Sync is built-in and mandatory.

Xext/Makefile.am

@@ -21,16 +21,16 @@ endif
 # Sources always included in libXextbuiltin.la & libXext.la
 BUILTIN_SRCS =			\
 	bigreq.c		\
+        geext.c			\
 	shape.c			\
 	sleepuntil.c		\
 	sleepuntil.h		\
+	sync.c			\
 	xcmisc.c		\
-	xtest.c                 \
-        geext.c
+	xtest.c
 
-# Sources always included in libXextmodule.la & libXext.la
-MODULE_SRCS =			\
-	sync.c
+# Sources always included in libXextmodule.la & libXext.la. That's right, zero.
+MODULE_SRCS =
 
 # Optional sources included if extension enabled by configure.ac rules
 

hw/xfree86/dixmods/extmod/modinit.c

@@ -65,15 +65,6 @@ static ExtensionModule extensionModules[] = {
 	NULL
     },
 #endif
-#ifdef XSYNC
-    {
-	SyncExtensionInit,
-	SYNC_NAME,
-	&noSyncExtension,
-	NULL,
-	NULL
-    },
-#endif
 #ifdef SCREENSAVER
     {
 	ScreenSaverExtensionInit,

hw/xfree86/dixmods/extmod/modinit.h

@@ -27,13 +27,6 @@ extern void XTestExtensionInit(INITARGS);
 extern void XTestExtension1Init(INITARGS);
 #endif
 
-#ifdef XSYNC
-extern void SyncExtensionInit(INITARGS);
-#define _SYNC_SERVER
-#include <X11/extensions/sync.h>
-#include <X11/extensions/syncstr.h>
-#endif
-
 #ifdef SCREENSAVER
 extern void ScreenSaverExtensionInit (INITARGS);
 #include <X11/extensions/saver.h>

hw/xfree86/loader/dixsym.c

@@ -372,9 +372,6 @@ _X_HIDDEN void *dixLookupTab[] = {
 #ifdef XCSECURITY
     SYMVAR(noSecurityExtension)
 #endif
-#ifdef XSYNC
-    SYMVAR(noSyncExtension)
-#endif
 #ifdef RES
     SYMVAR(noResExtension)
 #endif

include/globals.h

@@ -89,10 +89,6 @@ extern Bool noRenderExtension;
 extern Bool noSecurityExtension;
 #endif
 
-#ifdef XSYNC
-extern Bool noSyncExtension;
-#endif
-
 #ifdef RES
 extern Bool noResExtension;
 #endif

mi/miinitext.c

@@ -116,9 +116,6 @@ extern Bool noRenderExtension;
 #ifdef XCSECURITY
 extern Bool noSecurityExtension;
 #endif
-#ifdef XSYNC
-extern Bool noSyncExtension;
-#endif
 #ifdef RES
 extern Bool noResExtension;
 #endif
@@ -225,9 +222,7 @@ extern void ScreenSaverExtensionInit (INITARGS);
 extern void XvExtensionInit(INITARGS);
 extern void XvMCExtensionInit(INITARGS);
 #endif
-#ifdef XSYNC
 extern void SyncExtensionInit(INITARGS);
-#endif
 #ifdef XKB
 extern void XkbExtensionInit(INITARGS);
 #endif
@@ -336,9 +331,6 @@ static ExtensionToggle ExtensionToggleList[] =
 #ifdef XCSECURITY
     { "SECURITY", &noSecurityExtension },
 #endif
-#ifdef XSYNC
-    { "SYNC", &noSyncExtension },
-#endif
 #ifdef RES
     { "X-Resource", &noResExtension },
 #endif
@@ -442,9 +434,7 @@ InitExtensions(int argc, char *argv[])
       XvMCExtensionInit();
     }
 #endif
-#ifdef XSYNC
-    if (!noSyncExtension) SyncExtensionInit();
-#endif
+    SyncExtensionInit();
 #if defined(XKB)
     if (!noXkbExtension) XkbExtensionInit();
 #endif
@@ -532,6 +522,7 @@ static ExtensionModule staticExtensions[] = {
 #ifdef XIDLE
     { XIdleExtensionInit, "XIDLE", &noXIdleExtension, NULL, NULL },
 #endif
+    { SyncExtensionInit, "SYNC", NULL, NULL, NULL },
 #ifdef XKB
     { XkbExtensionInit, XkbName, &noXkbExtension, NULL, NULL },
 #endif

os/WaitFor.c

@@ -364,7 +364,6 @@ WaitForSomething(int *pClientsReady)
 	    curclient = XFD_FD(&savedClientsReadable, i);
 	    client_index = GetConnectionTranslation(curclient);
 #endif
-#ifdef XSYNC
 		/*  We implement "strict" priorities.
 		 *  Only the highest priority client is returned to
 		 *  dix.  If multiple clients at the same priority are
@@ -391,7 +390,6 @@ WaitForSomething(int *pClientsReady)
 		 *  clients get batched together
 		 */
 		else if (client_priority == highest_priority)
-#endif
 		{
 		    pClientsReady[nready++] = client_index;
 		}

os/utils.c

@@ -159,9 +159,6 @@ _X_EXPORT Bool noRenderExtension = FALSE;
 #ifdef XCSECURITY
 _X_EXPORT Bool noSecurityExtension = FALSE;
 #endif
-#ifdef XSYNC
-_X_EXPORT Bool noSyncExtension = FALSE;
-#endif
 #ifdef RES
 _X_EXPORT Bool noResExtension = FALSE;
 #endif