Minimum code to override the terminate handler for both LLVM and GCC. Don't forget to add the --wrap linker arguments, otherwise, this will not work.

terminate_override_hack.cpp

#include <exception>

std::terminate_handler halt = +[]() { while (true) { continue; } };

extern "C" {
#if defined(__clang__)
// Terminate symbol within LLVM
// NOTE: Add linker argument: -Wl,--wrap=__cxa_terminate_handler
std::terminate_handler __wrap___cxa_terminate_handler = halt;
#elif defined(__GNUC__)
// Terminate symbol within GCC (within the __cxxabiv1 namespace)
// NOTE: Add linker argument: -Wl,--wrap=_ZN10__cxxabiv119__terminate_handlerE
std::terminate_handler __wrap__ZN10__cxxabiv119__terminate_handlerE = halt;
#endif
}