added support for proxies as drivers back.

source/blender/blenkernel/intern/armature.c

@@ -1502,7 +1502,8 @@ void where_is_armature (bArmature *arm)
 	}
 }
 
-/* if bone layer is protected, copy the data from from->pose */
+/* if bone layer is protected, copy the data from from->pose
+ * when used with linked libraries this copies from the linked pose into the local pose */
 static void pose_proxy_synchronize(Object *ob, Object *from, int layer_protected)
 {
 	bPose *pose= ob->pose, *frompose= from->pose;

source/blender/blenkernel/intern/fcurve.c

@@ -801,13 +801,19 @@ typedef struct DriverVarTypeInfo {
 
 /* ......... */
 
+static ID *dtar_id_ensure_proxy_from(ID *id)
+{
+	if (id && GS(id->name)==ID_OB && ((Object *)id)->proxy_from)
+		return (ID *)(((Object *)id)->proxy_from);
+	return id;
+}
+
 /* Helper function to obtain a value using RNA from the specified source (for evaluating drivers) */
 static float dtar_get_prop_val (ChannelDriver *driver, DriverTarget *dtar)
 {
 	PointerRNA id_ptr, ptr;
 	PropertyRNA *prop;
 	ID *id;
-	char *path;
 	int index;
 	float value= 0.0f;
 	
@@ -815,22 +821,22 @@ static float dtar_get_prop_val (ChannelDriver *driver, DriverTarget *dtar)
 	if ELEM(NULL, driver, dtar)
 		return 0.0f;
 	
-	/* get RNA-pointer for the ID-block given in target */
+	id= dtar_id_ensure_proxy_from(dtar->id);
-	RNA_id_pointer_create(dtar->id, &id_ptr);
-	id= dtar->id;
-	path= dtar->rna_path;
 	
 	/* error check for missing pointer... */
 	// TODO: tag the specific target too as having issues
 	if (id == NULL) {
 		printf("Error: driver has an invalid target to use \n");
-		if (G.f & G_DEBUG) printf("\tpath = %s\n", path);
+		if (G.f & G_DEBUG) printf("\tpath = %s\n", dtar->rna_path);
 		driver->flag |= DRIVER_FLAG_INVALID;
 		return 0.0f;
 	}
+
+	/* get RNA-pointer for the ID-block given in target */
+	RNA_id_pointer_create(id, &id_ptr);
 	
 	/* get property to read from, and get value as appropriate */
-	if (RNA_path_resolve_full(&id_ptr, path, &ptr, &prop, &index)) {
+	if (RNA_path_resolve_full(&id_ptr, dtar->rna_path, &ptr, &prop, &index)) {
 		switch (RNA_property_type(prop)) {
 			case PROP_BOOLEAN:
 				if (RNA_property_array_length(&ptr, prop))
@@ -859,7 +865,7 @@ static float dtar_get_prop_val (ChannelDriver *driver, DriverTarget *dtar)
 	}
 	else {
 		if (G.f & G_DEBUG)
-			printf("Driver Evaluation Error: cannot resolve target for %s -> %s \n", id->name, path);
+			printf("Driver Evaluation Error: cannot resolve target for %s -> %s \n", id->name, dtar->rna_path);
 		
 		driver->flag |= DRIVER_FLAG_INVALID;
 		return 0.0f;
@@ -871,14 +877,17 @@ static float dtar_get_prop_val (ChannelDriver *driver, DriverTarget *dtar)
 /* Helper function to obtain a pointer to a Pose Channel (for evaluating drivers) */
 static bPoseChannel *dtar_get_pchan_ptr (ChannelDriver *driver, DriverTarget *dtar)
 {
+	ID *id;
 	/* sanity check */
 	if ELEM(NULL, driver, dtar)
 		return NULL;
-		
+
+	id= dtar_id_ensure_proxy_from(dtar->id);
+
 	/* check if the ID here is a valid object */
-	if ((dtar->id) && GS(dtar->id->name)) {
+	if (id && GS(id->name)) {
-		Object *ob= (Object *)dtar->id;
+		Object *ob= (Object *)id;
-		
+
 		/* get pose, and subsequently, posechannel */
 		return get_pose_channel(ob->pose, dtar->pchan_name);
 	}
@@ -947,12 +956,12 @@ static float dvar_eval_locDiff (ChannelDriver *driver, DriverVar *dvar)
 	DRIVER_TARGETS_USED_LOOPER(dvar)
 	{
 		/* get pointer to loc values to store in */
-		Object *ob= (Object *)dtar->id;
+		Object *ob= (Object *)dtar_id_ensure_proxy_from(dtar->id);
 		bPoseChannel *pchan;
 		float tmp_loc[3];
 		
