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Add wasm32-unknown-emscripten platform support #1628

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24 changes: 12 additions & 12 deletions Package.swift
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Expand Up @@ -395,14 +395,14 @@ extension Array where Element == PackageDescription.SwiftSetting {

.define("SWT_TARGET_OS_APPLE", .whenApple()),

.define("SWT_NO_EXIT_TESTS", .whenEmbedded(or: .when(platforms: [.iOS, .watchOS, .tvOS, .visionOS, .wasi, .android]))),
.define("SWT_NO_PROCESS_SPAWNING", .whenEmbedded(or: .when(platforms: [.iOS, .watchOS, .tvOS, .visionOS, .wasi, .android]))),
.define("SWT_NO_EXIT_TESTS", .whenEmbedded(or: .when(platforms: [.iOS, .watchOS, .tvOS, .visionOS, .wasi, .custom("emscripten"), .android]))),
.define("SWT_NO_PROCESS_SPAWNING", .whenEmbedded(or: .when(platforms: [.iOS, .watchOS, .tvOS, .visionOS, .wasi, .custom("emscripten"), .android]))),
.define("SWT_NO_SNAPSHOT_TYPES", .whenEmbedded(or: .whenApple(false))),
.define("SWT_NO_DYNAMIC_LINKING", .whenEmbedded(or: .when(platforms: [.wasi]))),
.define("SWT_NO_PIPES", .whenEmbedded(or: .when(platforms: [.wasi]))),
.define("SWT_NO_DYNAMIC_LINKING", .whenEmbedded(or: .when(platforms: [.wasi, .custom("emscripten")]))),
.define("SWT_NO_PIPES", .whenEmbedded(or: .when(platforms: [.wasi, .custom("emscripten")]))),
.define("SWT_NO_FOUNDATION_FILE_COORDINATION", .whenEmbedded(or: .whenApple(false))),
.define("SWT_NO_IMAGE_ATTACHMENTS", .whenEmbedded(or: .when(platforms: [.linux, .custom("freebsd"), .openbsd, .wasi, .android]))),
.define("SWT_NO_FILE_CLONING", .whenEmbedded(or: .when(platforms: [.openbsd, .wasi, .android]))),
.define("SWT_NO_IMAGE_ATTACHMENTS", .whenEmbedded(or: .when(platforms: [.linux, .custom("freebsd"), .openbsd, .wasi, .custom("emscripten"), .android]))),
.define("SWT_NO_FILE_CLONING", .whenEmbedded(or: .when(platforms: [.openbsd, .wasi, .custom("emscripten"), .android]))),

.define("SWT_NO_LEGACY_TEST_DISCOVERY", .whenEmbedded()),
.define("SWT_NO_LIBDISPATCH", .whenEmbedded()),
Expand Down Expand Up @@ -478,14 +478,14 @@ extension Array where Element == PackageDescription.CXXSetting {
var result = Self()

result += [
.define("SWT_NO_EXIT_TESTS", .whenEmbedded(or: .when(platforms: [.iOS, .watchOS, .tvOS, .visionOS, .wasi, .android]))),
.define("SWT_NO_PROCESS_SPAWNING", .whenEmbedded(or: .when(platforms: [.iOS, .watchOS, .tvOS, .visionOS, .wasi, .android]))),
.define("SWT_NO_EXIT_TESTS", .whenEmbedded(or: .when(platforms: [.iOS, .watchOS, .tvOS, .visionOS, .wasi, .custom("emscripten"), .android]))),
.define("SWT_NO_PROCESS_SPAWNING", .whenEmbedded(or: .when(platforms: [.iOS, .watchOS, .tvOS, .visionOS, .wasi, .custom("emscripten"), .android]))),
.define("SWT_NO_SNAPSHOT_TYPES", .whenEmbedded(or: .whenApple(false))),
.define("SWT_NO_DYNAMIC_LINKING", .whenEmbedded(or: .when(platforms: [.wasi]))),
.define("SWT_NO_PIPES", .whenEmbedded(or: .when(platforms: [.wasi]))),
.define("SWT_NO_DYNAMIC_LINKING", .whenEmbedded(or: .when(platforms: [.wasi, .custom("emscripten")]))),
.define("SWT_NO_PIPES", .whenEmbedded(or: .when(platforms: [.wasi, .custom("emscripten")]))),
.define("SWT_NO_FOUNDATION_FILE_COORDINATION", .whenEmbedded(or: .whenApple(false))),
.define("SWT_NO_IMAGE_ATTACHMENTS", .whenEmbedded(or: .when(platforms: [.linux, .custom("freebsd"), .openbsd, .wasi, .android]))),
.define("SWT_NO_FILE_CLONING", .whenEmbedded(or: .when(platforms: [.openbsd, .wasi, .android]))),
.define("SWT_NO_IMAGE_ATTACHMENTS", .whenEmbedded(or: .when(platforms: [.linux, .custom("freebsd"), .openbsd, .wasi, .custom("emscripten"), .android]))),
.define("SWT_NO_FILE_CLONING", .whenEmbedded(or: .when(platforms: [.openbsd, .wasi, .custom("emscripten"), .android]))),

