linking fails on Rust nightly-2022-10-08

[hawkw]

After updating the Rust toolchain to nightly-2022-10-08, attempting to build a kernel using the BIOS version of bootloader v0.10.13 fails with a number of linker errors similar to the following (for various symbols defined by the bootloader):

rust-lld: error: undefined symbol: _rest_of_bootloader_start_addr
          >>> referenced by bios.98c44c40-cgu.3
          >>>               /home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/bios-f9dd4f582be5a1cb.bios.98c44c40-cgu.3.rcgu.o:(.boot-first-stage+0x60)
          >>> referenced by bios.98c44c40-cgu.3
          >>>               /home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/bios-f9dd4f582be5a1cb.bios.98c44c40-cgu.3.rcgu.o:(.boot-first-stage+0x6D)
          >>> referenced by bios.98c44c40-cgu.3
          >>>               /home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/bios-f9dd4f582be5a1cb.bios.98c44c40-cgu.3.rcgu.o:(.boot-first-stage+0x89)

It seems like the rust-lld behavior has changed somehow.

It would probably be useful to determine which nightly introduced this regression, in order to pinpoint the change in linker behavior. We could do this using the cargo bisect-rustc tool, but, unfortunately, that tool doesn't work on my machine, so if someone else has the time to do a bisect run, that could be very helpful. I can offer nightly-2022-07-31 as a known-good nightly (it's the version my kernel is currently pinned to), but I imagine there's almost certainly a newer working nightly...

Steps to reproduce:

:; rustup toolchain install nightly-2022-10-09 \
    && cd examples/basic \
    && cargo +nightly-2022-10-09 kimage

Details

Complete output of cargo kimage in examples/basic kernel:

:# eliza at noctis in bootloader/examples/basic on  main [$✘?] ⚙️ v1.66.0-nightly
:; cargo +nightly-2022-10-09 kimage
   Compiling compiler_builtins v0.1.79
   Compiling core v0.0.0 (/home/eliza/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core)
   Compiling bootloader v0.10.12 (/home/eliza/Code/bootloader)
   Compiling rustc-std-workspace-core v1.99.0 (/home/eliza/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/rustc-std-workspace-core)
   Compiling basic_example v0.1.0 (/home/eliza/Code/bootloader/examples/basic)
    Finished dev [unoptimized + debuginfo] target(s) in 7.94s
     Running `cargo run --package simple_boot -- target/x86_64-custom/debug/basic_example`
   Compiling json v0.12.4
   Compiling bootloader-locator v0.0.4
   Compiling locate-cargo-manifest v0.2.2
   Compiling simple_boot v0.1.0 (/home/eliza/Code/bootloader/examples/basic/simple_boot)
    Finished dev [unoptimized + debuginfo] target(s) in 0.65s
     Running `target/debug/simple_boot target/x86_64-custom/debug/basic_example`
error: linking with `rust-lld` failed: exit status: 1
  |
  = note: "rust-lld" "-flavor" "gnu" "/run/user/1000/rustcMXO3Et/symbols.o" "/home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/bios-f9dd4f582be5a1cb.bios.98c44c40-cgu.0.rcgu.o" "/home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/bios-f9dd4f582be5a1cb.bios.98c44c40-cgu.1.rcgu.o" "/home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/bios-f9dd4f582be5a1cb.bios.98c44c40-cgu.10.rcgu.o" "/home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/bios-f9dd4f582be5a1cb.bios.98c44c40-cgu.11.rcgu.o" "/home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/bios-f9dd4f582be5a1cb.bios.98c44c40-cgu.12.rcgu.o" "/home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/bios-f9dd4f582be5a1cb.bios.98c44c40-cgu.13.rcgu.o" "/home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/bios-f9dd4f582be5a1cb.bios.98c44c40-cgu.14.rcgu.o" "/home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/bios-f9dd4f582be5a1cb.bios.98c44c40-cgu.15.rcgu.o" "/home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/bios-f9dd4f582be5a1cb.bios.98c44c40-cgu.2.rcgu.o" "/home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/bios-f9dd4f582be5a1cb.bios.98c44c40-cgu.3.rcgu.o" "/home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/bios-f9dd4f582be5a1cb.bios.98c44c40-cgu.4.rcgu.o" "/home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/bios-f9dd4f582be5a1cb.bios.98c44c40-cgu.5.rcgu.o" "/home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/bios-f9dd4f582be5a1cb.bios.98c44c40-cgu.6.rcgu.o" "/home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/bios-f9dd4f582be5a1cb.bios.98c44c40-cgu.7.rcgu.o" "/home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/bios-f9dd4f582be5a1cb.bios.98c44c40-cgu.8.rcgu.o" "/home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/bios-f9dd4f582be5a1cb.bios.98c44c40-cgu.9.rcgu.o" "--as-needed" "-L" "/home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps" "-L" "/home/eliza/Code/bootloader/examples/basic/target/release/deps" "-L" "/home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/build/bootloader-1e7d0531e3e8bfcb/out" "-L" "/home/eliza/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-bootloader/lib" "-Bstatic" "/home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/librsdp-f0994b510951e1cc.rlib" "/home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/libbootloader-72e232d9fbdb1766.rlib" "/home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/liblog-edef54c6f00d1854.rlib" "/home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/libcfg_if-5d3e665bb59dc616.rlib" "/home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/libspinning_top-ed2aa1630c31090d.rlib" "/home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/liblock_api-e44b8cbd42f4efd0.rlib" "/home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/libscopeguard-f52e6e2592823134.rlib" "/home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/libnoto_sans_mono_bitmap-d9ee7d27604ff308.rlib" "/home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/libconquer_once-9c405c840f71c06b.rlib" "/home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/libxmas_elf-8c1144fae3f3a670.rlib" "/home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/libzero-c586f84297d25602.rlib" "/home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/librand-400a474582969ba9.rlib" "/home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/libraw_cpuid-db447fdebf7b5197.rlib" "/home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/librand_chacha-04264d589c30f845.rlib" "/home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/libppv_lite86-37cedba29a39dd97.rlib" "/home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/librand_core-fb604127c04776b0.rlib" "/home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/libx86_64-19c2b6e654c165ce.rlib" "/home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/libvolatile-d4f8663cc983ac90.rlib" "/home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/libbitflags-877a0c77899c9e76.rlib" "/home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/libbit_field-cc8cdf0c0596fe6e.rlib" "/home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/libusize_conversions-d85a04799a0c7be3.rlib" "/home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/librustc_std_workspace_core-b8a2fd09bcb24600.rlib" "/home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/libcore-47af85afbcb706fe.rlib" "/home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/libcompiler_builtins-1d57e3c7f4a6f9fd.rlib" "-Bdynamic" "--eh-frame-hdr" "-znoexecstack" "-L" "/home/eliza/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-bootloader/lib" "-o" "/home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/bios-f9dd4f582be5a1cb" "--gc-sections"
  = note: rust-lld: error: undefined symbol: _rest_of_bootloader_start_addr
          >>> referenced by bios.98c44c40-cgu.3
          >>>               /home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/bios-f9dd4f582be5a1cb.bios.98c44c40-cgu.3.rcgu.o:(.boot-first-stage+0x60)
          >>> referenced by bios.98c44c40-cgu.3
          >>>               /home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/bios-f9dd4f582be5a1cb.bios.98c44c40-cgu.3.rcgu.o:(.boot-first-stage+0x6D)
          >>> referenced by bios.98c44c40-cgu.3
          >>>               /home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/bios-f9dd4f582be5a1cb.bios.98c44c40-cgu.3.rcgu.o:(.boot-first-stage+0x89)