 		/* check if this target has valid data */
-		if ((ob == NULL) || (GS(dtar->id->name) != ID_OB)) {
+		if ((ob == NULL) || (GS(ob->id.name) != ID_OB)) {
 			/* invalid target, so will not have enough targets */
 			driver->flag |= DRIVER_FLAG_INVALID;
 			return 0.0f;
@@ -1007,14 +1016,14 @@ static float dvar_eval_locDiff (ChannelDriver *driver, DriverVar *dvar)
 static float dvar_eval_transChan (ChannelDriver *driver, DriverVar *dvar)
 {
 	DriverTarget *dtar= &dvar->targets[0];
-	Object *ob= (Object *)dtar->id;
+	Object *ob= (Object *)dtar_id_ensure_proxy_from(dtar->id);
 	bPoseChannel *pchan;
 	float mat[4][4];
 	float eul[3] = {0.0f,0.0f,0.0f};
 	short useEulers=0, rotOrder=ROT_MODE_EUL;
 	
 	/* check if this target has valid data */
-	if ((ob == NULL) || (GS(dtar->id->name) != ID_OB)) {
+	if ((ob == NULL) || (GS(ob->id.name) != ID_OB)) {
 		/* invalid target, so will not have enough targets */
 		driver->flag |= DRIVER_FLAG_INVALID;
 		return 0.0f;
@@ -1281,7 +1290,7 @@ ChannelDriver *fcurve_copy_driver (ChannelDriver *driver)
 float driver_get_variable_value (ChannelDriver *driver, DriverVar *dvar)
 {
 	DriverVarTypeInfo *dvti;
-	
+
 	/* sanity check */
 	if (ELEM(NULL, driver, dvar))
 		return 0.0f;

source/blender/python/intern/bpy_driver.c

@@ -158,8 +158,7 @@ float BPY_pydriver_eval (ChannelDriver *driver)
 	int i;
 
 	/* sanity checks - should driver be executed? */
-	if ((driver == NULL) /*|| (G.f & G_DOSCRIPTLINKS)==0*/)
+	/*if (G.f & G_DOSCRIPTLINKS)==0) return result; */
-		return result;
 
 	/* get the py expression to be evaluated */
 	expr = driver->expression;
@@ -255,24 +254,20 @@ float BPY_pydriver_eval (ChannelDriver *driver)
 
 	/* process the result */
 	if (retval == NULL) {
-		result = pydriver_error(driver);
+		pydriver_error(driver);
-		PyGILState_Release(gilstate);
+		result = 0.0f;
-		return result;
+	} else if((result= (float)PyFloat_AsDouble(retval)) == -1.0f && PyErr_Occurred()) {
+		pydriver_error(driver);
+		Py_DECREF(retval);
+		result = 0.0f;
+
 	}
-
+	else {
-	result = (float)PyFloat_AsDouble(retval);
+		/* all fine, make sure the "invalid expression" flag is cleared */
-	Py_DECREF(retval);
+		driver->flag &= ~DRIVER_FLAG_INVALID;
-
+		Py_DECREF(retval);
-	if ((result == -1) && PyErr_Occurred()) {
-		result = pydriver_error(driver);
-		PyGILState_Release(gilstate);
-		return result;
 	}
 
-	/* all fine, make sure the "invalid expression" flag is cleared */
-	driver->flag &= ~DRIVER_FLAG_INVALID;
-
 	PyGILState_Release(gilstate);
-
 	return result;
 }