Merge remote-tracking branch 'origin/api_varint_split_32_64' into integration

script/api_protobuf/api_protobuf.py

@@ -1937,6 +1937,9 @@ def get_varint64_ifdef(
     }
     if not ifdefs:
         return False, None
+    if None in ifdefs:
+        # At least one 64-bit varint field is unconditional, so the guard must be unconditional.
+        return True, None
     ifdefs.discard(None)
     return True, ifdefs.pop() if len(ifdefs) == 1 else None
 
@@ -2601,22 +2604,32 @@ def main() -> None:
     )
 
     # Find the ifdef guard for 64-bit varint fields (int64/uint64/sint64).
-    # Emitted before proto.h so parse_wide_() and 64-bit accessors are available.
+    # Generated into api_pb2_defines.h so proto.h can include it, ensuring
+    # consistent ProtoVarInt layout across all translation units.
     has_varint64, varint64_guard = get_varint64_ifdef(file, message_ifdef_map)
 
+    # Generate api_pb2_defines.h — included by proto.h to ensure all translation
+    # units see USE_API_VARINT64 consistently (avoids ODR violations in ProtoVarInt).
+    defines_content = FILE_HEADER
+    defines_content += "#pragma once\n\n"
+    defines_content += '#include "esphome/core/defines.h"\n'
+    if has_varint64:
+        lines = [
+            "#ifndef USE_API_VARINT64",
+            "#define USE_API_VARINT64",
+            "#endif",
+        ]
+        defines_content += "\n".join(wrap_with_ifdef(lines, varint64_guard))
+        defines_content += "\n"
+    defines_content += "\nnamespace esphome::api {}  // namespace esphome::api\n"
+
+    with open(root / "api_pb2_defines.h", "w", encoding="utf-8") as f:
+        f.write(defines_content)
+
     content = FILE_HEADER
     content += """\
 #pragma once
 
-#include "esphome/core/defines.h"
-"""
-    if has_varint64:
-        content += "\n".join(
-            wrap_with_ifdef(["#define USE_API_VARINT64"], varint64_guard)
-        )
-        content += "\n"
-
-    content += """\
 #include "esphome/core/string_ref.h"
 
 #include "proto.h"