Description of problem:

Invalid binary uploaded to arduino mega (ATMEGA2560)

Version-Release number of selected component (if applicable):

arduino-1.8.5-8.fc31.noarch

How reproducible:


Steps to Reproduce:
1. Install arduino package
2. Compile and upload program for atmega2560

Actual results:
Hard to predict behaviour. Sometimes (for small programm) everything works. Most of the time the result is unpredictable. (PC seem to be jumping around, variable are being modified unexpectedly, ...)

Example: with the following code, only "Co" are pushed onto the UART

class Keypads{
  public:
    Keypads() {
      Serial.println("Constructor called!");
    }
    bool check(){
      Serial.println("Checked!");
    }
};

void setup(){
  Serial.begin(9600);
  Keypads s1_keypads;
  s1_keypads.check();
}

void loop(){
}



Expected results:
Correct compilation and upload

Additional info:
With package given on arduino's website, the results are correct