我可以使 clang 可执行文件多小？

Question

I'm just testing to see how small I can make this C++ code

#include <iostream>
using namespace std;

int main() {
    cout << "hi";
}

using this zsh command:

g++ test.cpp -Os -g -o main

but the smallest I can make it is 52 Kb, so is there any way to make it even smaller?

Answer 1

Using your code and compiler flags with g++ 11.2 I get a 35,8kB executable (different result could be explained by using a different compiler version or target system).

1. Removing the -g flag brings the output file's size down to 16,3kB .
2. You can modify your code without changing its functionality in the following way ( 16,0kB ):

#include <stdio.h>

int main(){
    fputs("hi", stdout);
    return 0;  // doesn't change the output, only here for completeness sake
}

3. Using clang to compile above code further reduces output executable's size to 15,9kB .

4. Adding the -s flag: 14,5kB