From 329f8f77ab1a9d0ca2edbbbf23ffbaacaf7b7345 Mon Sep 17 00:00:00 2001
From: James Turner <zakalawe@mac.com>
Date: Thu, 9 Nov 2017 15:34:44 +0200
Subject: [PATCH] Fix broken private header detection

---
 CMakeLists.txt | 40 +++++++++++++++++++++++++++++++++++++++-
 1 file changed, 39 insertions(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index a48be6ce2..800932c34 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -314,6 +314,28 @@ if (USE_DBUS)
 else()
 endif (USE_DBUS)
 
+##############################################################################
+
+function(check_private_headers_exist module private_includes_var)
+message(STATUS "Checking whether private include directories for module ${module} exist")
+foreach(_dir ${private_includes_var})
+  if(NOT EXISTS "${_dir}")
+    message(FATAL_ERROR "The private include directory ${_dir} for module ${module} do not exist! Please make sure your Qt5 installation contains private headers.\nThe required directories:\n  ${private_includes_var}")
+  endif()
+endforeach()
+endfunction()
+function(check_private_header_exists _file _dirs)
+set(_found FALSE)
+foreach(_dir ${_dirs})
+  if(EXISTS "${_dir}/${_file}")
+    set(_found TRUE)
+  endif()
+endforeach()
+if(NOT _found)
+  message(FATAL_ERROR "The private include file ${_file} was not found in directory ${_dirs}! Please make sure your Qt5 installation contains private headers.")
+endif()
+endfunction()
+
 ##############################################################################
 ## Qt5 setup setup
 if (ENABLE_QT)
@@ -323,7 +345,23 @@ if (ENABLE_QT)
         message(STATUS "Will enable Qt launcher GUI")
         message(STATUS "  Qt5Widgets version: ${Qt5Widgets_VERSION_STRING}")
         message(STATUS "  Qt5Widgets include dir: ${Qt5Widgets_INCLUDE_DIRS}")
-        message(STATUS "  QtQuick private header: ${Qt5Quick_PRIVATE_INCLUDE_DIRS}")
+
+        # copied from KDAB's GammaRay CMakeLists.txt
+        # Sanity checking, we need private includes for the following modules
+
+        check_private_headers_exist("Qt5Gui" "${Qt5Gui_PRIVATE_INCLUDE_DIRS}")
+
+        #HACK: CMake with broken Qt5Quick_PRIVATE_INCLUDE_DIRS
+        if (NOT "${Qt5Quick_PRIVATE_INCLUDE_DIRS}" MATCHES "/QtQuick/")
+            string(REPLACE "/QtCore" "/QtQuick" replaceme "${Qt5Core_PRIVATE_INCLUDE_DIRS}")
+            list(APPEND Qt5Quick_PRIVATE_INCLUDE_DIRS ${Qt5Qml_PRIVATE_INCLUDE_DIRS})
+            list(APPEND Qt5Quick_PRIVATE_INCLUDE_DIRS ${replaceme})
+            list(REMOVE_DUPLICATES Qt5Quick_PRIVATE_INCLUDE_DIRS)
+        endif()
+        check_private_header_exists("private/qquickitem_p.h" "${Qt5Quick_PRIVATE_INCLUDE_DIRS}")
+
+        message(STATUS "  Qt5Quick private include dir: ${Qt5Quick_PRIVATE_INCLUDE_DIRS}")
+        
         set(HAVE_QT 1)
     else()
         # don't try to build FGQCanvas if Qt wasn't found correctly