class AnalogReadIssue {
  public:
    int value = 0;
    AnalogReadIssue();
};

AnalogReadIssue::AnalogReadIssue() {
  value = analogRead(A0);
}

AnalogReadIssue c;

void setup() {                                                                     
  Serial.begin(115200);
  Serial.print("Pre-init analogRead(A0)=");
  Serial.println(c.value);
  Serial.print("setup analogRead(A0)=");
  Serial.println(analogRead(A0));
}

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

}