Can't clear cin. Stuck at input

Question

When cin fails, it fails for ever. I.e. I can't read anything afterwards and cin.fail() always returns true, no matter how I try to clear it.

Minimal code to recreate:

#include <iostream>
using namespace std;

int main(){
    int d;

    while (!(cin >> d)) // Loop until I get a valid integer
    {
        cin.ignore(9999, '\n');
        cin.clear();
    }

    cout << d << endl;
    return 0;
}

With minimal input:

a<Enter>

I tried all C++ answers under this question, but none of them worked. Strangely enough, fflush(stdin) did a good job.

I use Dev-C++ as my IDE and replaced its packaged GCC with MinGW GCC 6.3.0 from SourceForge. The following arguments are supplied to g++.exe when compiling

-Wall -Wextra -std=c++14 -s -O3 -static-libgcc -static-libstdc++

The same issue has also occurred with GCC 7.2.0 on my Ubuntu without the last two -static arguments.

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As suggested in comments, swapping the order of cin.clear() and cin.ignore() worked. What's the reason for that?