twin/compton: make CONFIG_XSYNC autoconfigurable to fix FTBFS with older libXext versions which doesn't provide XSyncFence

ConfigureChecks.cmake

@@ -136,6 +136,13 @@ if( WITH_XCOMPOSITE )
     tde_message_fatal( "xext is required for xcomposite support, but was not found on your system" )
   endif( )
 
+  # for (twin/compton)
+  # older libXext (e.g.in debian-6.0) doesn't provide XSyncFence
+  tde_save_and_set( CMAKE_REQUIRED_INCLUDES   "${XEXT_INCLUDE_DIRS}" )
+  tde_save_and_set( CMAKE_REQUIRED_LIBRARIES  "${XEXT_LIBRARIES}" )
+  check_symbol_exists( "XSyncCreateFence" "X11/Xlib.h;X11/extensions/sync.h" HAVE_XEXT_XSYNCFENCE )
+  tde_restore( CMAKE_REQUIRED_LIBRARIES )
+  tde_restore( CMAKE_REQUIRED_INCLUDES )
 endif( )
 
 

twin/compton-tde/CMakeLists.txt

@@ -28,31 +28,35 @@ include_directories(
 # TDE to compton config option map
 #  WITH_XINNERAMA         -> CONFIG_XINERAMA
 #  WITH_XRANDR            -> CONFIG_XANDR
+#  HAVE_XEXT_XSYNCFENCE   -> CONFIG_XSYNC
 #  WITH_OPENGL            -> CONFIG_VSYNC_OPENGL
 #  WITH_OPENGL            -> CONFIG_VSYNC_OPENGL_GLSL
 #  WITH_OPENGL            -> CONFIG_VSYNC_OPENGL_FBO
-#  WITH_OPENGL            -> CONFIG_GLX_XSYNC
 #  WITH_PCRE              -> CONFIG_REGEX_PCRE
 #  WITH_PCRE              -> CONFIG_REGEX_PCRE_JIT
 #  WITH_LIBCONFIG         -> CONFIG_LIBCONFIG
 #
 #  HAVE_LIBCONFIG_OLD_API -> CONFIG_LIBCONFIG_LEGACY (set up in compton_config.h)
+#  CONFIG_XSYNC           -> CONFIG_GLX_SYNC
 #
 #  CONFIG_DBUS              - always ON
 #  CONFIG_C2                - always ON
-#  CONFIG_XSYNC             - always ON (utilieses Xext)
 
 # TODO: think about some configuration option for CONFIG_VSYNC_DRM
+# NOTE: HAVE__XEXT_XSYNCFENCE is an automatically detected feature that shows
+#       that libXext provides coresponding feature.
 
 add_definitions("-std=c99")
 
 set( compton_SRCS compton.c )
 
+set( CONFIG_XSYNC ${HAVE_XEXT_XSYNCFENCE} )
+
 if( WITH_OPENGL )
   set( CONFIG_VSYNC_OPENGL      ${WITH_OPENGL} )
   set( CONFIG_VSYNC_OPENGL_GLSL ${WITH_OPENGL} )
   set( CONFIG_VSYNC_OPENGL_FBO  ${WITH_OPENGL} )
-  set( CONFIG_GLX_XSYNC         ${WITH_OPENGL} )
+  set( CONFIG_GLX_SYNC          ${CONFIG_XSYNC} )
   list( APPEND compton_LIBRARIES ${GL_LIBRARIES})
   list( APPEND compton_SRCS opengl.c )
 endif( )

twin/compton-tde/common.h

@@ -61,7 +61,7 @@
 // Whether to enable X Sync support.
 // #define CONFIG_XSYNC 1
 // Whether to enable GLX Sync support.
-// #define CONFIG_GLX_XSYNC 1
+// #define CONFIG_GLX_SYNC 1
 
 // TDE specific options
 // #define USE_ENV_HOME 1

twin/compton-tde/compton_config.h.cmake

@@ -21,7 +21,7 @@
 #define CONFIG_C2 1
 
 // Whether to enable X Sync support.
-#define CONFIG_XSYNC 1
+#cmakedefine CONFIG_XSYNC 1
 
 // Whether to enable OpenGL support
 #cmakedefine CONFIG_VSYNC_OPENGL 1
@@ -30,7 +30,7 @@
 // Whether to enable GLX FBO support
 #cmakedefine CONFIG_VSYNC_OPENGL_FBO 1
 // Whether to enable GLX Sync support.
-#cmakedefine CONFIG_GLX_XSYNC 1
+#cmakedefine CONFIG_GLX_SYNC 1
 
 // Whether to enable Xranr support
 #cmakedefine CONFIG_XRANDR 1