staticlibs not supported with `cargo +nightly build -Zbuild-std --target bpfel-unknown-none --release`

[clairechingching]

Code

#![cfg_attr(target_arch = "bpf", no_std)]
#[link(name = "compiler_builtins", kind = "static")]
extern "C" {}

#[cfg(target_arch = "bpf")]
#[panic_handler]
fn panic(_: &core::panic::PanicInfo) -> ! {
    unsafe { core::hint::unreachable_unchecked() }
}

pub fn sol_log_data(data: &[&[u8]]) {
    let sol_log_data: unsafe extern "C" fn(data: *const u8, len: u64) = unsafe { core::mem::transmute(0x7317b434_usize) };
    unsafe { sol_log_data(data.as_ptr() as *const u8, data.len() as u64) }
}

// #[no_mangle]
// fn __multi3(a: u128, b: u128) -> u128 {
//     0
// }

extern "C" {
    fn __multi3(a: u128, b: u128) -> u128;
}


// #[used]
// static _KEEP_MULTI3: unsafe fn(u128, u128) -> u128 = __multi3;

#[unsafe(no_mangle)]
pub fn entrypoint(input: *mut u8) -> u64 {
    let y: u128 = unsafe { __multi3(*(input.add(0x0010) as *const u128), 0x05) };
    let x: u128 = unsafe { (*(input.add(0x0010) as *const u128)) * 0x05 };
    sol_log_data(&[x.to_le_bytes().as_ref()]);
    sol_log_data(&[y.to_le_bytes().as_ref()]);
    0
}

#[cfg(test)]
mod tests {
    use mollusk_svm::{Mollusk, result::Check};
    use solana_instruction::Instruction;

    #[test]
    pub fn hello_world() {
        let mollusk = Mollusk::new(&[2u8;32].into(), "target/bpfel-unknown-none/release/libupstream_u128_test");
        mollusk.process_and_validate_instruction(&Instruction {
            program_id: [2u8;32].into(),
            accounts: vec![],
            data: vec![0x0a, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 ]
        }, &vec![], &[
            Check::success()
        ]);
    }
}

Meta

rustc --version --verbose:

rustc 1.91.1 (ed61e7d7e 2025-11-07)
binary: rustc
commit-hash: ed61e7d7e242494fb7057f2657300d9e77bb4fcb
commit-date: 2025-11-07
host: aarch64-apple-darwin
release: 1.91.1
LLVM version: 21.1.2

Error output

thread 'rustc' panicked at compiler/rustc_codegen_ssa/src/back/linker.rs:2077:9:
staticlibs not supported
stack backtrace:
   0:        0x110a94d08 - std::backtrace::Backtrace::create::h19cedfa09f31f796
   1:        0x10eadc4a0 - std[4f80e808129b856b]::panicking::update_hook::<alloc[9ea57ca06ed6a28a]::boxed::Box<rustc_driver_impl[2dca77a83c5d10c3]::install_ice_hook::{closure#1}>>::{closure#0}
   2:        0x110a95bd0 - std::panicking::panic_with_hook::h4f9c1775cdfebc95
   3:        0x110a95878 - std::panicking::panic_handler::{{closure}}::hff2f3da0c310d131
   4:        0x110a8f2a4 - std::sys::backtrace::__rust_end_short_backtrace::h8ac6d0476adddd3e
   5:        0x110a73e24 - __rustc[5b69f54ba72bd95a]::rust_begin_unwind
   6:        0x1137fa06c - core::panicking::panic_fmt::h4af89295c468f215
   7:        0x113851ba8 - <rustc_codegen_ssa[df4a98393291ceee]::back::linker::BpfLinker as rustc_codegen_ssa[df4a98393291ceee]::back::linker::Linker>::link_staticlib_by_name
   8:        0x10e8e6ef8 - rustc_codegen_ssa[df4a98393291ceee]::back::link::add_native_libs_from_crate
   9:        0x10e8e0bbc - rustc_codegen_ssa[df4a98393291ceee]::back::link::linker_with_args
  10:        0x10e8d0604 - rustc_codegen_ssa[df4a98393291ceee]::back::link::link_natively
  11:        0x10e8cc470 - rustc_codegen_ssa[df4a98393291ceee]::back::link::link_binary
  12:        0x10f3a2750 - <rustc_interface[2f747f6d882c34ea]::queries::Linker>::link
  13:        0x10eada9dc - rustc_interface[2f747f6d882c34ea]::interface::run_compiler::<(), rustc_driver_impl[2dca77a83c5d10c3]::run_compiler::{closure#0}>::{closure#1}
  14:        0x10eace0dc - std[4f80e808129b856b]::sys::backtrace::__rust_begin_short_backtrace::<rustc_interface[2f747f6d882c34ea]::util::run_in_thread_with_globals<rustc_interface[2f747f6d882c34ea]::util::run_in_thread_pool_with_globals<rustc_interface[2f747f6d882c34ea]::interface::run_compiler<(), rustc_driver_impl[2dca77a83c5d10c3]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>
  15:        0x10eae0fa0 - <<std[4f80e808129b856b]::thread::Builder>::spawn_unchecked_<rustc_interface[2f747f6d882c34ea]::util::run_in_thread_with_globals<rustc_interface[2f747f6d882c34ea]::util::run_in_thread_pool_with_globals<rustc_interface[2f747f6d882c34ea]::interface::run_compiler<(), rustc_driver_impl[2dca77a83c5d10c3]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>::{closure#1} as core[c3559bc9615a0249]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  16:        0x110a8bf38 - std::sys::thread::unix::Thread::new::thread_start::h261e28af5627e4c5
  17:        0x188ae2c0c - __pthread_cond_wait


rustc version: 1.93.0-nightly (b6d7ff3aa 2025-11-14)
platform: aarch64-apple-darwin%

Backtrace

<backtrace>

[bjorn3]

I don't think linking against staticlibs is supposed to work given that for eBPF we don't actually emit object files, but LTO bitcode instead. But we should still give a decent error message.

By the way you shouldn't do #[link(name = "compiler_builtins", kind = "static")] on any target. compiler_builtins is a rust crate. It should be automatically linked in.