.define("SWT_NO_LEGACY_TEST_DISCOVERY", .whenEmbedded()),
.define("SWT_NO_LIBDISPATCH", .whenEmbedded()),
Expand Down
6 changes: 3 additions & 3 deletions Sources/Testing/ABI/EntryPoints/EntryPoint.swift
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Expand Up @@ -798,7 +798,7 @@ extension Event.ConsoleOutputRecorder.Options {
// Windows does not set the "TERM" variable, so assume it supports 16-color
// ANSI escape codes.
true
#elseif os(WASI)
#elseif os(WASI) || os(Emscripten)
// The "Terminal" under WASI can be assumed to be the browser's JavaScript
// console, which we don't expect supports color escape codes.
false
Expand All @@ -820,7 +820,7 @@ extension Event.ConsoleOutputRecorder.Options {
// Windows does not set the "TERM" variable, so assume it supports 256-color
// ANSI escape codes.
true
#elseif os(WASI)
#elseif os(WASI) || os(Emscripten)
// The "Terminal" under WASI can be assumed to be the browser's JavaScript
// console, which we don't expect supports color escape codes.
false
Expand All @@ -842,7 +842,7 @@ extension Event.ConsoleOutputRecorder.Options {
// Windows does not set the "COLORTERM" variable, so assume it supports
// true-color ANSI escape codes. SEE: https://github.com/microsoft/terminal/issues/11057
true
#elseif os(WASI)
#elseif os(WASI) || os(Emscripten)
// The "Terminal" under WASI can be assumed to be the browser's JavaScript
// console, which we don't expect supports color escape codes.
false
Expand Down
2 changes: 1 addition & 1 deletion Sources/Testing/ABI/EntryPoints/SwiftPMEntryPoint.swift
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Expand Up @@ -24,7 +24,7 @@ private import _TestingInternals
///
/// This constant is not part of the public interface of the testing library.
var EXIT_NO_TESTS_FOUND: CInt {
#if SWT_TARGET_OS_APPLE || os(Linux) || os(FreeBSD) || os(OpenBSD) || os(Android) || os(WASI)
#if SWT_TARGET_OS_APPLE || os(Linux) || os(FreeBSD) || os(OpenBSD) || os(Android) || os(WASI) || os(Emscripten)
EX_UNAVAILABLE
#elseif os(Windows)
CInt(ERROR_NOT_FOUND)
Expand Down
8 changes: 5 additions & 3 deletions Sources/Testing/CMakeLists.txt
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Expand Up @@ -133,12 +133,14 @@ target_link_libraries(Testing PRIVATE
_TestingInternals
_TestingInterop)
if(NOT APPLE)
if(NOT CMAKE_SYSTEM_NAME STREQUAL WASI)
if(NOT CMAKE_SYSTEM_NAME STREQUAL WASI AND NOT CMAKE_SYSTEM_NAME STREQUAL Emscripten)
target_link_libraries(Testing PUBLIC
dispatch)
endif()
target_link_libraries(Testing PUBLIC
Foundation)
if(NOT CMAKE_SYSTEM_NAME STREQUAL Emscripten)
target_link_libraries(Testing PUBLIC
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@grynspan grynspan Mar 16, 2026

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Is Foundation not available in this environment? Is this a temporary constraint?

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@MaxDesiatov MaxDesiatov Mar 16, 2026

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This PR is marked as draft, as it's not ready for review yet.

