Name conflict with attribute_t when using M5Unified library alongside Matter library

[kyjibato]

Board

M5Stack Atom

Device Description

M5Stack Atom Lite

Hardware Configuration

No additional hardware attached besides the integrated sensors (M5Unit-ENV)

Version

v3.1.0

IDE Name

Arduino IDE

Operating System

macOS

Flash frequency

80 MHz

PSRAM enabled

no

Upload speed

115200

Description

When compiling an Arduino project that uses the 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) ...

Other Steps to Reproduce

No response

I have checked existing issues, online documentation and the Troubleshooting Guide

• I confirm I have checked existing issues, online documentation and Troubleshooting guide.

[me-no-dev]

Please post this to the M5Unified repository. We can not make changes to matter on our end.

[SuGlider]

It is possible to change the function signature to return esp_matter::attribute_t using the proper qualifier in order to solve the ambiguity.

I'll add a PR and @kyjibato would be able to test it.

[SuGlider]

@kyjibato - please test the PR #10807
It solves this issue.

[kyjibato]

@SuGlider Thank you for your hard work on PR #10807. I tested it in my environment, and it resolves the reported issue. I really appreciate your help.