[core] Fix compilation errors when platform sections have no entities

esphome/components/alarm_control_panel/__init__.py

@@ -348,4 +348,3 @@ async def alarm_control_panel_is_armed_to_code(
 @coroutine_with_priority(100.0)
 async def to_code(config):
     cg.add_global(alarm_control_panel_ns.using)
-    cg.add_define("USE_ALARM_CONTROL_PANEL")

esphome/components/binary_sensor/__init__.py

@@ -654,7 +654,6 @@ async def binary_sensor_is_off_to_code(config, condition_id, template_arg, args)
 
 @coroutine_with_priority(100.0)
 async def to_code(config):
-    cg.add_define("USE_BINARY_SENSOR")
     cg.add_global(binary_sensor_ns.using)
 
 

esphome/components/button/__init__.py

@@ -137,4 +137,3 @@ async def button_press_to_code(config, action_id, template_arg, args):
 @coroutine_with_priority(100.0)
 async def to_code(config):
     cg.add_global(button_ns.using)
-    cg.add_define("USE_BUTTON")

esphome/components/climate/__init__.py

@@ -519,5 +519,4 @@ async def climate_control_to_code(config, action_id, template_arg, args):
 
 @coroutine_with_priority(100.0)
 async def to_code(config):
-    cg.add_define("USE_CLIMATE")
     cg.add_global(climate_ns.using)

esphome/components/cover/__init__.py

@@ -265,5 +265,4 @@ async def cover_control_to_code(config, action_id, template_arg, args):
 
 @coroutine_with_priority(100.0)
 async def to_code(config):
-    cg.add_define("USE_COVER")
     cg.add_global(cover_ns.using)

esphome/components/datetime/__init__.py

@@ -164,7 +164,6 @@ async def register_datetime(var, config):
     cg.add(getattr(cg.App, f"register_{entity_type}")(var))
     CORE.register_platform_component(entity_type, var)
     await setup_datetime_core_(var, config)
-    cg.add_define(f"USE_DATETIME_{config[CONF_TYPE]}")
 
 
 async def new_datetime(config, *args):
@@ -175,7 +174,6 @@ async def new_datetime(config, *args):
 
 @coroutine_with_priority(100.0)
 async def to_code(config):
-    cg.add_define("USE_DATETIME")
     cg.add_global(datetime_ns.using)
 
 

esphome/components/event/__init__.py

@@ -145,5 +145,4 @@ async def event_fire_to_code(config, action_id, template_arg, args):
 
 @coroutine_with_priority(100.0)
 async def to_code(config):
-    cg.add_define("USE_EVENT")
     cg.add_global(event_ns.using)

esphome/components/fan/__init__.py

@@ -400,5 +400,4 @@ async def fan_is_on_off_to_code(config, condition_id, template_arg, args):
 
 @coroutine_with_priority(100.0)
 async def to_code(config):
-    cg.add_define("USE_FAN")
     cg.add_global(fan_ns.using)

esphome/components/light/__init__.py

@@ -285,5 +285,4 @@ async def new_light(config, *args):
 
 @coroutine_with_priority(100.0)
 async def to_code(config):
-    cg.add_define("USE_LIGHT")
     cg.add_global(light_ns.using)

esphome/components/lock/__init__.py

@@ -158,4 +158,3 @@ async def lock_is_off_to_code(config, condition_id, template_arg, args):
 @coroutine_with_priority(100.0)
 async def to_code(config):
     cg.add_global(lock_ns.using)
-    cg.add_define("USE_LOCK")

esphome/components/number/__init__.py

@@ -323,7 +323,6 @@ async def number_in_range_to_code(config, condition_id, template_arg, args):
 
 @coroutine_with_priority(100.0)
 async def to_code(config):
-    cg.add_define("USE_NUMBER")
     cg.add_global(number_ns.using)
 
 

esphome/components/select/__init__.py

@@ -126,7 +126,6 @@ async def new_select(config, *, options: list[str]):
 
 @coroutine_with_priority(100.0)
 async def to_code(config):
-    cg.add_define("USE_SELECT")
     cg.add_global(select_ns.using)
 
 

esphome/components/sensor/__init__.py

@@ -1139,5 +1139,4 @@ def _lstsq(a, b):
 
 @coroutine_with_priority(100.0)
 async def to_code(config):
-    cg.add_define("USE_SENSOR")
     cg.add_global(sensor_ns.using)

esphome/components/switch/__init__.py

@@ -202,4 +202,3 @@ async def switch_is_off_to_code(config, condition_id, template_arg, args):
 @coroutine_with_priority(100.0)
 async def to_code(config):
     cg.add_global(switch_ns.using)
-    cg.add_define("USE_SWITCH")

esphome/components/text/__init__.py

@@ -151,7 +151,6 @@ async def new_text(
 
 @coroutine_with_priority(100.0)
 async def to_code(config):
-    cg.add_define("USE_TEXT")
     cg.add_global(text_ns.using)
 
 

esphome/components/text_sensor/__init__.py

@@ -232,7 +232,6 @@ async def new_text_sensor(config, *args):
 
 @coroutine_with_priority(100.0)
 async def to_code(config):
-    cg.add_define("USE_TEXT_SENSOR")
     cg.add_global(text_sensor_ns.using)
 
 

esphome/components/update/__init__.py

@@ -126,7 +126,6 @@ async def new_update(config):
 
 @coroutine_with_priority(100.0)
 async def to_code(config):
-    cg.add_define("USE_UPDATE")
     cg.add_global(update_ns.using)
 
 

esphome/components/valve/__init__.py

@@ -235,5 +235,4 @@ async def valve_control_to_code(config, action_id, template_arg, args):
 
 @coroutine_with_priority(100.0)
 async def to_code(config):
-    cg.add_define("USE_VALVE")
     cg.add_global(valve_ns.using)

esphome/core/config.py

@@ -419,13 +419,28 @@ async def _add_automations(config):
         await automation.build_automation(trigger, [], conf)
 
 
+# Datetime component has special subtypes that need additional defines
+DATETIME_SUBTYPES = {"date", "time", "datetime"}
+
+
 @coroutine_with_priority(-100.0)
-async def _add_platform_reserves() -> None:
+async def _add_platform_defines() -> None:
-    # Generate compile-time entity count defines for static_entity_vector
+    # Generate compile-time defines for platforms that have actual entities
+    # Only add USE_* and count defines when there are entities
     for platform_name, count in sorted(CORE.platform_counts.items()):
+        if count <= 0:
+            continue
+
         define_name = f"ESPHOME_ENTITY_{platform_name.upper()}_COUNT"
         cg.add_define(define_name, count)
 
+        # Datetime subtypes only use USE_DATETIME_* defines
+        if platform_name in DATETIME_SUBTYPES:
+            cg.add_define(f"USE_DATETIME_{platform_name.upper()}")
+        else:
+            # Regular platforms use USE_* defines
+            cg.add_define(f"USE_{platform_name.upper()}")
+
 
 @coroutine_with_priority(100.0)
 async def to_code(config: ConfigType) -> None:
@@ -449,7 +464,7 @@ async def to_code(config: ConfigType) -> None:
         cg.RawStatement(f"App.reserve_components({len(CORE.component_ids)});"),
     )
 
-    CORE.add_job(_add_platform_reserves)
+    CORE.add_job(_add_platform_defines)
 
     CORE.add_job(_add_automations, config)
 

tests/components/datetime/common.yaml

@@ -1,3 +1,5 @@
 datetime:
 
+date:
+
 time: