Fix AUTOMOC and friends to run only once the tools are built

While building on macOS, AUTOMOC sometimes hanged indefinitely.
The problem was that AUTOMOC was executed for the qmacstyle
plugin before moc was actually built.

Because of an upstream bug in CMake, AUTOMOC was caught in a deadlock
without reporting that spawning the moc process failed. Specifically
if a libuv spawn() call failed, the condition variable for a waiting
thread was not notified, and the thread kept waiting forever for the
process launch to finish.

Fix the dependency by setting the AUTOGEN_TARGET_DEPENDS property
on all targets that have AUTOGEN tools enabled. This makes sure that
moc and friends are built before they are used.

Also add some special cases to disable autogen tools on certain targets
to break cycles between targets.

Fixes: QTBUG-74636
Change-Id: I6e689e63cba1962525f169f332a58498d173c0a6
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>
Reviewed-by: Mikhail Svetkin <mikhail.svetkin@qt.io>

cmake/QtBuild.cmake

@@ -321,6 +321,7 @@ function(qt_autogen_tools target)
                           PROPERTIES
                           AUTO${captitalAutogenTool} ON
                           AUTO${captitalAutogenTool}_EXECUTABLE "$<TARGET_FILE:Qt::${autogen_tool}>")
+    set_property(TARGET ${target} APPEND PROPERTY AUTOGEN_TARGET_DEPENDS Qt::${autogen_tool})
   endforeach()
 
   set_directory_properties(PROPERTIES

src/corelib/CMakeLists.txt

@@ -242,6 +242,8 @@ add_qt_module(Core
         ZLIB::ZLIB
     PUBLIC_LIBRARIES  # special case:
         Qt::Platform
+    DISABLE_AUTOGEN_TOOLS # special case:
+        uic
     # ANDROID_BUNDLED_JAR_DEPENDENCIES = "jar/QtAndroid.jar"
     # ANDROID_LIB_DEPENDENCIES = "plugins/platforms/android/libqtforandroid.so"
     # ANDROID_PERMISSIONS = "android.permission.INTERNET" "android.permission.WRITE_EXTERNAL_STORAGE"

src/tools/uic/CMakeLists.txt

@@ -27,6 +27,8 @@ add_qt_tool(uic
         QT_UIC_CPP_GENERATOR
     INCLUDE_DIRECTORIES
         cpp
+    DISABLE_AUTOGEN_TOOLS # special case:
+        uic rcc
     # QMAKE_TARGET_DESCRIPTION = "Qt User Interface Compiler"
     # _LOADED = "qt_tool"
     # _OPTION = "host_build"