add some missong LV_USE_... guards

examples/get_started/lv_example_get_started_1.c

@@ -1,4 +1,5 @@
 #include "../../lvgl.h"
+#if LV_BUILD_EXAMPLES
 
 static void btn_event_cb(lv_obj_t * btn, lv_event_t event)
 {
@@ -26,3 +27,5 @@ void lv_example_get_started_1(void)
     lv_label_set_text(label, "Button");                     /*Set the labels text*/
 }
 
+#endif
+

src/extra/layouts/flex/lv_flex.c

@@ -8,6 +8,8 @@
  *********************/
 #include "lv_flex.h"
 
+#if LV_USE_FLEX
+
 /*********************
  *      DEFINES
  *********************/
@@ -446,3 +448,5 @@ static lv_obj_t * get_next_item(lv_obj_t * cont, bool rev, int32_t * item_id)
         else return NULL;
     }
 }
+
+#endif /*LV_USE_FLEX*/

src/extra/layouts/flex/lv_flex.h

@@ -14,6 +14,7 @@ extern "C" {
  *      INCLUDES
  *********************/
 #include "../../../lv_core/lv_obj.h"
+#if LV_USE_FLEX
 
 /*********************
  *      DEFINES
@@ -112,6 +113,8 @@ extern const lv_flex_t lv_flex_even;            /**< Place the items evenly in r
  *      MACROS
  **********************/
 
+#endif  /*LV_USE_FLEX*/
+
 #ifdef __cplusplus
 } /* extern "C" */
 #endif

src/extra/layouts/grid/lv_grid.c

@@ -7,6 +7,7 @@
  *      INCLUDES
  *********************/
 #include "lv_grid.h"
+#if LV_USE_GRID
 
 /*********************
  *      DEFINES
@@ -479,3 +480,5 @@ static lv_coord_t grid_place(lv_coord_t cont_size,  bool auto_size, uint8_t plac
     /*Return the full size of the grid*/
     return total_gird_size;
 }
+
+#endif /*LV_USE_GRID*/

src/extra/layouts/grid/lv_grid.h

@@ -18,6 +18,7 @@ extern "C" {
 /*********************
  *      DEFINES
  *********************/
+#if LV_USE_GRID
 
 /**********************
  *      TYPEDEFS
@@ -123,6 +124,7 @@ extern const lv_grid_t grid_12;
 /**********************
  *      MACROS
  **********************/
+#endif /*LV_USE_GRID*/
 
 #ifdef __cplusplus
 } /* extern "C" */