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Can't use fn() for C binding if C uses sentinel value

A-FFIArea: Foreign function interface (FFI)Area: Foreign function interface (FFI)

C-discussionCategory: Discussion or questions that doesn't represent real issues.Category: Discussion or questions that doesn't represent real issues.

T-opsemRelevant to the opsem teamRelevant to the opsem team

Status: Open.

#141660 In rust-lang/rust;

· karolherbst opened on May 27, 2025

Failure to link rust dependency with LTO-enabled C FFI code built with GCC

A-FFIArea: Foreign function interface (FFI)Area: Foreign function interface (FFI)

A-linkageArea: linking into static, shared libraries and binariesArea: linking into static, shared libraries and binaries

A-LTOArea: Link-time optimization (LTO)Area: Link-time optimization (LTO)

C-bugCategory: This is a bug.Category: This is a bug.

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.

Status: Open.

#138681 In rust-lang/rust;

· glandium opened on Mar 19, 2025

CString being noalias is a footgun

A-boxArea: Our favorite opsem complicationArea: Our favorite opsem complication

A-FFIArea: Foreign function interface (FFI)Area: Foreign function interface (FFI)

C-bugCategory: This is a bug.Category: This is a bug.

T-langRelevant to the language teamRelevant to the language team

T-libs-apiRelevant to the library API team, which will review and decide on the PR/issue.Relevant to the library API team, which will review and decide on the PR/issue.

T-opsemRelevant to the opsem teamRelevant to the opsem team

Status: Open.

#136770 In rust-lang/rust;

· theemathas opened on Feb 9, 2025

Add a run-make test that checks our <code>core::ffi::c_*</code> types against Clang

A-FFIArea: Foreign function interface (FFI)Area: Foreign function interface (FFI)

A-testsuiteArea: The testsuite used to check the correctness of rustcArea: The testsuite used to check the correctness of rustc

E-hardCall for participation: Hard difficulty. Experience needed to fix: A lot.Call for participation: Hard difficulty. Experience needed to fix: A lot.

E-needs-designThis issue needs exploration and design to see how and if we can fix/implement itThis issue needs exploration and design to see how and if we can fix/implement it

E-needs-testCall for participation: An issue has been fixed and does not reproduce, but no test has been added.Call for participation: An issue has been fixed and does not reproduce, but no test has been added.

T-libsRelevant to the library team, which will review and decide on the PR/issue.Relevant to the library team, which will review and decide on the PR/issue.

Status: Open.

#133058 In rust-lang/rust;

· tgross35 opened on Nov 15, 2024

Incorrect warning about pointer to non_exhaustive ffi struct not being ffi safe

A-FFIArea: Foreign function interface (FFI)Area: Foreign function interface (FFI)

A-lintsArea: Lints (warnings about flaws in source code) such as unused_mut.Area: Lints (warnings about flaws in source code) such as unused_mut.

C-bugCategory: This is a bug.Category: This is a bug.

L-false-positiveLint: False positive (should not have fired).Lint: False positive (should not have fired).

L-improper_ctypesLint: improper_ctypesLint: improper_ctypes

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.

T-langRelevant to the language teamRelevant to the language team

Status: Open.

#132699 In rust-lang/rust;

· maia-s opened on Nov 6, 2024

repr(C) on an enum accepts discriminants that do not fit into the default C enum size

A-enumArea: Enums (discriminated unions, or more generally ADTs (algebraic data types))Area: Enums (discriminated unions, or more generally ADTs (algebraic data types))

A-FFIArea: Foreign function interface (FFI)Area: Foreign function interface (FFI)

A-reprArea: the `#[repr(stuff)]` attributeArea: the `#[repr(stuff)]` attribute

O-windowsOperating system: WindowsOperating system: Windows

O-windows-msvcToolchain: MSVC, Operating system: WindowsToolchain: MSVC, Operating system: Windows

Status: Open.

#124403 In rust-lang/rust;

· RalfJung opened on Apr 26, 2024

<code>improper_ctypes</code> is many clippy lints in 1~2 rustc lints

A-clippyArea: ClippyArea: Clippy

A-diagnosticsArea: Messages for errors, warnings, and lintsArea: Messages for errors, warnings, and lints

A-FFIArea: Foreign function interface (FFI)Area: Foreign function interface (FFI)

A-lintsArea: Lints (warnings about flaws in source code) such as unused_mut.Area: Lints (warnings about flaws in source code) such as unused_mut.

