> any C++ compiler can be made to use exponentially large amounts of memory and CPU time by feeding it a specially crafted program

Doesn’t even need to be specially crafted, I wrote a <100 line C++ program to solve a Project Euler problem just yesterday that runs in 0.5s with ~2.5GB of RAM but takes clang++ 50GB of RAM to compile. I could easily tweak a param to make it use any multiple of that to exhaust the RAM on any workstation. Surprised me a bit honestly.