Move the EglOnXBackend to the x11 platforms

Summary:
The EglOnXBackend is no longer needed in the core. It's only needed by
the two x11 platform plugins. To best share it, it's moved into a common
directory and compiled into a static library which in turn is linked by
the two plugins.

Reviewers: #plasma

Subscribers: plasma-devel

Projects: #plasma

Differential Revision: https://phabricator.kde.org/D1413

CMakeLists.txt

@@ -407,7 +407,6 @@ set(kwin_KDEINIT_SRCS
     decorations/decorationrenderer.cpp
     decorations/decorations_logging.cpp
     abstract_egl_backend.cpp
-    eglonxbackend.cpp
     platform.cpp
     shell_client.cpp
     wayland_server.cpp

plugins/platforms/x11/CMakeLists.txt

@@ -1,3 +1,4 @@
+add_subdirectory(common)
 add_subdirectory(standalone)
 if(X11_XCB_FOUND)
     add_subdirectory(windowed)

plugins/platforms/x11/common/CMakeLists.txt

@@ -0,0 +1,2 @@
+add_library(eglx11common STATIC eglonxbackend.cpp)
+target_link_libraries(eglx11common kwin)

plugins/platforms/x11/common/eglonxbackend.cpp

@@ -32,6 +32,8 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 // system
 #include <unistd.h>
 
+Q_LOGGING_CATEGORY(KWIN_CORE, "kwin_core", QtCriticalMsg)
+
 namespace KWin
 {
 

plugins/platforms/x11/standalone/CMakeLists.txt

@@ -9,7 +9,7 @@ if(HAVE_EPOXY_GLX)
 endif()
 
 add_library(KWinX11Platform MODULE ${X11PLATFORM_SOURCES})
-target_link_libraries(KWinX11Platform kwin Qt5::X11Extras)
+target_link_libraries(KWinX11Platform eglx11common kwin Qt5::X11Extras)
 
 install(
     TARGETS

plugins/platforms/x11/windowed/CMakeLists.txt

@@ -6,7 +6,7 @@ set(X11BACKEND_SOURCES
 )
 
 add_library(KWinWaylandX11Backend MODULE ${X11BACKEND_SOURCES})
-target_link_libraries(KWinWaylandX11Backend kwin X11::XCB)
+target_link_libraries(KWinWaylandX11Backend eglx11common kwin X11::XCB)
 
 install(
     TARGETS