Failed linking to a library that uses inline assembly with asm_sym feature

[ly0va]

What does not work

I tried this code:

// lib.rs
static EIGHTEEN: usize = 18;

#[inline(always)]
pub fn add_to_18(x: usize) -> usize {
    let mut y = x;

    unsafe {
        core::arch::asm!(
            "add {y}, [rip + {eighteen}]",
            y = inout(reg) y,
            eighteen = sym EIGHTEEN,
        );
    }

    y
}

// main.rs
fn main() {
    println!("5 + 18 = {}", my_lib::add_to_18(5));
}

I expected to see this happen: output 5 + 18 = 23

Instead, this happened:

   Compiling my_lib v0.1.0 (/home/user/my_lib)
error: linking with `clang` failed: exit status: 1
  <...omitted...>
  = note: mold: error: undefined symbol: my_lib::EIGHTEEN::he8c23468c01db196
          >>> referenced by 1551ilekjbvb99xo

What works

1. #[no_mangle]:

// lib.rs
#[no_mangle]
static EIGHTEEN: usize = 18;

#[inline(always)]
pub fn add_to_18(x: usize) -> usize {
    let mut y = x;

    unsafe {
        core::arch::asm!(
            "add {y}, [rip + {eighteen}]",
            y = inout(reg) y,
            eighteen = sym EIGHTEEN,
        );
    }

    y
}

2. #[inline(never)]:

// lib.rs
static EIGHTEEN: usize = 18;

#[inline(never)]
pub fn add_to_18(x: usize) -> usize {
    let mut y = x;

    unsafe {
        core::arch::asm!(
            "add {y}, [rip + {eighteen}]",
            y = inout(reg) y,
            eighteen = sym EIGHTEEN,
        );
    }

    y
}

3. pub static:

// lib.rs
pub static EIGHTEEN: usize = 18;

#[inline(always)]
pub fn add_to_18(x: usize) -> usize {
    let mut y = x;

    unsafe {
        core::arch::asm!(
            "add {y}, [rip + {eighteen}]",
            y = inout(reg) y,
            eighteen = sym EIGHTEEN,
        );
    }

    y
}

Meta

rustc --version --verbose:

rustc 1.67.0-nightly (a28f3c88e 2022-11-20)
binary: rustc
commit-hash: a28f3c88e50a77bc2a91889241248c4543854e61
commit-date: 2022-11-20
host: x86_64-unknown-linux-gnu
release: 1.67.0-nightly
LLVM version: 15.0.4

mold --version:

mold 1.6.0 (323ad30e25c2c81efdb07ab76601a119335a40c8; compatible with GNU ld)

Also tried with ld linker, got the same error.