From f31f023c891f906a6762a69d50978433859a1b9e Mon Sep 17 00:00:00 2001
From: Jonathan Swoboda <154711427+swoboda1337@users.noreply.github.com>
Date: Sun, 23 Nov 2025 23:31:14 -0500
Subject: [PATCH] [esp32] Fix C2 builds (#12050)

---
 esphome/components/esp32/__init__.py         | 6 ++++++
 esphome/components/esp32/pre_build.py.script | 9 +++++++++
 2 files changed, 15 insertions(+)
 create mode 100644 esphome/components/esp32/pre_build.py.script

diff --git a/esphome/components/esp32/__init__.py b/esphome/components/esp32/__init__.py
index 6f577d292..59c602933 100644
--- a/esphome/components/esp32/__init__.py
+++ b/esphome/components/esp32/__init__.py
@@ -883,6 +883,12 @@ async def to_code(config):
         CORE.relative_internal_path(".espressif")
     )
 
+    add_extra_script(
+        "pre",
+        "pre_build.py",
+        Path(__file__).parent / "pre_build.py.script",
+    )
+
     add_extra_script(
         "post",
         "post_build.py",
diff --git a/esphome/components/esp32/pre_build.py.script b/esphome/components/esp32/pre_build.py.script
new file mode 100644
index 000000000..af12275a0
--- /dev/null
+++ b/esphome/components/esp32/pre_build.py.script
@@ -0,0 +1,9 @@
+Import("env")  # noqa: F821
+
+# Remove custom_sdkconfig from the board config as it causes
+# pioarduino to enable some strange hybrid build mode that breaks IDF
+board = env.BoardConfig()
+if "espidf.custom_sdkconfig" in board:
+    del board._manifest["espidf"]["custom_sdkconfig"]
+    if not board._manifest["espidf"]:
+        del board._manifest["espidf"]