    PRECOMPILED_HEADER
+        "kernel/qt_widgets_pch.h"
 )
 
 add_dependencies(Widgets ${QT_CMAKE_EXPORT_NAMESPACE}::uic)  # special case
diff --git a/src/xml/CMakeLists.txt b/src/xml/CMakeLists.txt
index 6c7ad3489e..d31f092e5d 100644
--- a/src/xml/CMakeLists.txt
+++ b/src/xml/CMakeLists.txt
@@ -19,7 +19,6 @@ add_qt_module(Xml
 )
 
 #### Keys ignored in scope 1:.:.:xml.pro:<TRUE>:
-# PRECOMPILED_HEADER = <EMPTY>
 # _LOADED = "qt_module"
 
 ## Scopes: