Description

When compiling an Arduino project that uses the Arduino-ESP32 core Matter library (v3.1.0) together with M5Unified (v0.2.2) on M5Stack Atom, I encounter a compilation error caused by an ambiguous reference to attribute_t. It appears that the Matter library defines attribute_t in esp_matter_core.h, and M5Unified (via M5GFX) also declares attribute_t as an enum in enum.hpp.

Sketch

#include <M5Unified.h> #include <Matter.h> void setup() { M5.begin(); Matter.begin(); // ... } void loop() { M5.update(); // ... }

Debug Message

In file included from .../MatterGenericSwitch.h:20, from .../Matter.h:22, from src/main.cpp:23: /.../MatterEndPoint.h:41:3: error: reference to 'attribute_t' is ambiguous 41 | attribute_t *getAttribute(uint32_t cluster_id, uint32_t attribute_id) { | ^~~~~~~~~~~ ... (multiple lines with similar 'attribute_t' is ambiguous errors) ... 

Related espressif/arduino-esp32#10804