find_me.cpp

#if _WINDOWS
#define WIN32_LEAN_AND_MEAN
#include <iostream>
#include <Windows.h>

int main(int argc, const char * argv[])
{
	char path[MAX_PATH];
	GetModuleFileNameA(nullptr, path, sizeof(path));

	std::cout << path << std::endl;
}
#else
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <linux/limits.h>

int main()
{
	char tmp[PATH_MAX];
	auto result = readlink("/proc/self/exe", tmp, PATH_MAX);
	tmp[result] = '\0';
	printf("%s\n", tmp);

	char path[PATH_MAX] {};
	realpath(tmp, path);

	printf("%s\n", path);
}
#endif