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Incorrect/Invalid diagnostic: initializer was not imported from C header

bugA deviation from expected or documented behavior. Also: expected but undesirable behavior.A deviation from expected or documented behavior. Also: expected but undesirable behavior.

c interopFeature: Interoperability with CFeature: Interoperability with C

clang importerArea → compiler: The clang importerArea → compiler: The clang importer

Status: Open.

Bug

#83221 In swiftlang/swift;

· rauhul opened on Jul 21, 2025

Spurious warning about missing libc on AWS EC2 Linux instances

bugA deviation from expected or documented behavior. Also: expected but undesirable behavior.A deviation from expected or documented behavior. Also: expected but undesirable behavior.

c interopFeature: Interoperability with CFeature: Interoperability with C

clang importerArea → compiler: The clang importerArea → compiler: The clang importer

Status: Open.

#79865 In swiftlang/swift;

· earlywater opened on Mar 8, 2025

<code>BitwiseCopyable</code> attribute on C struct leads to compiler crash

attributesFeature: Declaration and type attributesFeature: Declaration and type attributes

bugA deviation from expected or documented behavior. Also: expected but undesirable behavior.A deviation from expected or documented behavior. Also: expected but undesirable behavior.

c interopFeature: Interoperability with CFeature: Interoperability with C

compilerThe Swift compiler itselfThe Swift compiler itself

crashBug: A crash, i.e., an abnormal termination of softwareBug: A crash, i.e., an abnormal termination of software

IRGenLLVM IR generationLLVM IR generation

swift 6.0

triage neededThis issue needs more specific labelsThis issue needs more specific labels

Status: Open.

#78368 In swiftlang/swift;

· amomchilov opened on Dec 27, 2024

Swift Compiler crashes when using a weak self inside a callback

accepts invalidBug: Accepts invalidBug: Accepts invalid

bugA deviation from expected or documented behavior. Also: expected but undesirable behavior.A deviation from expected or documented behavior. Also: expected but undesirable behavior.

c interopFeature: Interoperability with CFeature: Interoperability with C

closuresFeature: closuresFeature: closures

compilerThe Swift compiler itselfThe Swift compiler itself

crashBug: A crash, i.e., an abnormal termination of softwareBug: A crash, i.e., an abnormal termination of software

expressionsFeature: expressionsFeature: expressions

SIL

swift 6.0

Status: Open.

#78366 In swiftlang/swift;

· tapthaker opened on Dec 26, 2024

Support computing offset of union field for C imported type

c interopFeature: Interoperability with CFeature: Interoperability with C

featureA feature request or implementationA feature request or implementation

Status: Open.

#73903 In swiftlang/swift;

· compnerd opened on May 24, 2024

Swift / C build error related to missing definition of <code>fds_bits</code>.

bugA deviation from expected or documented behavior. Also: expected but undesirable behavior.A deviation from expected or documented behavior. Also: expected but undesirable behavior.

c interopFeature: Interoperability with CFeature: Interoperability with C

clang importerArea → compiler: The clang importerArea → compiler: The clang importer

Status: Open.

#69311 In swiftlang/swift;

· fibrechannelscsi opened on Oct 20, 2023

Explicit calling convention specifier on imported C functions are ignored

bugA deviation from expected or documented behavior. Also: expected but undesirable behavior.A deviation from expected or documented behavior. Also: expected but undesirable behavior.

c interopFeature: Interoperability with CFeature: Interoperability with C

Status: Open.

#69264 In swiftlang/swift;

· kateinoigakukun opened on Oct 19, 2023

Ownership lifetime crash with C structure containing blocks

bugA deviation from expected or documented behavior. Also: expected but undesirable behavior.A deviation from expected or documented behavior. Also: expected but undesirable behavior.

c interopFeature: Interoperability with CFeature: Interoperability with C

ownershipFeature: Ownership modifiers and semanticsFeature: Ownership modifiers and semantics

Status: Open.

#68416 In swiftlang/swift;

· lhoward opened on Sep 9, 2023

Support @_silgen_name C imports for SE-0324

@_silgen_nameFeature → attributes: The @_silgen_name attributeFeature → attributes: The @_silgen_name attribute

attributesFeature: Declaration and type attributesFeature: Declaration and type attributes

bugA deviation from expected or documented behavior. Also: expected but undesirable behavior.A deviation from expected or documented behavior. Also: expected but undesirable behavior.

c interopFeature: Interoperability with CFeature: Interoperability with C

compilerThe Swift compiler itselfThe Swift compiler itself

unexpected behaviorBug: Unexpected behavior or incorrect outputBug: Unexpected behavior or incorrect output

Status: Open.

#68332 In swiftlang/swift;

· glessard opened on Sep 5, 2023

Assertion failed: getFromType()-&gt;is&lt;AnyFunctionType&gt;() &amp;&amp; getToType()-&gt;is&lt;AnyFunctionType&gt;(), file S:\SourceCache\swift-project\swift\lib\Sema\CSDiagnostics.h, line 1043

assertion failureBug → crash: An assertion failureBug → crash: An assertion failure

bugA deviation from expected or documented behavior. Also: expected but undesirable behavior.A deviation from expected or documented behavior. Also: expected but undesirable behavior.

c interopFeature: Interoperability with CFeature: Interoperability with C

compilerThe Swift compiler itselfThe Swift compiler itself

crashBug: A crash, i.e., an abnormal termination of softwareBug: A crash, i.e., an abnormal termination of software

function typesFeature → types: function typesFeature → types: function types

swift 5.9

type checkerArea → compiler: Semantic analysisArea → compiler: Semantic analysis

typesFeature: typesFeature: types

Status: Open.

#66003 In swiftlang/swift;

· compnerd opened on May 18, 2023

[SR-16016] [Regression] Swift 5.6 SIL crash when reference C struct type

bugA deviation from expected or documented behavior. Also: expected but undesirable behavior.A deviation from expected or documented behavior. Also: expected but undesirable behavior.

c interopFeature: Interoperability with CFeature: Interoperability with C

compilerThe Swift compiler itselfThe Swift compiler itself

crashBug: A crash, i.e., an abnormal termination of softwareBug: A crash, i.e., an abnormal termination of software

IRGenLLVM IR generationLLVM IR generation

regression

swift 5.6

Status: Open.

#58277 In swiftlang/swift;

· swift-ci opened on Mar 18, 2022

[SR-16011] Undefined behavior when switching over a frozen enum imported from C

bugA deviation from expected or documented behavior. Also: expected but undesirable behavior.A deviation from expected or documented behavior. Also: expected but undesirable behavior.

c interopFeature: Interoperability with CFeature: Interoperability with C

compilerThe Swift compiler itselfThe Swift compiler itself

enumFeature → type declarations: Swift enumeration declarationsFeature → type declarations: Swift enumeration declarations

switch exhaustivityFeature: enforcement of exhaustivity in 'switch' statementsFeature: enforcement of exhaustivity in 'switch' statements

Status: Open.

#58272 In swiftlang/swift;

· grynspan opened on Mar 17, 2022