Why does the Rust compiler generate huge executables?

Question

Compiling a simple hello world application like this:

fn main() {
    println!("Hello, World!");
}

Generates a relatively huge 822 KB executable using the default compiler options ( rustc hello.rs ).

Why does this happen and what is the best way to reduce the size of the executable?

Answer 1

1. The standard library is linked statically by default. You can change that by passing the -C prefer-dynamic option to the compiler.

2. Rust is still a very young language with an incompletely optimized compiler. There is still a lot of room left for improvements in compilation speed, code speed and size, wording of error messages and so on.

Answer 2

rustc -C opt-level=2 hello.rs给出4kb二进制