Create IMPORTED CMake targets for executables.

Although IMPORTED executables are not extra special, this is more future-proof
in terms of both future CMake features and future our needs - it is possible
that we would want to add a property to an executable at TARGET scope, which
would not be possible if it is just a path.

Change-Id: I649c601e004b21603c5fa97de0b7c397813ed68d
Reviewed-by: Brad King <brad.king@kitware.com>
Reviewed-by: Stephen Kelly <stephen.kelly@kdab.com>

6 files changed, 80 insertions, 21 deletions

diff --git a/src/corelib/Qt5CoreConfigExtras.cmake.in b/src/corelib/Qt5CoreConfigExtras.cmake.in
index 4f918691ae..e5f7e14d82 100644
--- a/src/corelib/Qt5CoreConfigExtras.cmake.in
+++ b/src/corelib/Qt5CoreConfigExtras.cmake.in
@@ -1,15 +1,47 @@
 
 get_filename_component(_qt5_corelib_install_prefix \"${CMAKE_CURRENT_LIST_DIR}/$${CMAKE_RELATIVE_INSTALL_DIR}\" ABSOLUTE)
 
+if (NOT TARGET Qt5::qmake)
+    add_executable(Qt5::qmake IMPORTED)
+
+    set_target_properties(Qt5::qmake PROPERTIES
+!!IF isEmpty(CMAKE_BIN_DIR_IS_ABSOLUTE)
+        IMPORTED_LOCATION \"${_qt5_corelib_install_prefix}/$${CMAKE_BIN_DIR}qmake$$CMAKE_BIN_SUFFIX\"
+!!ELSE
+        IMPORTED_LOCATION \"$${CMAKE_BIN_DIR}qmake$$CMAKE_BIN_SUFFIX\"
+!!ENDIF
+    )
+endif()
+
+if (NOT TARGET Qt5::moc)
+    add_executable(Qt5::moc IMPORTED)
+
+    set_target_properties(Qt5::moc PROPERTIES
+!!IF isEmpty(CMAKE_BIN_DIR_IS_ABSOLUTE)
+        IMPORTED_LOCATION \"${_qt5_corelib_install_prefix}/$${CMAKE_BIN_DIR}moc$$CMAKE_BIN_SUFFIX\"
+!!ELSE
+        IMPORTED_LOCATION \"$${CMAKE_BIN_DIR}moc$$CMAKE_BIN_SUFFIX\"
+!!ENDIF
+    )
+    # For CMake automoc feature
+    get_target_property(QT_MOC_EXECUTABLE Qt5::moc LOCATION)
+endif()
+
+if (NOT TARGET Qt5::rcc)
+    add_executable(Qt5::rcc IMPORTED)
+
+    set_target_properties(Qt5::rcc PROPERTIES
 !!IF isEmpty(CMAKE_BIN_DIR_IS_ABSOLUTE)
-set(QT_QMAKE_EXECUTABLE \"${_qt5_corelib_install_prefix}/$${CMAKE_BIN_DIR}qmake$$CMAKE_BIN_SUFFIX\")
-set(QT_MOC_EXECUTABLE \"${_qt5_corelib_install_prefix}/$${CMAKE_BIN_DIR}moc$$CMAKE_BIN_SUFFIX\")
-set(QT_RCC_EXECUTABLE \"${_qt5_corelib_install_prefix}/$${CMAKE_BIN_DIR}rcc$$CMAKE_BIN_SUFFIX\")
+        IMPORTED_LOCATION \"${_qt5_corelib_install_prefix}/$${CMAKE_BIN_DIR}rcc$$CMAKE_BIN_SUFFIX\"
 !!ELSE
-set(QT_QMAKE_EXECUTABLE \"$${CMAKE_BIN_DIR}qmake$$CMAKE_BIN_SUFFIX\")
-set(QT_MOC_EXECUTABLE \"$${CMAKE_BIN_DIR}moc$$CMAKE_BIN_SUFFIX\")
-set(QT_RCC_EXECUTABLE \"$${CMAKE_BIN_DIR}rcc$$CMAKE_BIN_SUFFIX\")
+        IMPORTED_LOCATION \"$${CMAKE_BIN_DIR}rcc$$CMAKE_BIN_SUFFIX\"
 !!ENDIF
+    )
+endif()
+
+set(Qt5Core_QMAKE_EXECUTABLE Qt5::qmake)
+set(Qt5Core_MOC_EXECUTABLE Qt5::moc)
+set(Qt5Core_RCC_EXECUTABLE Qt5::rcc)
 