Foundation)
endif()
if (CMAKE_SYSTEM_NAME STREQUAL "FreeBSD" OR
CMAKE_SYSTEM_NAME STREQUAL "OpenBSD")
target_link_libraries(Testing PUBLIC execinfo)
Expand Down
2 changes: 1 addition & 1 deletion Sources/Testing/ExitTests/ExitStatus.swift
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Expand Up @@ -141,7 +141,7 @@ extension ExitStatus: CustomStringConvertible {
.flatMap(String.init(validatingCString:))
.map { "SIG\($0)" }
#endif
#elseif os(Windows) || os(WASI)
#elseif os(Windows) || os(WASI) || os(Emscripten)
// These platforms do not have API to get the programmatic name of a
// signal constant.
#else
Expand Down
2 changes: 1 addition & 1 deletion Sources/Testing/SourceAttribution/Backtrace.swift
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Expand Up @@ -85,7 +85,7 @@ public struct Backtrace: Sendable {
initializedCount = .init(clamping: backtrace(addresses.baseAddress!, .init(clamping: addresses.count)))
#elseif os(Windows)
initializedCount = Int(clamping: RtlCaptureStackBackTrace(0, ULONG(clamping: addresses.count), addresses.baseAddress!, nil))
#elseif os(WASI)
#elseif os(WASI) || os(Emscripten)
// SEE: https://github.com/WebAssembly/WASI/issues/159
// SEE: https://github.com/swiftlang/swift/pull/31693
#else
Expand Down
2 changes: 1 addition & 1 deletion Sources/Testing/Support/Additions/CommandLineAdditions.swift
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Expand Up @@ -107,7 +107,7 @@ extension CommandLine {
}
}
return result!
#elseif os(WASI)
#elseif os(WASI) || os(Emscripten)
// WASI does not really have the concept of a file system path to the main
// executable, so simply return the first argument--presumably the program
// name, but as you know this is not guaranteed by the C standard!
Expand Down
8 changes: 4 additions & 4 deletions Sources/Testing/Support/Environment.swift
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Expand Up @@ -46,7 +46,7 @@ package enum Environment {
}
}

