[C++][Go] Optimizing away a “while(1);”

Reference:
https://stackoverflow.com/questions/3592557/optimizing-away-a-while1-in-c0x

This has been known, just a recap.

#include <iostream>

int main() {
  while(1) 
    ;
  std::cout << "Hello" << std::endl;
}

or this:

endless:
  goto endless;

ISO Reference:
https://timsong-cpp.github.io/cppwp/intro.progress#1

The implementation may assume that any thread will eventually do one of the following:

• terminate, 
• make a call to a library I/O function, 
• perform an access through a volatile glvalue, 
• or perform a synchronization operation or an atomic operation.

In C++, modifying a global (or local) variable is not a side-effecting operation. Only actions in the list above count as defined behavior thus compiler will not end an infinite loop. (in C++17 this isn't true anymore, compiler will honor an infinite loop no matter how.)

More Reference:

https://blog.regehr.org/archives/161


GO:
Go however has this issue of optimizing away the infinite loop in go 1.8:
https://github.com/golang/go/issues/19182