C-bugCategory: This is a bug.Category: This is a bug.

C-cleanupCategory: PRs that clean code up or issues documenting cleanup.Category: PRs that clean code up or issues documenting cleanup.

L-improper_ctypesLint: improper_ctypesLint: improper_ctypes

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.

T-langRelevant to the language teamRelevant to the language team

Status: Open.

#116963 In rust-lang/rust;

· workingjubilee opened on Oct 19, 2023

<code>improper_ctypes</code> fails to trigger on invalid <code>repr(transparent)</code> types

A-FFIArea: Foreign function interface (FFI)Area: Foreign function interface (FFI)

A-lintsArea: Lints (warnings about flaws in source code) such as unused_mut.Area: Lints (warnings about flaws in source code) such as unused_mut.

A-reprArea: the `#[repr(stuff)]` attributeArea: the `#[repr(stuff)]` attribute

C-bugCategory: This is a bug.Category: This is a bug.

L-improper_ctypesLint: improper_ctypesLint: improper_ctypes

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.

Status: Open.

#116959 In rust-lang/rust;

· workingjubilee opened on Oct 19, 2023

StackOverflow error when assert fails or panic when compiling to Android

A-crossArea: Cross compilationArea: Cross compilation

A-FFIArea: Foreign function interface (FFI)Area: Foreign function interface (FFI)

A-panicArea: Panicking machineryArea: Panicking machinery

C-bugCategory: This is a bug.Category: This is a bug.

O-androidOperating system: AndroidOperating system: Android

O-unixOperating system: Unix-likeOperating system: Unix-like

O-x86_64Target: x86-64 processors (like x86_64-*) (also known as amd64 and x64)Target: x86-64 processors (like x86_64-*) (also known as amd64 and x64)

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.

Status: Open.

#116309 In rust-lang/rust;

· matan-h opened on Oct 1, 2023

Rust called golang func by ffi failed on windows

A-FFIArea: Foreign function interface (FFI)Area: Foreign function interface (FFI)

A-linkageArea: linking into static, shared libraries and binariesArea: linking into static, shared libraries and binaries

C-bugCategory: This is a bug.Category: This is a bug.

Status: Open.

#115973 In rust-lang/rust;

· oligamiq opened on Sep 19, 2023

The sparc64, riscv64, loongarch64 <code>extern "C" fn</code> ABIs are all wrong when aligned/packed structs are involved

A-ABIArea: Concerning the application binary interface (ABI)Area: Concerning the application binary interface (ABI)

A-FFIArea: Foreign function interface (FFI)Area: Foreign function interface (FFI)

I-unsoundIssue: A soundness hole (worst kind of bug), see: https://en.wikipedia.org/wiki/SoundnessIssue: A soundness hole (worst kind of bug), see: https://en.wikipedia.org/wiki/Soundness

O-loongarchTarget: LoongArch (LA32R, LA32S, LA64)Target: LoongArch (LA32R, LA32S, LA64)

O-riscvTarget: RISC-V architectureTarget: RISC-V architecture

O-SPARCTarget: SPARC processorsTarget: SPARC processors

P-mediumMedium priorityMedium priority

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.

Status: Open.

#115609 In rust-lang/rust;

· RalfJung opened on Sep 6, 2023

<code>extern "C" fn</code> on mips64 targets does not respect repr(transparent)

A-ABIArea: Concerning the application binary interface (ABI)Area: Concerning the application binary interface (ABI)

A-FFIArea: Foreign function interface (FFI)Area: Foreign function interface (FFI)

I-unsoundIssue: A soundness hole (worst kind of bug), see: https://en.wikipedia.org/wiki/SoundnessIssue: A soundness hole (worst kind of bug), see: https://en.wikipedia.org/wiki/Soundness

O-MIPSTarget: MIPS processorsTarget: MIPS processors

P-lowLow priorityLow priority

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.

Status: Open.

#115404 In rust-lang/rust;

· RalfJung opened on Aug 31, 2023