This is my code

#include <unistd.h>
#include <stdlib.h>
#include <iostream>

using namespace std;
int main(int argc, char* argv[]) {
  char *var = "TEST=/usr/home";
  putenv(var);
  cout<<getenv("TEST")<<endl; // This works
  var[0]= 'A'; // Crashes as soon as this runs
  cout<<getenv("AEST")<<endl;
  return 0;
}

Output is

/usr/home
zsh: bus error  ./t

If i understand correctly, this var pointer will become part of environmnet itself, so if i update this variable, the getenv should also give me updated stuff
But instead it crashes in mac.

Results in Macbook = It crashes with bus error
Results in Linux = No crash and no output as well, seems like that line is completely just ignored