CMake Build: Add qtdiag to Dependencies install target

Change-Id: If1c56ff6e366ec4d5c4bb97e4a176cf9cf8dc4c5
Reviewed-by: Alessandro Portale <alessandro.portale@qt.io>

cmake/CMakeLists.txt

@@ -41,6 +41,18 @@ if (CMAKE_VERSION VERSION_GREATER_EQUAL 3.16)
     ${exclusion_mask}
   )
 
+  # QtCreator's "System Information..." needs qtdiag
+  set(qtdiag_destination ${IDE_BIN_PATH})
+  if (NOT APPLE AND NOT WIN32)
+    set(qtdiag_destination ${IDE_LIBRARY_BASE_PATH}/Qt/bin)
+  endif()
+  install(PROGRAMS
+    "${QT_BASE_DIR}/bin/qtdiag${CMAKE_EXECUTABLE_SUFFIX}"
+    DESTINATION ${qtdiag_destination}
+    COMPONENT Dependencies
+    EXCLUDE_FROM_ALL
+  )
+
   # Analyze the binaries and install missing dependencies if they are
   # found the CMAKE_PREFIX_PATH e.g. Qt, Clang
   configure_file(InstallDependentSharedObjects.cmake.in InstallDependentSharedObjects.cmake @ONLY)

cmake/QtCreatorAPI.cmake

@@ -1044,7 +1044,18 @@ function(add_qtc_executable name)
             \"Prefix=\${qt_conf_binaries}\n\"
           )
         endif()
-
+        if (WIN32 OR APPLE)
+          file(RELATIVE_PATH qt_binaries
+            \"\${install_prefix}/\${base_dir}\"
+            \"\${install_prefix}/${IDE_BIN_PATH}\"
+          )
+          if (NOT qt_binaries)
+            set(qt_binaries .)
+          endif()
+          file(APPEND \"\${CMAKE_INSTALL_PREFIX}/\${location}/qt.conf\"
+            \"# Needed by QtCreator for qtdiag\n\"
+            \"Binaries=\${qt_binaries}\n\")
+        endif()
       endfunction()
       if(APPLE)
         create_qt_conf(\"${_EXECUTABLE_PATH}\" \"${IDE_DATA_PATH}/..\")