Enabling C++ Exceptions compiler option

[srgbin]

Board

ESP32-C3

Device Description

ESP32-C3

Hardware Configuration

no

Version

v2.0.2

IDE Name

Arduino IDE

Operating System

Ubuntu 20.04

Flash frequency

80Mhz

PSRAM enabled

no

Upload speed

115200

Description

Compiling ESP32 BLE Arduino library by nkolban requires the C++ Exceptions compiler option to be enabled.

Sketch

/*
    Based on Neil Kolban example for IDF: https://github.com/nkolban/esp32-snippets/blob/master/cpp_utils/tests/BLE%20Tests/SampleServer.cpp
    Ported to Arduino ESP32 by Evandro Copercini
    updates by chegewara
*/

#include <BLEDevice.h>
#include <BLEUtils.h>
#include <BLEServer.h>

// See the following for generating UUIDs:
// https://www.uuidgenerator.net/

#define SERVICE_UUID        "4fafc201-1fb5-459e-8fcc-c5c9c331914b"
#define CHARACTERISTIC_UUID "beb5483e-36e1-4688-b7f5-ea07361b26a8"

void setup() {
  Serial.begin(115200);
  Serial.println("Starting BLE work!");

  BLEDevice::init("Long name works now");
  BLEServer *pServer = BLEDevice::createServer();
  BLEService *pService = pServer->createService(SERVICE_UUID);
  BLECharacteristic *pCharacteristic = pService->createCharacteristic(
                                         CHARACTERISTIC_UUID,
                                         BLECharacteristic::PROPERTY_READ |
                                         BLECharacteristic::PROPERTY_WRITE
                                       );

  pCharacteristic->setValue("Hello World says Neil");
  pService->start();
  // BLEAdvertising *pAdvertising = pServer->getAdvertising();  // this still is working for backward compatibility
  BLEAdvertising *pAdvertising = BLEDevice::getAdvertising();
  pAdvertising->addServiceUUID(SERVICE_UUID);
  pAdvertising->setScanResponse(true);
  pAdvertising->setMinPreferred(0x06);  // functions that help with iPhone connections issue
  pAdvertising->setMinPreferred(0x12);
  BLEDevice::startAdvertising();
  Serial.println("Characteristic defined! Now you can read it in your phone!");
}

void loop() {
  // put your main code here, to run repeatedly:
  delay(2000);
}

Debug Message

#error "C++ exception handling must be enabled within make menuconfig. See Compiler Options > Enable C++ Exceptions."

Other Steps to Reproduce

Enabling option in the sdkconfig file does not solve the problem

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

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

[atanisoft]

C++ Exceptions ARE enabled in 2.0.x:

arduino-esp32/tools/sdk/esp32/sdkconfig

Lines 233 to 234 in 6a7bcab

	CONFIG_COMPILER_CXX_EXCEPTIONS=y
	CONFIG_COMPILER_CXX_EXCEPTIONS_EMG_POOL_SIZE=0

Is there a reason you are not using the built-in BLE library that is based on the no longer maintained https://github.com/nkolban/esp32-snippets/ repository?

[srgbin]

C++ Exceptions ARE disabled in 2.0.x: for esp32c3

arduino-esp32/tools/sdk/esp32c3/sdkconfig

Line 205 in 6a7bcab

# CONFIG_COMPILER_CXX_EXCEPTIONS is not set

I am using the library https://github.com/nkolban/ESP32_BLE_Arduino. By built-in BLE library do you mean the ArduinoBLE library https://www.arduino.cc/en/Reference/ArduinoBLE?
Indicated that this library does not support esp32c3.

[atanisoft]

Ahh, normally these are kept in sync. I'm not sure why the C3 file would not have it enabled whereas the others do.

If you can, please open a PR to modify this file and @me-no-dev will review for merge and it will show up over here in this repository soon thereafter via an IDF sync PR.

[igrr]

@me-no-dev I think we could convert the existing target-specific sdkconfig files into:

sdkconfig.defaults (common options which are different from the default ones)
sdkconfig.defaults.esp32 (esp32-specific options)
sdkconfig.defaults.esp32s2 (esp32s2-specific options)

and so on.

https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-guides/build-system.html#target-dependent-sdkconfig-defaults
(i can submit a PR to arduino-lib-builder for this, if you agree)

[srgbin]

Great, it would be great if you submit a PR for this.

[me-no-dev]

@me-no-dev I think we could convert the existing target-specific sdkconfig files into:

sdkconfig.defaults (common options which are different from the default ones) sdkconfig.defaults.esp32 (esp32-specific options) sdkconfig.defaults.esp32s2 (esp32s2-specific options)

and so on.

https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-guides/build-system.html#target-dependent-sdkconfig-defaults (i can submit a PR to arduino-lib-builder for this, if you agree)

I do agree :)