          rust-lld: error: undefined symbol: _rest_of_bootloader_end_addr
          >>> referenced by bios.98c44c40-cgu.3
          >>>               /home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/bios-f9dd4f582be5a1cb.bios.98c44c40-cgu.3.rcgu.o:(.boot-first-stage+0x92)

          rust-lld: error: undefined symbol: _kernel_buffer
          >>> referenced by bios.98c44c40-cgu.3
          >>>               /home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/bios-f9dd4f582be5a1cb.bios.98c44c40-cgu.3.rcgu.o:(.boot+0x59)

          rust-lld: error: undefined symbol: _memory_map
          >>> referenced by bios.98c44c40-cgu.3
          >>>               /home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/bios-f9dd4f582be5a1cb.bios.98c44c40-cgu.3.rcgu.o:(.boot+0xCA)
          >>> referenced by lib.rs:230 (/home/eliza/.cargo/registry/src/github.com-1ecc6299db9ec823/bit_field-0.10.1/src/lib.rs:230)
          >>>               /home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/bios-f9dd4f582be5a1cb.bios.98c44c40-cgu.3.rcgu.o:(x86_64::addr::VirtAddr::new::h1cdf102f8e2a4251)
          >>> referenced by lib.rs:230 (/home/eliza/.cargo/registry/src/github.com-1ecc6299db9ec823/bit_field-0.10.1/src/lib.rs:230)
          >>>               /home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/bios-f9dd4f582be5a1cb.bios.98c44c40-cgu.3.rcgu.o:(x86_64::addr::VirtAddr::new::h1cdf102f8e2a4251)
          >>> referenced 2 more times

          rust-lld: error: undefined symbol: __page_table_start
          >>> referenced by bios.98c44c40-cgu.3
          >>>               /home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/bios-f9dd4f582be5a1cb.bios.98c44c40-cgu.3.rcgu.o:(.boot+0x784)

