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#include <cstdlib>
#include <stdexcept>
 
void f(){return rand()<100?throw std::runtime_error("NULL"):void();}
#define NULL (f(), 0)
 
int* p = NULL;
 
int main() {}

prog.cpp:5:1: warning: "NULL" redefined
In file included from /usr/include/unistd.h:197,
                 from /usr/lib/gcc/i686-pc-linux-gnu/4.3.4/include/g++-v4/i686-pc-linux-gnu/bits/gthr-default.h:44,
                 from /usr/lib/gcc/i686-pc-linux-gnu/4.3.4/include/g++-v4/i686-pc-linux-gnu/bits/gthr.h:132,
                 from /usr/lib/gcc/i686-pc-linux-gnu/4.3.4/include/g++-v4/ext/atomicity.h:39,
                 from /usr/lib/gcc/i686-pc-linux-gnu/4.3.4/include/g++-v4/bits/basic_string.h:46,
                 from /usr/lib/gcc/i686-pc-linux-gnu/4.3.4/include/g++-v4/string:58,
                 from /usr/lib/gcc/i686-pc-linux-gnu/4.3.4/include/g++-v4/stdexcept:44,
                 from prog.cpp:2:
/usr/lib/gcc/i686-pc-linux-gnu/4.3.4/include/stddef.h:400:1: warning: this is the location of the previous definition
prog.cpp:7: error: invalid conversion from ‘int’ to ‘int*’

Standard output is empty