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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