          rust-lld: error: undefined symbol: __page_table_end
          >>> referenced by bios.98c44c40-cgu.3
          >>>               /home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/bios-f9dd4f582be5a1cb.bios.98c44c40-cgu.3.rcgu.o:(.boot+0x789)

          rust-lld: error: undefined symbol: _p3
          >>> referenced by bios.98c44c40-cgu.3
          >>>               /home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/bios-f9dd4f582be5a1cb.bios.98c44c40-cgu.3.rcgu.o:(.boot+0x797)
          >>> referenced by bios.98c44c40-cgu.3
          >>>               /home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/bios-f9dd4f582be5a1cb.bios.98c44c40-cgu.3.rcgu.o:(.boot+0x7AC)

          rust-lld: error: undefined symbol: _p4
          >>> referenced by bios.98c44c40-cgu.3
          >>>               /home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/bios-f9dd4f582be5a1cb.bios.98c44c40-cgu.3.rcgu.o:(.boot+0x79F)
          >>> referenced by bios.98c44c40-cgu.3
          >>>               /home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/bios-f9dd4f582be5a1cb.bios.98c44c40-cgu.3.rcgu.o:(.boot+0x7D7)

          rust-lld: error: undefined symbol: _p2
          >>> referenced by bios.98c44c40-cgu.3
          >>>               /home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/bios-f9dd4f582be5a1cb.bios.98c44c40-cgu.3.rcgu.o:(.boot+0x7A4)
          >>> referenced by bios.98c44c40-cgu.3
          >>>               /home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/bios-f9dd4f582be5a1cb.bios.98c44c40-cgu.3.rcgu.o:(.boot+0x7BD)


error: could not compile `bootloader` due to previous error
thread 'main' panicked at 'assertion failed: cmd.status()?.success()', src/bin/builder.rs:182:9
stack backtrace:
   0: rust_begin_unwind
             at /rustc/8796e7a9cfd4c5c4f1de15ec1c53994ddf288665/library/std/src/panicking.rs:556:5
   1: core::panicking::panic_fmt
             at /rustc/8796e7a9cfd4c5c4f1de15ec1c53994ddf288665/library/core/src/panicking.rs:142:14
   2: core::panicking::panic
             at /rustc/8796e7a9cfd4c5c4f1de15ec1c53994ddf288665/library/core/src/panicking.rs:48:5
   3: builder::main
             at ./src/bin/builder.rs:182:9
   4: core::ops::function::FnOnce::call_once
             at /rustc/8796e7a9cfd4c5c4f1de15ec1c53994ddf288665/library/core/src/ops/function.rs:251:5
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
thread 'main' panicked at 'build failed', simple_boot/src/main.rs:63:9
stack backtrace:
   0: std::panicking::begin_panic
             at /rustc/8796e7a9cfd4c5c4f1de15ec1c53994ddf288665/library/std/src/panicking.rs:588:12
   1: simple_boot::create_disk_images
             at ./simple_boot/src/main.rs:63:9
   2: simple_boot::main
             at ./simple_boot/src/main.rs:24:16
   3: core::ops::function::FnOnce::call_once
             at /rustc/8796e7a9cfd4c5c4f1de15ec1c53994ddf288665/library/core/src/ops/function.rs:251:5
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

rustc --version output:

:# eliza at noctis in bootloader/examples/basic on  main [$✘?] ⚙️ v1.66.0-nightly
:; rustc --version
rustc 1.66.0-nightly (8796e7a9c 2022-10-08)

[clstatham]

This has been driving me insane all day. I don't remember why, but something prompted me to update my nightly installation of Rust for my OS project this morning and after I did so my project stopped linking properly, even though it was working fine last night. I can provide that nightly-2022-10-07 is likely the most recent working version. I just tested it myself and everything built fine! :)

[hawkw]

Taking a closer look at the output, I notice that it looks like the command line for rust-lld was the following (newlines added for clarity):

