Question

Is it possible to bring GCC into an infinite loop by inputting strange source code? And if yes, how? Maybe one could do something with Template Metaprogramming?

Answer 1

Bugs are particularly transient, for example @Pestilence’s answer was found in GCC 4.4.0 and fixed in 4.4.1. For a list of current ways to bring GCC to an infinite loop, check their Bugzilla.

EDIT: I just found a new way, which also crashes Comeau. This is a more satisfying answer, for now. Of course, it should also be fixed soon.

template< int n >
struct a { 
    a< n+1 > operator->() { return a< n+1 >(); }
};

int main() {
    a<0>()->x;
}