 !!IF isEmpty(CMAKE_DATA_DIR_IS_ABSOLUTE)
 list(APPEND Qt5Core_INCLUDE_DIRS \"${_qt5_corelib_install_prefix}/mkspecs/default\")
diff --git a/src/corelib/Qt5CoreMacros.cmake b/src/corelib/Qt5CoreMacros.cmake
index 9d5f85a441..7cccefd014 100644
--- a/src/corelib/Qt5CoreMacros.cmake
+++ b/src/corelib/Qt5CoreMacros.cmake
@@ -108,13 +108,13 @@ macro(QT5_CREATE_MOC_COMMAND infile outfile moc_flags moc_options)
         string(REPLACE ";" "\n" _moc_parameters "${_moc_parameters}")
         file(WRITE ${_moc_parameters_file} "${_moc_parameters}")
         add_custom_command(OUTPUT ${outfile}
-                           COMMAND ${QT_MOC_EXECUTABLE} @${_moc_outfile_name}_parameters
+                           COMMAND ${Qt5Core_MOC_EXECUTABLE} @${_moc_outfile_name}_parameters
                            DEPENDS ${infile}
                            ${_moc_working_dir}
                            VERBATIM)
     else()
         add_custom_command(OUTPUT ${outfile}
-                           COMMAND ${QT_MOC_EXECUTABLE}
+                           COMMAND ${Qt5Core_MOC_EXECUTABLE}
                            ARGS ${moc_flags} ${moc_options} -o ${outfile} ${infile}
                            DEPENDS ${infile} VERBATIM)
     endif()
@@ -202,7 +202,7 @@ function(QT5_ADD_RESOURCES outfiles )
         endif()
 
         add_custom_command(OUTPUT ${outfile}
-                           COMMAND ${QT_RCC_EXECUTABLE}
+                           COMMAND ${Qt5Core_RCC_EXECUTABLE}
                            ARGS ${rcc_options} -name ${outfilename} -o ${outfile} ${infile}
                            MAIN_DEPENDENCY ${infile}
                            DEPENDS ${_RC_DEPENDS} "${out_depends}" VERBATIM)
diff --git a/src/dbus/Qt5DBusConfigExtras.cmake.in b/src/dbus/Qt5DBusConfigExtras.cmake.in
index 2aa857fecb..03640f8ccd 100644
--- a/src/dbus/Qt5DBusConfigExtras.cmake.in
+++ b/src/dbus/Qt5DBusConfigExtras.cmake.in
@@ -1,10 +1,29 @@
 
-get_filename_component(_qt5_install_prefix \"${CMAKE_CURRENT_LIST_DIR}/$${CMAKE_RELATIVE_INSTALL_DIR}\" ABSOLUTE)
+get_filename_component(_qt5_dbus_install_prefix \"${CMAKE_CURRENT_LIST_DIR}/$${CMAKE_RELATIVE_INSTALL_DIR}\" ABSOLUTE)
 
