CMake Build: Use shared precompile headers

This will make the build directory size smaller, as only two
pch files will be generated. Not one for every target.

Change-Id: I3eec91e7536eab1c62bff8843f075f0ef7b5fff6
Reviewed-by: Tobias Hunger <tobias.hunger@qt.io>

cmake/QtCreatorAPI.cmake

@@ -13,6 +13,10 @@ list(APPEND DEFAULT_DEFINES
   QT_USE_FAST_CONCATENATION
 )
 
+if (WIN32)
+  list(APPEND DEFAULT_DEFINES UNICODE _UNICODE _CRT_SECURE_NO_WARNINGS)
+endif()
+
 #
 # Setup path handling
 #
@@ -284,11 +288,8 @@ endfunction()
 
 function(enable_pch target)
   if (BUILD_WITH_PCH)
-    get_target_property(target_sources ${target} SOURCES)
-    list(LENGTH target_sources target_sources_number)
-    if (${target_sources_number} GREATER "3")
-      set(PCH_FILE "${PROJECT_SOURCE_DIR}/src/shared/qtcreator_pch.h")
-
+    get_target_property(target_type ${target} TYPE)
+    if (NOT ${target_type} STREQUAL "OBJECT_LIBRARY")
       function(_recursively_collect_dependencies input_target)
         get_target_property(input_type ${input_target} TYPE)
         if (${input_type} STREQUAL "INTERFACE_LIBRARY")
@@ -305,15 +306,38 @@ function(enable_pch target)
       endfunction()
       _recursively_collect_dependencies(${target})
 
-      if ("Qt5::Widgets" IN_LIST dependencies)
-        set(PCH_FILE "${PROJECT_SOURCE_DIR}/src/shared/qtcreator_gui_pch.h")
+      function(_add_pch_target pch_target pch_file pch_dependency)
+        if (EXISTS ${pch_file})
+          add_library(${pch_target} STATIC
+            ${CMAKE_BINARY_DIR}/empy_pch.cpp)
+          target_compile_definitions(${pch_target} PRIVATE ${DEFAULT_DEFINES})
+          set_target_properties(${pch_target} PROPERTIES
+            PRECOMPILE_HEADERS ${pch_file})
+          target_link_libraries(${pch_target} PRIVATE ${pch_dependency})
+        endif()
+      endfunction()
+
+      if (NOT TARGET QtCreatorPchGui AND NOT TARGET QtCreatorPchConsole)
+        file(WRITE ${CMAKE_BINARY_DIR}/empy_pch.cpp.in "/*empty file*/")
+        configure_file(
+          ${CMAKE_BINARY_DIR}/empy_pch.cpp.in
+          ${CMAKE_BINARY_DIR}/empy_pch.cpp)
+
+        _add_pch_target(QtCreatorPchGui
+          "${PROJECT_SOURCE_DIR}/src/shared/qtcreator_gui_pch.h" Qt5::Widgets)
+        _add_pch_target(QtCreatorPchConsole
+          "${PROJECT_SOURCE_DIR}/src/shared/qtcreator_pch.h" Qt5::Core)
       endif()
 
-      if (EXISTS ${PCH_FILE})
-        set_target_properties(${target} PROPERTIES PRECOMPILE_HEADERS ${PCH_FILE})
+      set(PCH_TARGET QtCreatorPchConsole)
+      if ("Qt5::Widgets" IN_LIST dependencies)
+        set(PCH_TARGET QtCreatorPchGui)
+      endif()
+
+      if (TARGET ${PCH_TARGET})
+        set_target_properties(${target} PROPERTIES
+          PRECOMPILE_HEADERS_REUSE_FROM ${PCH_TARGET})
       endif()
-    elseif(WITH_DEBUG_CMAKE)
-      message(STATUS "Skipped PCH for ${target}")
     endif()
   endif()
 endfunction()

src/libs/3rdparty/syntax-highlighting/CMakeLists.txt

@@ -1,7 +1,7 @@
 add_qtc_library(KSyntaxHighlighting STATIC
   PUBLIC_INCLUDES autogenerated/ autogenerated/src/lib src/lib
   PUBLIC_DEFINES KSYNTAXHIGHLIGHTING_LIBRARY
-  DEPENDS Qt5::Network Qt5::Gui
+  DEPENDS Qt5::Network Qt5::Widgets
   SOURCES
     autogenerated/src/lib/ksyntaxhighlighting_logging.cpp autogenerated/src/lib/ksyntaxhighlighting_logging.h
     autogenerated/ksyntaxhighlighting_version.h

src/libs/extensionsystem/CMakeLists.txt

@@ -1,6 +1,6 @@
 add_qtc_library(ExtensionSystem
-  DEPENDS Aggregation Utils Qt5::Core Qt5::Widgets
-  PUBLIC_DEPENDS Qt5::Core
+  DEPENDS Aggregation Utils
+  PUBLIC_DEPENDS Qt5::Core Qt5::Widgets
   SOURCES
     extensionsystem_global.h
     invoker.cpp invoker.h

src/libs/tracing/CMakeLists.txt

@@ -6,6 +6,7 @@ endif()
 
 add_qtc_library(Tracing
   DEPENDS Utils Qt5::Qml Qt5::Quick
+  PUBLIC_DEPENDS Qt5::Widgets
   SOURCES ${TEST_SOURCES}
     flamegraph.cpp flamegraph.h
     flamegraphattached.h

tests/auto/toolchaincache/CMakeLists.txt

@@ -1,5 +1,5 @@
 add_qtc_test(tst_toolchaincache
-  DEPENDS ProjectExplorer Qt5::Gui
+  DEPENDS ProjectExplorer Qt5::Widgets
   INCLUDES "${PROJECT_SOURCE_DIR}/src/libs"
   SOURCES tst_toolchaincache.cpp
 )

tests/unit/unittest/CMakeLists.txt

@@ -18,8 +18,6 @@ add_qtc_test(unittest GTEST
     clangrefactoringbackend_lib clangbackend_lib clangpchmanagerbackend_lib
     CPlusPlus Sqlite Utils
   DEFINES
-    QT_NO_CAST_TO_ASCII  QT_RESTRICTED_CAST_FROM_ASCII
-    QT_USE_FAST_OPERATOR_PLUS QT_USE_FAST_CONCATENATION
     UNIT_TESTS
     DONT_CHECK_MESSAGE_COUNTER
     QTC_RESOURCE_DIR="${PROJECT_SOURCE_DIR}/share/qtcreator"