Thanks for your response! It did make a difference:
-rwxrwxr-x 1 admin admin 9219 Feb 24 18:39 hello2*
-rwxrwxr-x 1 admin admin 13662 Feb 24 18:39 hello1*
-rwxrwxr-x 1 admin admin 8377 Feb 24 17:25 hello_c*
However, statically linked C program's size is still smaller than the rust's:
$ gcc -o hello_c hello.c -static
-rwxrwxr-x 1 admin admin 883717 Feb 24 19:26 hello_c*
Thanks
________________________________
From: Corey Richardson <[email protected]>
The size comes from statically linking to the standard library and
runtime. To keep size down, you can pass `-C prefer-dynamic` to rustc
to link to them dynamically instead.
On Mon, Feb 24, 2014 at 6:23 PM, S.A. <[email protected]> wrote:
> Hello,
>
> I am new to rust and have a question on what options to pass to rustc
> to reduce the size of the executable. I see a huge variation between the
> exec generated from a simple C vs Rust program:
> ::::::::::::::
> hello1.rs
> ::::::::::::::
> fn main () {
> println!("Hello World!");
> }
> ::::::::::::::
> hello2.rs
> ::::::::::::::
> use std::io::stdio;
>
> fn main () {
> stdio::println("Hello World!");
> }
> ::::::::::::::
> hello.c
> ::::::::::::::
> #include <stdio.h>
> main () {
> printf ("Hello World!\n");
> }
>
> Compilations:
> $ gcc -o hello_c hello.c
> $ rustc hello1.rs
> $ rustc hello2.rs
>
> Outputs from the above are:
> -rwxrwxr-x 1 admin admin 8377 Feb 24 17:25 hello_c*
> -rwxrwxr-x 1 admin admin 2874699 Feb 24 17:25 hello2*
> -rwxrwxr-x 1 admin admin 2879032 Feb 24 17:25 hello1*
>
> As you can see the sizes of the rust execs (hello1 and hello2) are
> far more than the simple C's.
>
> Set of linked libraries are:
> $ ldd hello_c hello1 hello2
> hello_c:
> linux-vdso.so.1 => (0x00007fff00bfe000)
> libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f440cfc3000)
> /lib64/ld-linux-x86-64.so.2 (0x00007f440d397000)
> hello1:
> linux-vdso.so.1 => (0x00007fff8effe000)
> libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007fbf2e1df000)
> /lib64/ld-linux-x86-64.so.2 (0x00007fbf2e5b3000)
> libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007fbf2dfda000)
> libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007fbf2dcde000)
> libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0
> (0x00007fbf2dac1000)
> libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1
> (0x00007fbf2d8aa000)
> librt.so.1 => /lib/x86_64-linux-gnu/librt.so.1 (0x00007fbf2d6a2000)
> hello2:
> linux-vdso.so.1 => (0x00007fffef7fe000)
> libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0
> (0x00007fc1853b2000)
> librt.so.1 => /lib/x86_64-linux-gnu/librt.so.1 (0x00007fc1851a9000)
> libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007fc184de9000)
> /lib64/ld-linux-x86-64.so.2 (0x00007fc1855e3000)
> libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007fc184be5000)
> libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007fc1848e8000)
> libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1
> (0x00007fc1846d2000)
>
> Can someone shed some light on this.
>
> Thanks
>
>
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