+if (NOT TARGET Qt5::qdbuscpp2xml)
+    add_executable(Qt5::qdbuscpp2xml IMPORTED)
+
+    set_target_properties(Qt5::qdbuscpp2xml PROPERTIES
 !!IF isEmpty(CMAKE_BIN_DIR_IS_ABSOLUTE)
-set(QT_DBUSCPP2XML_EXECUTABLE \"${_qt5_install_prefix}/$${CMAKE_BIN_DIR}qdbuscpp2xml$$CMAKE_BIN_SUFFIX\")
-set(QT_DBUSXML2CPP_EXECUTABLE \"${_qt5_install_prefix}/$${CMAKE_BIN_DIR}qdbusxml2cpp$$CMAKE_BIN_SUFFIX\")
+        IMPORTED_LOCATION \"${_qt5_dbus_install_prefix}/$${CMAKE_BIN_DIR}qdbuscpp2xml$$CMAKE_BIN_SUFFIX\"
 !!ELSE
-set(QT_DBUSCPP2XML_EXECUTABLE \"$${CMAKE_BIN_DIR}qdbuscpp2xml$$CMAKE_BIN_SUFFIX\")
-set(QT_DBUSXML2CPP_EXECUTABLE \"$${CMAKE_BIN_DIR}qdbusxml2cpp$$CMAKE_BIN_SUFFIX\")
+        IMPORTED_LOCATION \"$${CMAKE_BIN_DIR}qdbuscpp2xml$$CMAKE_BIN_SUFFIX\"
 !!ENDIF
+    )
+endif()
+
+if (NOT TARGET Qt5::qdbusxml2cpp)
+    add_executable(Qt5::qdbusxml2cpp IMPORTED)
+
+    set_target_properties(Qt5::qdbusxml2cpp PROPERTIES
+!!IF isEmpty(CMAKE_BIN_DIR_IS_ABSOLUTE)
+        IMPORTED_LOCATION \"${_qt5_dbus_install_prefix}/$${CMAKE_BIN_DIR}qdbusxml2cpp$$CMAKE_BIN_SUFFIX\"
+!!ELSE
+        IMPORTED_LOCATION \"$${CMAKE_BIN_DIR}qdbusxml2cpp$$CMAKE_BIN_SUFFIX\"
+!!ENDIF
+    )
+endif()
+
+set(Qt5DBus_QDBUSCPP2XML_EXECUTABLE Qt5::qdbuscpp2xml)
+set(Qt5DBus_QDBUSXML2CPP_EXECUTABLE Qt5::qdbusxml2cpp)
diff --git a/src/dbus/Qt5DBusMacros.cmake b/src/dbus/Qt5DBusMacros.cmake
index 852dc759e0..ff497e8ebc 100644
--- a/src/dbus/Qt5DBusMacros.cmake
+++ b/src/dbus/Qt5DBusMacros.cmake
@@ -57,7 +57,7 @@ function(QT5_ADD_DBUS_INTERFACE _sources _interface _basename)
     endif()
 
     add_custom_command(OUTPUT "${_impl}" "${_header}"
-        COMMAND ${QT_DBUSXML2CPP_EXECUTABLE} ${_params} -p ${_basename} ${_infile}
+        COMMAND ${Qt5DBus_QDBUSXML2CPP_EXECUTABLE} ${_params} -p ${_basename} ${_infile}
         DEPENDS ${_infile} VERBATIM)
 
     set_source_files_properties("${_impl}" PROPERTIES SKIP_AUTOMOC TRUE)
@@ -111,7 +111,7 @@ function(QT5_GENERATE_DBUS_INTERFACE _header) # _customName OPTIONS -some -optio
     endif()
 
     add_custom_command(OUTPUT ${_target}
-        COMMAND ${QT_DBUSCPP2XML_EXECUTABLE} ${_qt4_dbus_options} ${_in_file} -o ${_target}
+        COMMAND ${Qt5DBus_QDBUSCPP2XML_EXECUTABLE} ${_qt4_dbus_options} ${_in_file} -o ${_target}
         DEPENDS ${_in_file} VERBATIM
     )
 endfunction()
@@ -135,12 +135,12 @@ function(QT5_ADD_DBUS_ADAPTOR _sources _xml_file _include _parentClass) # _optio
 
