LLVM ERROR: Not supported instr

[sobolevn]

I am using this example: https://github.com/Rahix/avr-hal/tree/d17a441a667dd65e5a9be75b0e71d1beadf93e84/boards/arduino-uno

I have also executed rustup component add rust-src

And it fails to compile with this error:

» cargo +nightly build --example uno-blink
   Compiling compiler_builtins v0.1.39
   Compiling nb v1.0.0
   Compiling cfg-if v0.1.10
   Compiling bare-metal v0.2.5
   Compiling void v1.0.2
   Compiling vcell v0.1.3
   Compiling ufmt-write v0.1.0 (https://github.com/Rahix/ufmt.git?rev=12225dc1678e42fecb0e8635bf80f501e24817d9#12225dc1)
   Compiling panic-halt v0.2.0
   Compiling nb v0.1.3
   Compiling avr-device v0.2.3
   Compiling ufmt v0.1.0 (https://github.com/Rahix/ufmt.git?rev=12225dc1678e42fecb0e8635bf80f501e24817d9#12225dc1)
   Compiling embedded-hal v0.2.4
LLVM ERROR: Not supported instr: <MCInst 258 <MCOperand Reg:1> <MCOperand Imm:15> <MCOperand Reg:40>>
error: could not compile `compiler_builtins`

To learn more, run the command again with --verbose.
warning: build failed, waiting for other jobs to finish...
error: build failed

My versions:

• rust

» rustup --version
rustup 1.23.1 (2020-12-03)
info: This is the version for the rustup toolchain manager, not the rustc compiler.
info: The currently active `rustc` version is `rustc 1.51.0-nightly (c8915eebe 2021-01-07)`

• avr

» avr-gcc --version
avr-gcc (Homebrew AVR GCC 9.3.0) 9.3.0
Copyright (C) 2019 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

• And macos 10.14

[lights0123]

Try --release?

[sobolevn]

It is a bit different, but still the same 🙂

» cargo +nightly build --example uno-blink --release 
   Compiling compiler_builtins v0.1.39
   Compiling core v0.0.0 (/Users/sobolev/.rustup/toolchains/nightly-x86_64-apple-darwin/lib/rustlib/src/rust/library/core)
   Compiling proc-macro2 v1.0.24
   Compiling unicode-xid v0.2.1
   Compiling syn v1.0.58
   Compiling semver-parser v0.7.0
   Compiling proc-macro-hack v0.5.19
   Compiling paste v1.0.4
   Compiling semver v0.9.0
   Compiling rustc_version v0.2.3
   Compiling quote v1.0.8
   Compiling bare-metal v0.2.5
   Compiling rustc-std-workspace-core v1.99.0 (/Users/sobolev/.rustup/toolchains/nightly-x86_64-apple-darwin/lib/rustlib/src/rust/library/rustc-std-workspace-core)
   Compiling avr-device-macros v0.2.3
   Compiling ufmt-macros v0.1.1 (https://github.com/Rahix/ufmt.git?rev=12225dc1678e42fecb0e8635bf80f501e24817d9#12225dc1)
   Compiling nb v1.0.0
   Compiling ufmt-write v0.1.0 (https://github.com/Rahix/ufmt.git?rev=12225dc1678e42fecb0e8635bf80f501e24817d9#12225dc1)
   Compiling void v1.0.2
   Compiling vcell v0.1.3
   Compiling cfg-if v0.1.10
   Compiling panic-halt v0.2.0
   Compiling nb v0.1.3
   Compiling avr-device v0.2.3
   Compiling embedded-hal v0.2.4
LLVM ERROR: Not supported instr: <MCInst 258 <MCOperand Reg:1> <MCOperand Imm:15> <MCOperand Reg:40>>
error: could not compile `compiler_builtins`

To learn more, run the command again with --verbose.
warning: build failed, waiting for other jobs to finish...
error: build failed

With --verbose:

