main.cpp (GTx0 32bit x86 sample)

//NOTE: This code is meant to be compiled on a 32bit x86 machine. I don't have a 64bit machine available to do this for that arch at the moment.

#include <stdio.h>

extern "C" int asm_data;
extern "C" int asm_func(int x); //_Z7cppfunci, _Z is a prefix to tell us how it's mangled, 7 is the length of the function name, i means 1 int param
extern "C" int asm_caller(int x, int y); //_Z7cppfuncii, which translates to how you predict it to.

int cppfunc(int x){ return x << 2; } //Same as asm_func(), so we won't use it.
int cppfunc(int x, int y){ return x << y; } //We're not actually going to use this one.

int main(int argc, char** argv){
        int input1 = 6, input2 = 1;
        printf("asm_func(%i) returns %i\n", input1, asm_func(input1));
        printf("asm_caller(%i, %i) return %i\n", input1, input2, asm_caller(input1, input2));
        printf("asm_data = 0x%x\n", asm_data); //No mangling for global data, so it's just as easy the other direction.
        return 0;
}