c++14 - In C++ is it possible to specify which delete operator is used? -

i instrumenting code , noticed c++14 features there 2 new delete operators (from http://en.cppreference.com/w/cpp/memory/new/operator_delete):

these 5-6) called instead of (1-2) if user-defined replacement provided except it's implementation-defined whether (1-2) or (5-6) called when deleting objects of incomplete type , arrays of non-class , trivially-destructible class types (since c++17). standard library implementations identical (1-2).

i have overloaded these , wanted call these 2 exclusively. when overload these 2 gcc don't have problem. clang++ undefined reference operator delete(void*)

here code

void* operator new(long unsigned int howmuch) {     return reinterpret_cast<void*>(0xdeadbeef); }  void* operator new[](long unsigned int howmuch) {     return reinterpret_cast<void*>(0xdeadbeef); }  void operator delete(void* what, long unsigned int howmuch) {         if(what != reinterpret_cast<void*>(0xdeadbeef)) __builtin_trap();         if(howmuch != 1) __builtin_trap(); }  extern "c" void _start() {     delete new char;     asm("syscall" : : "a"(60) : );  } 

compiled gcc: g++ -ggdb -std=c++14 -nostdlib -fno-builtin -fno-exceptions 1.cc there no problem , runs fine.

is possible llvm/clang?