OS: Windows 10 x64, version 1703 (build 15063.726)

Steps to reproduce:

1. Install MSYS2, default values
2. Update MSYS2, pacman -Syyu, use ctrl+C to close pacman then close window
3. Update MSYS2 again, pacman -Syyu
4. Install GCC and nano, pacman -Sy mingw-w64-x86_64-gcc nano
5. Open a MinGW 64bit session from the Start menu
6. Open nano to create a new .cpp file, nano test.cpp
7. Paste following code into nano,

int main(int argc, char **argv) {
  int *array = new int[100];
  array[0] = 0;
  int res = array[argc + 100];  // BOOM
  delete [] array;
  return res;
}

8. Try to compile, g++ -fsanitize=address -O1 test.cpp -o test

Output:

C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/7.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: cannot find -lasan
collect2.exe: error: ld returned 1 exit status

So, is AddressSanitizer available within the MinGW-w64 project?