error compile when define ISR routine for external interrrupt

I got an error when i try to implement in ISR for external interrupt:

09:30:12 Building the project | Processing...
.pioenvs/optibootPro16MHzatmega328/libFrameworkArduino.a(WInterrupts.o): In function `__vector_2':
collect2: error: ld returned 1 exit status
09:30:16 ERROR | it took 4.49s

Here is implementation

#ifdef EXTERNAL_INTERRUPT
ISR(INT1_vect) {
  CounterControl::GATE_ISR();
};

void CounterControl::GATE_ISR() {

}
#endif

[vlad2005]

Yes, is truth! After i make update i see that not working with old json and need to do exactly what u say (after many try’s). Maybe is better to make an update to this threat to help and other users.

[gepd]

Good to hear!

As recommendation, I realized your JSON file hasn’t the right format, in PlatformIO 3 it should be like this:

{
    "build": {
        "core": "arduino",
        "extra_flags": "-DARDUINO_ARCH_AVR -DARDUINO_AVR_PRO",
        "f_cpu": "16000000L",
        "mcu": "atmega328p",
        "variant": "eightanaloginputs"
    },
    "frameworks": ["arduino"],
    "name": "Arduino Pro Mini Optiboot ATmega328 (5V, 16 MHz)",
    "platform": "atmelavr",
    "upload": {
        "disable_flushing": true,
        "maximum_ram_size": 2048,
        "maximum_size": 32256,
        "protocol": "arduino",
        "require_upload_port" : true,
        "speed": 115200
    },
    "url": "http://arduino.cc/en/Main/ArduinoBoardProMini",
    "vendor": "Arduino"
}

Rename the json file as: optibootPro16MHzatmega328.json That way you will avoid any problem