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Issues: rust-lang/rust

Draft release notes for 1.88.0
#141598 opened May 26, 2025 by Mark-Simulacrum
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Issues list

Many new wasm features are enabled if compile wasm32v1-none with -C linker-plugin-lto flag on LLVM 20+ A-linkers Area: linkers... you gotta love linkers A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. A-LTO Area: Link-time optimization (LTO) C-bug Category: This is a bug. E-needs-mcve Call for participation: This issue has a repro, but needs a Minimal Complete and Verifiable Example O-wasm Target: WASM (WebAssembly), http://webassembly.org/ T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#140174 opened Apr 22, 2025 by StackOverflowExcept1on
3
[RISCV] Code model other than medium does not work with lto A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. A-LTO Area: Link-time optimization (LTO) C-bug Category: This is a bug. O-riscv Target: RISC-V architecture P-low Low priority regression-from-stable-to-stable Performance or correctness regression from one stable version to another. S-has-mcve Status: A Minimal Complete and Verifiable Example has been found for this issue
#139479 opened Apr 7, 2025 by kxxt
12
Failure to link rust dependency with LTO-enabled C FFI code built with GCC A-FFI Area: Foreign function interface (FFI) A-linkage Area: linking into static, shared libraries and binaries A-LTO Area: Link-time optimization (LTO) C-bug Category: This is a bug. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#138681 opened Mar 19, 2025 by glandium
--emit obj with --crate-type staticlib doesn't work when -C lto=thin is set A-CLI Area: Command-line interface (CLI) to the compiler A-LTO Area: Link-time optimization (LTO) C-bug Category: This is a bug. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#134998 opened Jan 1, 2025 by ChrisDenton
2
Adding lto = true causes duplicated symbol errors on .weak symbols A-inline-assembly Area: Inline assembly (`asm!(…)`) A-linkage Area: linking into static, shared libraries and binaries A-LTO Area: Link-time optimization (LTO) C-bug Category: This is a bug. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#133974 opened Dec 6, 2024 by rslawson
1
Rustc fails to compile a program with ThinLTO and split-debuginfo = "packed" A-codegen Area: Code generation A-debuginfo Area: Debugging information in compiled programs (DWARF, PDB, etc.) A-LTO Area: Link-time optimization (LTO) C-bug Category: This is a bug. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#132677 opened Nov 6, 2024 by zamazan4ik
7
assembler label '' cannot be undefined on Windows ARM A-codegen Area: Code generation A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. A-LTO Area: Link-time optimization (LTO) C-bug Category: This is a bug. E-needs-mcve Call for participation: This issue has a repro, but needs a Minimal Complete and Verifiable Example I-miscompile Issue: Correct Rust code lowers to incorrect machine code O-AArch64 Armv8-A or later processors in AArch64 mode O-windows Operating system: Windows T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#132287 opened Oct 28, 2024 by NicholasLYang
3
Build failure when using LTO with static linking A-linkage Area: linking into static, shared libraries and binaries A-LTO Area: Link-time optimization (LTO) C-bug Category: This is a bug. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#129888 opened Sep 2, 2024 by burtonageo
2
Overriding LTO option in global config.toml release profile causes bootstrap failure A-contributor-roadblock Area: Makes things more difficult for new or seasoned contributors to Rust A-LTO Area: Link-time optimization (LTO) O-windows-msvc Toolchain: MSVC, Operating system: Windows T-bootstrap Relevant to the bootstrap subteam: Rust's build system (x.py and src/bootstrap)
#126141 opened Jun 7, 2024 by RossSmyth
4
rust-1.75.0 fails to compile with ICE on aarch64 and various ppc arches with LTO enabled - error: could not compile memchr A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. A-LTO Area: Link-time optimization (LTO) C-bug Category: This is a bug. E-needs-investigation Call for partcipation: This issues needs some investigation to determine current status E-needs-mcve Call for participation: This issue has a repro, but needs a Minimal Complete and Verifiable Example I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ I-unsound Issue: A soundness hole (worst kind of bug), see: https://en.wikipedia.org/wiki/Soundness O-AArch64 Armv8-A or later processors in AArch64 mode O-PowerPC Target: PowerPC processors P-high High priority regression-from-stable-to-stable Performance or correctness regression from one stable version to another. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#121124 opened Feb 15, 2024 by bowlofeggs
12
Codegen transformation of weak symbol to undefined across CGUs affects linking semantics A-code-coverage Area: Source-based code coverage (-Cinstrument-coverage) A-codegen Area: Code generation A-linkage Area: linking into static, shared libraries and binaries A-LTO Area: Link-time optimization (LTO) C-bug Category: This is a bug.
