From 1b325a66ce8d72176d14701d46a844aecbbd57ad Mon Sep 17 00:00:00 2001
From: "J. Nick Koston" <nick@home-assistant.io>
Date: Tue, 25 Aug 2026 15:37:15 -0500
Subject: [PATCH] Warn when a consumer ignores the precompiled header

---
 esphome/build_gen/espidf.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/esphome/build_gen/espidf.py b/esphome/build_gen/espidf.py
index b8f5e95db5..f461e0353d 100644
--- a/esphome/build_gen/espidf.py
+++ b/esphome/build_gen/espidf.py
@@ -337,6 +337,7 @@ def _pch_cmake() -> str:
 # a .gch drop out of the TU depfiles, and prepare_pch() touches the
 # header whenever it rebuilds the .gch so consumers recompile.
 target_compile_options(${{COMPONENT_LIB}} PRIVATE
+    "$<$<COMPILE_LANGUAGE:CXX>:-Winvalid-pch>"
     "$<$<COMPILE_LANGUAGE:CXX>:-include>"
     "$<$<COMPILE_LANGUAGE:CXX>:{PCH_HEADER_NAME}>"
 )