     if(_optionalClassName)
         add_custom_command(OUTPUT "${_impl}" "${_header}"
-          COMMAND ${QT_DBUSXML2CPP_EXECUTABLE} -m -a ${_basename} -c ${_optionalClassName} -i ${_include} -l ${_parentClass} ${_infile}
+          COMMAND ${Qt5DBus_QDBUSXML2CPP_EXECUTABLE} -m -a ${_basename} -c ${_optionalClassName} -i ${_include} -l ${_parentClass} ${_infile}
           DEPENDS ${_infile} VERBATIM
         )
     else()
         add_custom_command(OUTPUT "${_impl}" "${_header}"
-          COMMAND ${QT_DBUSXML2CPP_EXECUTABLE} -m -a ${_basename} -i ${_include} -l ${_parentClass} ${_infile}
+          COMMAND ${Qt5DBus_QDBUSXML2CPP_EXECUTABLE} -m -a ${_basename} -i ${_include} -l ${_parentClass} ${_infile}
           DEPENDS ${_infile} VERBATIM
         )
     endif()
diff --git a/src/widgets/Qt5WidgetsConfigExtras.cmake.in b/src/widgets/Qt5WidgetsConfigExtras.cmake.in
index 64c9c50a8e..27f9c2e5a6 100644
--- a/src/widgets/Qt5WidgetsConfigExtras.cmake.in
+++ b/src/widgets/Qt5WidgetsConfigExtras.cmake.in
@@ -1,8 +1,16 @@
 
 get_filename_component(_qt5_widgets_install_prefix \"${CMAKE_CURRENT_LIST_DIR}/$${CMAKE_RELATIVE_INSTALL_DIR}\" ABSOLUTE)
 
+if (NOT TARGET Qt5::uic)
+    add_executable(Qt5::uic IMPORTED)
+
+    set_target_properties(Qt5::uic PROPERTIES
 !!IF isEmpty(CMAKE_BIN_DIR_IS_ABSOLUTE)
-set(QT_UIC_EXECUTABLE \"${_qt5_widgets_install_prefix}/$${CMAKE_BIN_DIR}uic$$CMAKE_BIN_SUFFIX\")
+        IMPORTED_LOCATION \"${_qt5_widgets_install_prefix}/$${CMAKE_BIN_DIR}uic$$CMAKE_BIN_SUFFIX\"
 !!ELSE
-set(QT_UIC_EXECUTABLE \"$${CMAKE_BIN_DIR}uic$$CMAKE_BIN_SUFFIX\")
+        IMPORTED_LOCATION \"$${CMAKE_BIN_DIR}uic$$CMAKE_BIN_SUFFIX\"
 !!ENDIF
+    )
+endif()
+
+set(Qt5Widgets_UIC_EXECUTABLE Qt5::uic)
diff --git a/src/widgets/Qt5WidgetsMacros.cmake b/src/widgets/Qt5WidgetsMacros.cmake
index 88f259191e..f5e7b7f050 100644
--- a/src/widgets/Qt5WidgetsMacros.cmake
+++ b/src/widgets/Qt5WidgetsMacros.cmake
@@ -56,7 +56,7 @@ function(QT5_WRAP_UI outfiles )
         get_filename_component(infile ${it} ABSOLUTE)
         set(outfile ${CMAKE_CURRENT_BINARY_DIR}/ui_${outfile}.h)
         add_custom_command(OUTPUT ${outfile}
-          COMMAND ${QT_UIC_EXECUTABLE}
+          COMMAND ${Qt5Widgets_UIC_EXECUTABLE}
           ARGS ${ui_options} -o ${outfile} ${infile}
           MAIN_DEPENDENCY ${infile} VERBATIM)
         list(APPEND ${outfiles} ${outfile})