   Compiling embedded-hal v0.2.4
     Running `rustc --crate-name embedded_hal /Users/sobolev/.cargo/registry/src/github.com-1ecc6299db9ec823/embedded-hal-0.2.4/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts --crate-type lib --emit=dep-info,metadata,link -C opt-level=s -C panic=abort -C linker-plugin-lto -C codegen-units=1 -C debuginfo=2 --cfg 'feature="unproven"' -C metadata=503a59343e486e01 -C extra-filename=-503a59343e486e01 --out-dir /Users/sobolev/Desktop/avr-hal/target/avr-atmega328p/release/deps --target /Users/sobolev/Desktop/avr-hal/avr-specs/avr-atmega328p.json -L dependency=/Users/sobolev/Desktop/avr-hal/target/avr-atmega328p/release/deps -L dependency=/Users/sobolev/Desktop/avr-hal/target/release/deps --extern 'noprelude:compiler_builtins=/Users/sobolev/Desktop/avr-hal/target/avr-atmega328p/release/deps/libcompiler_builtins-afa03ed941a63b4f.rmeta' --extern 'noprelude:core=/Users/sobolev/Desktop/avr-hal/target/avr-atmega328p/release/deps/libcore-30308749cc1695e3.rmeta' --extern nb=/Users/sobolev/Desktop/avr-hal/target/avr-atmega328p/release/deps/libnb-e03ff2173c96de6e.rmeta --extern void=/Users/sobolev/Desktop/avr-hal/target/avr-atmega328p/release/deps/libvoid-4cf9d65885018701.rmeta -Z unstable-options --cap-lints allow`
LLVM ERROR: Not supported instr: <MCInst 258 <MCOperand Reg:1> <MCOperand Imm:15> <MCOperand Reg:40>>
error: could not compile `compiler_builtins`

Caused by:
  process didn't exit successfully: `rustc --crate-name compiler_builtins /Users/sobolev/.cargo/registry/src/github.com-1ecc6299db9ec823/compiler_builtins-0.1.39/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts --crate-type lib --emit=dep-info,metadata,link -C opt-level=s -C panic=abort -C linker-plugin-lto -C codegen-units=1 -C debuginfo=2 --cfg 'feature="compiler-builtins"' --cfg 'feature="core"' --cfg 'feature="default"' --cfg 'feature="rustc-dep-of-std"' -C metadata=afa03ed941a63b4f -C extra-filename=-afa03ed941a63b4f --out-dir /Users/sobolev/Desktop/avr-hal/target/avr-atmega328p/release/deps --target /Users/sobolev/Desktop/avr-hal/avr-specs/avr-atmega328p.json -Z force-unstable-if-unmarked -L dependency=/Users/sobolev/Desktop/avr-hal/target/avr-atmega328p/release/deps -L dependency=/Users/sobolev/Desktop/avr-hal/target/release/deps --extern core=/Users/sobolev/Desktop/avr-hal/target/avr-atmega328p/release/deps/librustc_std_workspace_core-2709fdbb3f7a5de3.rmeta --cap-lints allow --cfg 'feature="unstable"'` (exit code: 101)
warning: build failed, waiting for other jobs to finish...
error: build failed

I have also tried a clean build with:

• reinstalled rust and rustup
• reinstalled rust-std

Still the same.

[sobolevn]

I have made a reproduction:

FROM rustlang/rust:nightly-slim

RUN apt-get update \
  && apt-get install --no-install-recommends -y \
    avr-libc \
    binutils-avr \
    gcc-avr \
  && apt-get purge -y --auto-remove -o APT::AutoRemove::RecommendsImportant=false \
  && apt-get clean -y && rm -rf /var/lib/apt/lists/*

COPY . /code

WORKDIR /code/boards/arduino-uno

RUN rustup component add rust-src
RUN cargo +nightly build --example uno-blink

Steps:
0. Add this Dockerfile in the root of the project
0,5. Ignore or delete any target/ dirs

1. Run docker build --tag=ard .

This is the output:

Step 6/6 : RUN cargo +nightly build --example uno-blink
 ---> Running in fde0189b88d8
    Updating git repository `https://github.com/Rahix/ufmt.git`
    Updating crates.io index
 Downloading crates ...
  Downloaded nb v0.1.3
  Downloaded paste v1.0.4
  Downloaded rustc_version v0.2.3
  Downloaded semver-parser v0.7.0
  Downloaded quote v1.0.8
  Downloaded proc-macro2 v1.0.24
  Downloaded proc-macro-hack v0.5.19
  Downloaded vcell v0.1.3
  Downloaded void v1.0.2
  Downloaded cfg-if v0.1.10
  Downloaded unicode-xid v0.2.1
  Downloaded syn v1.0.58
  Downloaded avr-device-macros v0.2.3
  Downloaded avr-device v0.2.3
  Downloaded semver v0.9.0
  Downloaded panic-halt v0.2.0
  Downloaded nb v1.0.0
  Downloaded embedded-hal v0.2.4
  Downloaded bare-metal v0.2.5
 Downloading crates ...
  Downloaded cc v1.0.60
  Downloaded compiler_builtins v0.1.39
  Downloaded getopts v0.2.21
  Downloaded hashbrown v0.9.0
  Downloaded addr2line v0.14.0
  Downloaded gimli v0.23.0
  Downloaded miniz_oxide v0.4.0
  Downloaded adler v0.2.3
  Downloaded object v0.22.0
  Downloaded unicode-width v0.1.8
  Downloaded rustc-demangle v0.1.18
  Downloaded libc v0.2.79
   Compiling compiler_builtins v0.1.39
   Compiling core v0.0.0 (/usr/local/rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core)
   Compiling proc-macro2 v1.0.24
   Compiling unicode-xid v0.2.1
   Compiling syn v1.0.58
   Compiling semver-parser v0.7.0
   Compiling proc-macro-hack v0.5.19
   Compiling paste v1.0.4
   Compiling semver v0.9.0
   Compiling rustc_version v0.2.3
   Compiling quote v1.0.8
   Compiling bare-metal v0.2.5
   Compiling rustc-std-workspace-core v1.99.0 (/usr/local/rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/rustc-std-workspace-core)
LLVM ERROR: Not supported instr: <MCInst 258 <MCOperand Reg:1> <MCOperand Imm:15> <MCOperand Reg:40>>
error: could not compile `compiler_builtins`

To learn more, run the command again with --verbose.
warning: build failed, waiting for other jobs to finish...
error: build failed
The command '/bin/sh -c cargo +nightly build --example uno-blink' returned a non-zero code: 101

[lights0123]

Regression in nightly-2021-01-08, rust version 1.51.0-nightly (c8915eebe 2021-01-07), should probably file a compiler-builtins bug. Diff, probably because the last 4 months of changes in compiler-builtins were used.

[Rahix]

We have identified the problem, let's see how it will be solved. In the meantime, for anyone stumbling upon this issue: Just use an older toolchain like nightly-2021-01-07 for now. With rustup, installing and using it will be as easy as:

rustup toolchain install nightly-2021-01-07
# ...
cargo +nightly-2021-01-07 build

[Urhengulas]

Thank you for the workaround!
Is there a way to support you in fixing it?

[ewpratten]

For anyone that needs this information:

Rust nightly-2020-11-20 is the last version that was built that both doesn't have this issue, and had a successful rls build.

So, if you are (for example) looking for a release where you can work with avr-hal and have VSCode give you useful autocomplete and highlighting, 2020-11-20 is the version to use.

Sources: toolsuite build info and rustdatehash

[sobolevn]

One more solution to rls problem (2021-01-07 does not have rls component): rls can be replaced with https://github.com/rust-analyzer/rust-analyzer

[mike-kfed]

I found it's easiest to create a file called rust-toolchain in your projects directory with following content

[toolchain]
channel = "nightly-2021-01-07"
components = ["rust-src"]

afterwards you can simply run cargo build and all is fine :)