"rust-lld" \
    "-flavor" "gnu" \
    "/run/user/1000/rustcMXO3Et/symbols.o" \
    "/home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/bios-f9dd4f582be5a1cb.bios.98c44c40-cgu.0.rcgu.o" \
     "/home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/bios-f9dd4f582be5a1cb.bios.98c44c40-cgu.1.rcgu.o" \
     "/home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/bios-f9dd4f582be5a1cb.bios.98c44c40-cgu.10.rcgu.o" \
     "/home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/bios-f9dd4f582be5a1cb.bios.98c44c40-cgu.11.rcgu.o" \
     "/home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/bios-f9dd4f582be5a1cb.bios.98c44c40-cgu.12.rcgu.o" \
     "/home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/bios-f9dd4f582be5a1cb.bios.98c44c40-cgu.13.rcgu.o" \
     "/home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/bios-f9dd4f582be5a1cb.bios.98c44c40-cgu.14.rcgu.o" \
     "/home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/bios-f9dd4f582be5a1cb.bios.98c44c40-cgu.15.rcgu.o" \
     "/home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/bios-f9dd4f582be5a1cb.bios.98c44c40-cgu.2.rcgu.o" \
     "/home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/bios-f9dd4f582be5a1cb.bios.98c44c40-cgu.3.rcgu.o" \
     "/home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/bios-f9dd4f582be5a1cb.bios.98c44c40-cgu.4.rcgu.o" \
     "/home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/bios-f9dd4f582be5a1cb.bios.98c44c40-cgu.5.rcgu.o" \
     "/home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/bios-f9dd4f582be5a1cb.bios.98c44c40-cgu.6.rcgu.o" \
     "/home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/bios-f9dd4f582be5a1cb.bios.98c44c40-cgu.7.rcgu.o" \
     "/home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/bios-f9dd4f582be5a1cb.bios.98c44c40-cgu.8.rcgu.o" \
     "/home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/bios-f9dd4f582be5a1cb.bios.98c44c40-cgu.9.rcgu.o" \
     "--as-needed" \
     "-L" "/home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps" \
     "-L" "/home/eliza/Code/bootloader/examples/basic/target/release/deps" \
     "-L" "/home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/build/bootloader-1e7d0531e3e8bfcb/out" \
     "-L" "/home/eliza/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-bootloader/lib" \
     "-Bstatic" "/home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/librsdp-f0994b510951e1cc.rlib" \
     "/home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/libbootloader-72e232d9fbdb1766.rlib" \
     "/home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/liblog-edef54c6f00d1854.rlib" \
     "/home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/libcfg_if-5d3e665bb59dc616.rlib" \
     "/home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/libspinning_top-ed2aa1630c31090d.rlib" \
     "/home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/liblock_api-e44b8cbd42f4efd0.rlib" \
     "/home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/libscopeguard-f52e6e2592823134.rlib" \
     "/home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/libnoto_sans_mono_bitmap-d9ee7d27604ff308.rlib" \
     "/home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/libconquer_once-9c405c840f71c06b.rlib" \
     "/home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/libxmas_elf-8c1144fae3f3a670.rlib" \
     "/home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/libzero-c586f84297d25602.rlib" \
     "/home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/librand-400a474582969ba9.rlib" \
     "/home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/libraw_cpuid-db447fdebf7b5197.rlib" \
     "/home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/librand_chacha-04264d589c30f845.rlib" \
     "/home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/libppv_lite86-37cedba29a39dd97.rlib" \
     "/home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/librand_core-fb604127c04776b0.rlib" \
     "/home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/libx86_64-19c2b6e654c165ce.rlib" \
     "/home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/libvolatile-d4f8663cc983ac90.rlib" \
     "/home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/libbitflags-877a0c77899c9e76.rlib" \
     "/home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/libbit_field-cc8cdf0c0596fe6e.rlib" \
     "/home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/libusize_conversions-d85a04799a0c7be3.rlib" \
     "/home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/librustc_std_workspace_core-b8a2fd09bcb24600.rlib" \
     "/home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/libcore-47af85afbcb706fe.rlib" \
     "/home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/libcompiler_builtins-1d57e3c7f4a6f9fd.rlib" \
     "-Bdynamic" \
     "--eh-frame-hdr" \
     "-znoexecstack" \
     "-L" "/home/eliza/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-bootloader/lib" \
     "-o" "/home/eliza/Code/bootloader/examples/basic/target/x86_64-bootloader/release/deps/bios-f9dd4f582be5a1cb" \
     "--gc-sections"

Critically, the linker command does not appear to contain the --script=linker.ld flag specified in the x86_64-bootloader.json targetfile.

If the linker was not passed the correct linker script, that would explain why these symbols are missing, as they're generated by the linker script. I wonder if something changed in how Rust determines linker arguments after nightly-2022-10-07?

[hawkw]

Ahh, looking at the Rust issue tracker, I found PR rust-lang/rust#102836, which fixes a regression that broke the parsing of pre-link-args in custom targets: rust-lang/rust#101988 (comment). I bet that's our problem!

[hawkw]

Hopefully this will be fixed upstream soon! In the meantime, I don't think there's anything bootloader can do about it besides advise pinning to nightly-2022-10-07 or earlier.

[phil-opp]

Thanks a lot for reporting and debugging this! Looks like it will be fixed by rust-lang/rust#102836. Until then, using an older nightly is probably the best workaround.

[phil-opp]

The latest nightly should fix this.