#if SWT_TARGET_OS_APPLE || os(Linux) || os(FreeBSD) || os(OpenBSD) || os(Android) || os(WASI)
#if SWT_TARGET_OS_APPLE || os(Linux) || os(FreeBSD) || os(OpenBSD) || os(Android) || os(WASI) || os(Emscripten)
/// Get all environment variables from a POSIX environment block.
///
/// - Parameters:
Expand Down Expand Up @@ -107,7 +107,7 @@ package enum Environment {
}
#endif
return _get(fromEnviron: _NSGetEnviron()!.pointee!)
#elseif os(Linux) || os(FreeBSD) || os(OpenBSD) || os(Android)
#elseif os(Linux) || os(FreeBSD) || os(OpenBSD) || os(Android) || os(Emscripten)
_get(fromEnviron: swt_environ())
#elseif os(WASI)
_get(fromEnviron: __wasilibc_get_environ())
Expand Down Expand Up @@ -174,7 +174,7 @@ package enum Environment {
}
return nil
}
#elseif SWT_TARGET_OS_APPLE || os(Linux) || os(FreeBSD) || os(OpenBSD) || os(Android) || os(WASI)
#elseif SWT_TARGET_OS_APPLE || os(Linux) || os(FreeBSD) || os(OpenBSD) || os(Android) || os(WASI) || os(Emscripten)
getenv(name).flatMap { String(validatingCString: $0) }
#elseif os(Windows)
name.withCString(encodedAs: UTF16.self) { name in
Expand Down Expand Up @@ -258,7 +258,7 @@ extension Environment {
environment[name] = value
}
return true
#elseif SWT_TARGET_OS_APPLE || os(Linux) || os(FreeBSD) || os(OpenBSD) || os(Android) || os(WASI)
#elseif SWT_TARGET_OS_APPLE || os(Linux) || os(FreeBSD) || os(OpenBSD) || os(Android) || os(WASI) || os(Emscripten)
if let value {
return 0 == setenv(name, value, 1)
}
Expand Down
10 changes: 5 additions & 5 deletions Sources/Testing/Support/FileHandle.swift
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Expand Up @@ -309,7 +309,7 @@ struct FileHandle: ~Copyable, Sendable {
/// descriptor, `nil` is passed to `body`.
borrowing func withUnsafePOSIXFileDescriptor<R>(_ body: (CInt?) throws -> R) rethrows -> R {
try withUnsafeCFILEHandle { handle in
#if SWT_TARGET_OS_APPLE || os(Linux) || os(FreeBSD) || os(OpenBSD) || os(Android) || os(WASI)
#if SWT_TARGET_OS_APPLE || os(Linux) || os(FreeBSD) || os(OpenBSD) || os(Android) || os(WASI) || os(Emscripten)
let fd = fileno(handle)
#elseif os(Windows)
let fd = _fileno(handle)
Expand Down Expand Up @@ -368,7 +368,7 @@ struct FileHandle: ~Copyable, Sendable {
/// other threads.
borrowing func withLock<R>(_ body: () throws -> R) rethrows -> R {
try withUnsafeCFILEHandle { handle in
#if SWT_TARGET_OS_APPLE || os(Linux) || os(FreeBSD) || os(OpenBSD) || os(Android)
#if SWT_TARGET_OS_APPLE || os(Linux) || os(FreeBSD) || os(OpenBSD) || os(Android) || os(Emscripten)
flockfile(handle)
defer {
funlockfile(handle)
Expand Down Expand Up @@ -403,7 +403,7 @@ extension FileHandle {
// If possible, reserve enough space in the resulting buffer to contain
// the contents of the file being read.
var size: Int?
#if SWT_TARGET_OS_APPLE || os(Linux) || os(FreeBSD) || os(OpenBSD) || os(Android) || os(WASI)
#if SWT_TARGET_OS_APPLE || os(Linux) || os(FreeBSD) || os(OpenBSD) || os(Android) || os(WASI) || os(Emscripten)
withUnsafePOSIXFileDescriptor { fd in
var s = stat()
if let fd, 0 == fstat(fd, &s) {
Expand Down Expand Up @@ -667,7 +667,7 @@ extension FileHandle {
extension FileHandle {
/// Is this file handle a TTY or PTY?
var isTTY: Bool {
#if SWT_TARGET_OS_APPLE || os(Linux) || os(FreeBSD) || os(OpenBSD) || os(Android) || os(WASI)
#if SWT_TARGET_OS_APPLE || os(Linux) || os(FreeBSD) || os(OpenBSD) || os(Android) || os(WASI) || os(Emscripten)
// If stderr is a TTY and TERM is set, that's good enough for us.
withUnsafePOSIXFileDescriptor { fd in
if let fd, 0 != isatty(fd), let term = Environment.variable(named: "TERM"), !term.isEmpty {
Expand Down Expand Up @@ -769,7 +769,7 @@ func fileExists(atPath path: String) -> Bool {
/// resolved, the resulting string may differ slightly but refers to the same
/// file system object. If the path could not be resolved, returns `nil`.
func canonicalizePath(_ path: String) -> String? {
#if SWT_TARGET_OS_APPLE || os(Linux) || os(FreeBSD) || os(OpenBSD) || os(Android) || os(WASI)
#if SWT_TARGET_OS_APPLE || os(Linux) || os(FreeBSD) || os(OpenBSD) || os(Android) || os(WASI) || os(Emscripten)
path.withCString { path in
if let resolvedCPath = realpath(path, nil) {
defer {
Expand Down
2 changes: 1 addition & 1 deletion Sources/Testing/Support/Serializer.swift
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Expand Up @@ -20,7 +20,7 @@ private var _cpuCoreCount: Int? {
var siInfo = SYSTEM_INFO()
GetSystemInfo(&siInfo)
return Int(siInfo.dwNumberOfProcessors)
#elseif os(WASI)
#elseif os(WASI) || os(Emscripten)
return 1
#else
#warning("Platform-specific implementation missing: CPU core count unavailable")
Expand Down
3 changes: 2 additions & 1 deletion Sources/Testing/Support/Versions.swift
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Expand Up @@ -88,9 +88,10 @@ let operatingSystemVersion: String = {
return result
}
}
#elseif os(WASI)
#elseif os(WASI) || os(Emscripten)
// WASI does not have an API to get the current WASI or Wasm version.
// wasi-libc does have uname(3), but it's stubbed out.
// Emscripten's uname(3) is similarly limited.
#else
#warning("Platform-specific implementation missing: OS version unavailable")
#endif
Expand Down
2 changes: 1 addition & 1 deletion Sources/Testing/Traits/Tags/Tag.Color+Loading.swift
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Expand Up @@ -70,7 +70,7 @@ var swiftTestingDirectoryPath: String? {
if let appDataDirectoryPath = _appDataDirectoryPath {
return appendPathComponent(swiftTestingDirectoryName, to: appDataDirectoryPath)
}
#elseif os(WASI)
#elseif os(WASI) || os(Emscripten)
// WASI does not support the concept of a home directory.
#else
#warning("Platform-specific implementation missing: .swift-testing directory location unavailable")
Expand Down
2 changes: 1 addition & 1 deletion Sources/_TestDiscovery/SectionBounds.swift
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Expand Up @@ -346,7 +346,7 @@ private struct _SectionBound: Sendable, ~Copyable {
@_silgen_name(raw: "section$start$__TEXT$__swift5_types") private nonisolated(unsafe) var _typeMetadataSectionBegin: _SectionBound
@_silgen_name(raw: "section$end$__TEXT$__swift5_types") private nonisolated(unsafe) var _typeMetadataSectionEnd: _SectionBound
#endif
#elseif os(Linux) || os(FreeBSD) || os(OpenBSD) || os(Android) || os(WASI)
#elseif os(Linux) || os(FreeBSD) || os(OpenBSD) || os(Android) || os(WASI) || os(Emscripten)
@_silgen_name(raw: "__start_swift5_tests") private nonisolated(unsafe) var _testContentSectionBegin: _SectionBound
@_silgen_name(raw: "__stop_swift5_tests") private nonisolated(unsafe) var _testContentSectionEnd: _SectionBound
#if !SWT_NO_LEGACY_TEST_DISCOVERY
Expand Down
2 changes: 1 addition & 1 deletion Sources/_TestingInternals/include/Stubs.h
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Expand Up @@ -139,7 +139,7 @@ static const IMAGE_SECTION_HEADER *_Null_unspecified swt_IMAGE_FIRST_SECTION(con
}
#endif

