ebff167966
Regression test for AVR `rjmp` offset This adds a regression test for #129301 by minimizing the code in the linked issue and putting it into a `#![no_core]`-compatible format, so that it can easily be used within an `rmake`-test. This needs to be a `rmake` test (opposed to a `tests/assembly` one), since the linked issue describes, that the problem only occurs if the code is directly compiled. Note, that `lld` is used instead of `avr-gcc`; see the [comments](https://github.com/rust-lang/rust/pull/131755#issuecomment-2416469675) [below](https://github.com/rust-lang/rust/pull/131755#issuecomment-2417160045). Closes #129301. To show, that the test actually catches the wrong behavior, this can be tested with a faulty rustc: ```bash $ rustup install nightly-2024-08-19 $ rustc +nightly-2024-08-19 -C opt-level=s -C panic=abort --target avr-unknown-gnu-atmega328 -Clinker=build/x86_64-unknown-linux-gnu/ci-llvm/bin/lld -Clink-arg='--entry=main' -o compiled tests/run-make/avr-rjmp-offset/avr-rjmp-offsets.rs $ llvm-objdump -d compiled | grep '<main>' -A 6 000110b4 <main>: 110b4: 81 e0 ldi r24, 0x1 110b6: 92 e0 ldi r25, 0x2 110b8: 85 b9 out 0x5, r24 110ba: 95 b9 out 0x5, r25 110bc: fe cf rjmp .-4 ``` One can see, that the wrong label offset (`4` instead of `6`) is produced, which would trigger an assertion in the test case. This would be a good candidate for using the `minicore` proposed in #130693. Since this is not yet merged, there is a FIXME. r? Patryk27 I think, you are the yet-to-be official target maintainer, hence I'll assign to you. `@rustbot` label +O-AVR |
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This is the main source code repository for Rust. It contains the compiler, standard library, and documentation.
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