Allow to build KConfig without Qt5Gui

Summary:
This is particularly useful for cross-compilation, where we only need the
kconfig_compiler on the host system.

Reviewers: #frameworks, apol, aacid

Reviewed By: aacid

Subscribers: aacid

Tags: #frameworks

Differential Revision: https://phabricator.kde.org/D6994

CMakeLists.txt

@@ -12,7 +12,11 @@ set(CMAKE_MODULE_PATH ${ECM_MODULE_PATH} ${ECM_KDE_MODULE_DIR})
 
 set(REQUIRED_QT_VERSION 5.6.0)
 
-find_package(Qt5 ${REQUIRED_QT_VERSION} CONFIG REQUIRED Gui Xml)
+find_package(Qt5 ${REQUIRED_QT_VERSION} CONFIG REQUIRED Xml)
+option(KCONFIG_USE_GUI "Build components using Qt5Gui" ON)
+if(KCONFIG_USE_GUI)
+    find_package(Qt5 ${REQUIRED_QT_VERSION} CONFIG REQUIRED Gui)
+endif()
 include(KDEInstallDirs)
 include(KDEFrameworkCompilerSettings NO_POLICY_SCOPE)
 include(KDECMakeSettings)

autotests/CMakeLists.txt

@@ -52,6 +52,7 @@ ecm_add_tests(
 
 target_include_directories(test_kconf_update PRIVATE ${CMAKE_CURRENT_BINARY_DIR}/../src/kconf_update)
 
+if(TARGET Qt5::Gui)
 ecm_add_tests(
    kconfigguitest.cpp
    kconfigloadertest.cpp
@@ -67,4 +68,4 @@ set_tests_properties(kconfigcore-kconfignokdehometest PROPERTIES RUN_SERIAL TRUE
 set_tests_properties(kconfiggui-kconfigguitest PROPERTIES RUN_SERIAL TRUE)
 
 add_subdirectory(kconfig_compiler)
-
+endif()

src/CMakeLists.txt

@@ -1,5 +1,7 @@
 add_subdirectory(core)
-add_subdirectory(gui)
+if(TARGET Qt5::Gui)
+    add_subdirectory(gui)
+endif()
 add_subdirectory(kconfig_compiler)
 add_subdirectory(kconf_update)
 add_subdirectory(kreadconfig)

src/core/CMakeLists.txt

@@ -1,6 +1,3 @@
-
-find_package(Qt5Core ${REQUIRED_QT_VERSION} REQUIRED NO_MODULE)
-
 set(libkconfigcore_SRCS
    kconfig.cpp
    kconfigbase.cpp

src/gui/CMakeLists.txt

@@ -1,7 +1,3 @@
-
-find_package(Qt5Gui ${REQUIRED_QT_VERSION} REQUIRED NO_MODULE)
-find_package(Qt5Xml ${REQUIRED_QT_VERSION} REQUIRED NO_MODULE)
-
 set(libkconfiggui_SRCS
    kconfiggui.cpp
    kconfiggroupgui.cpp

src/kconf_update/CMakeLists.txt

@@ -1,5 +1,3 @@
-find_package(Qt5Core ${REQUIRED_QT_VERSION} REQUIRED NO_MODULE)
-
 remove_definitions(-DQT_NO_CAST_FROM_ASCII)
 
 ########### next target ###############

src/kconfig_compiler/CMakeLists.txt

@@ -16,8 +16,6 @@ else()
     add_executable(KF5::kconfig_compiler ALIAS kconfig_compiler)
 endif()
 
-find_package(Qt5Xml ${REQUIRED_QT_VERSION} REQUIRED NO_MODULE)
-
 target_link_libraries(kconfig_compiler Qt5::Xml)
 
 ecm_mark_nongui_executable(kconfig_compiler)