#120842 opened Feb 9, 2024 by zmodem
6
Cross language LTO broken for crates with build.rs A-LTO Area: Link-time optimization (LTO) C-bug Category: This is a bug. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#115640 opened Sep 7, 2023 by dragostis
1
ICE: assertion failed: ptr::eq(context.tcx.gcx as *const _ as *const (), tcx.gcx as *const _ as *const ()), compiler/rustc_middle/src/ty/context/tls.rs A-LTO Area: Link-time optimization (LTO) C-bug Category: This is a bug. I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ S-needs-repro Status: This issue has no reproduction and needs a reproduction to make progress. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#110564 opened Apr 19, 2023 by Nashenas88
9
-Zdylib-lto with ThinLTO is broken on windows-msvc A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. A-LTO Area: Link-time optimization (LTO) I-miscompile Issue: Correct Rust code lowers to incorrect machine code I-unsound Issue: A soundness hole (worst kind of bug), see: https://en.wikipedia.org/wiki/Soundness O-windows-msvc Toolchain: MSVC, Operating system: Windows P-high High priority requires-nightly This issue requires a nightly compiler in some way. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. WG-llvm Working group: LLVM backend code generation
#109114 opened Mar 14, 2023 by Noratrieb
12
AVR: miscompilation, or stack overflow, when running cryptographic code A-codegen Area: Code generation A-LTO Area: Link-time optimization (LTO) C-bug Category: This is a bug. I-miscompile Issue: Correct Rust code lowers to incorrect machine code I-unsound Issue: A soundness hole (worst kind of bug), see: https://en.wikipedia.org/wiki/Soundness O-AVR Target: AVR processors (ATtiny, ATmega, etc.) P-low Low priority T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#109000 opened Mar 10, 2023 by xphoniex
34
Inlined function duplication across complex branches when extern "Rust" is used with LTO and opt-level="s" A-LTO Area: Link-time optimization (LTO) C-optimization Category: An issue highlighting optimization opportunities or PRs implementing such I-heavy Issue: Problems and improvements with respect to binary size of generated code. O-Arm Target: 32-bit Arm processors (armv6, armv7, thumb...), including 64-bit Arm in AArch32 state O-msp430 T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#102295 opened Sep 26, 2022 by cr1901
Binary crashes when statically linked with LTO turned on A-LTO Area: Link-time optimization (LTO) O-linux Operating system: Linux regression-from-stable-to-stable Performance or correctness regression from one stable version to another. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#94564 opened Mar 3, 2022 by elast0ny
1
@pnkfelix
24
When trying to use cross language LTO on windows for the MSVC target, proc macros give a linker error without an explicit target A-diagnostics Area: Messages for errors, warnings, and lints A-LTO Area: Link-time optimization (LTO) A-proc-macros Area: Procedural macros C-bug Category: This is a bug. O-windows Operating system: Windows T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#92133 opened Dec 20, 2021 by nico-abram
1
Static Library with LTO option not working properly A-LTO Area: Link-time optimization (LTO)
#91624 opened Dec 7, 2021 by sijupunnnoose
2
staticlib + sancov + full LTO fails with 1.56 A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. A-LTO Area: Link-time optimization (LTO) C-bug Category: This is a bug. P-medium Medium priority regression-from-stable-to-stable Performance or correctness regression from one stable version to another. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#90300 opened Oct 26, 2021 by glandium
5
LLVM ERROR: Do not know how to split the result of this operator! A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. A-LTO Area: Link-time optimization (LTO) C-bug Category: This is a bug. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#90088 opened Oct 20, 2021 by glandium
5
Rust does not perform cross language LTO for C functions forwarding to C++ A-LTO Area: Link-time optimization (LTO) C-bug Category: This is a bug. S-needs-repro Status: This issue has no reproduction and needs a reproduction to make progress.
#86745 opened Jun 30, 2021 by Time0o
2
Regression: undefined symbol __atomic_load_4 on risvc32imac-unknown-none-elf A-atomic Area: Atomics, barriers, and sync primitives A-LTO Area: Link-time optimization (LTO) C-bug Category: This is a bug. O-riscv Target: RISC-V architecture P-medium Medium priority regression-from-stable-to-stable Performance or correctness regression from one stable version to another. T-libs Relevant to the library team, which will review and decide on the PR/issue.
#85736 opened May 27, 2021 by xobs
10
Building in release mode with LTO breaks RPM build process for some code A-linkage Area: linking into static, shared libraries and binaries A-LTO Area: Link-time optimization (LTO) C-bug Category: This is a bug. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#78445 opened Oct 27, 2020 by gavrie
1
Empty drop() causes cross-language LTO LLVM segfault A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. A-LTO Area: Link-time optimization (LTO) C-bug Category: This is a bug. I-crash Issue: The compiler crashes (SIGSEGV, SIGABRT, etc). Use I-ICE instead when the compiler panics. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#74755 opened Jul 25, 2020 by TheBlueMatt
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