#if defined(__linux__) || defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__ANDROID__)
#if defined(__linux__) || defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__ANDROID__) || defined(__EMSCRIPTEN__)
/// The environment block.
///
/// By POSIX convention, the environment block variable is declared in client
Expand Down
8 changes: 4 additions & 4 deletions cmake/modules/shared/CompilerSettings.cmake
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Expand Up @@ -27,26 +27,26 @@ add_compile_options(
if(APPLE)
add_compile_definitions("SWT_TARGET_OS_APPLE")
endif()
set(SWT_NO_EXIT_TESTS_LIST "iOS" "watchOS" "tvOS" "visionOS" "WASI" "Android")
set(SWT_NO_EXIT_TESTS_LIST "iOS" "watchOS" "tvOS" "visionOS" "WASI" "Emscripten" "Android")
if(CMAKE_SYSTEM_NAME IN_LIST SWT_NO_EXIT_TESTS_LIST)
add_compile_definitions("SWT_NO_EXIT_TESTS")
endif()
set(SWT_NO_PROCESS_SPAWNING_LIST "iOS" "watchOS" "tvOS" "visionOS" "WASI" "Android")
set(SWT_NO_PROCESS_SPAWNING_LIST "iOS" "watchOS" "tvOS" "visionOS" "WASI" "Emscripten" "Android")
if(CMAKE_SYSTEM_NAME IN_LIST SWT_NO_PROCESS_SPAWNING_LIST)
add_compile_definitions("SWT_NO_PROCESS_SPAWNING")
endif()
if(NOT APPLE)
add_compile_definitions("SWT_NO_SNAPSHOT_TYPES")
add_compile_definitions("SWT_NO_FOUNDATION_FILE_COORDINATION")
endif()
if(CMAKE_SYSTEM_NAME STREQUAL "WASI")
if(CMAKE_SYSTEM_NAME STREQUAL "WASI" OR CMAKE_SYSTEM_NAME STREQUAL "Emscripten")
add_compile_definitions("SWT_NO_DYNAMIC_LINKING")
add_compile_definitions("SWT_NO_PIPES")
endif()
if (NOT (APPLE OR CMAKE_SYSTEM_NAME STREQUAL "Windows"))
add_compile_definitions("SWT_NO_IMAGE_ATTACHMENTS")
endif()
set(SWT_NO_FILE_CLONING_LIST "OpenBSD" "WASI" "Android")
set(SWT_NO_FILE_CLONING_LIST "OpenBSD" "WASI" "Emscripten" "Android")
if(CMAKE_SYSTEM_NAME IN_LIST SWT_NO_FILE_CLONING_LIST)
add_compile_definitions("SWT_NO_FILE_CLONING")
endif()
Expand Down
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