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Given you are on macOS 15.0 and installed the toolchain via https://www.swift.org/install/macos/ and installed using the package installer the import of Foundation is causing problems when building. The output I will include at the end but how to reproduce is
export TOOLCHAINS=$(plutil -extract CFBundleIdentifier raw /Library/Developer/Toolchains/swift-6.0-RELEASE.xctoolchain/Info.plist)
mkdir swift-tool &&cd swift-tool
swift package init --type executable
echo`import Foundation`>> Sources/main.swift
swift build
this will output the following error
Building for debugging...
error: emit-module command failed due to signal 6 (use -v to see invocation)
Please submit a bug report (https://swift.org/contributing/#reporting-bugs) and include the crash backtrace.
Stack dump:
0. Program arguments: /Library/Developer/Toolchains/swift-6.0-RELEASE.xctoolchain/usr/bin/swift-frontend -frontend -emit-module -experimental-skip-non-inlinable-function-bodies-without-types /Users/stijnwillems/Developer/swift-tool/Sources/main.swift -target arm64-apple-macosx10.13 -Xllvm -aarch64-use-tbi -enable-objc-interop -sdk /Applications/Xcode-16.0.0.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX15.0.sdk -I /Users/stijnwillems/Developer/swift-tool/.build/arm64-apple-macosx/debug/Modules -I /Library/Developer/Toolchains/swift-6.0-RELEASE.xctoolchain/usr/lib/swift/macosx/testing -I /Applications/Xcode-16.0.0.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/lib -F /Applications/Xcode-16.0.0.app/Contents/Developer/Platforms/MacOSX.platform/Developer/Library/Frameworks -color-diagnostics -enable-testing -g -debug-info-format=dwarf -dwarf-version=4 -module-cache-path /Users/stijnwillems/Developer/swift-tool/.build/arm64-apple-macosx/debug/ModuleCache -swift-version 6 -Onone -D SWIFT_PACKAGE -D DEBUG -entry-point-function-name swift_tool_main -empty-abi-descriptor -plugin-path /Library/Developer/Toolchains/swift-6.0-RELEASE.xctoolchain/usr/lib/swift/host/plugins/testing -resource-dir /Library/Developer/Toolchains/swift-6.0-RELEASE.xctoolchain/usr/lib/swift -enable-anonymous-context-mangled-names -file-compilation-dir /Users/stijnwillems/Developer/swift-tool -Xcc -isysroot -Xcc /Applications/Xcode-16.0.0.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX15.0.sdk -Xcc -F -Xcc /Applications/Xcode-16.0.0.app/Contents/Developer/Platforms/MacOSX.platform/Developer/Library/Frameworks -Xcc -fPIC -Xcc -g -module-name swift_tool -package-name swift_tool -plugin-path /Library/Developer/Toolchains/swift-6.0-RELEASE.xctoolchain/usr/lib/swift/host/plugins -plugin-path /Library/Developer/Toolchains/swift-6.0-RELEASE.xctoolchain/usr/local/lib/swift/host/plugins -target-sdk-version 15.0 -target-sdk-name macosx15.0 -external-plugin-path /Applications/Xcode-16.0.0.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/lib/swift/host/plugins#/Applications/Xcode-16.0.0.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/bin/swift-plugin-server -external-plugin-path /Applications/Xcode-16.0.0.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/local/lib/swift/host/plugins#/Applications/Xcode-16.0.0.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/bin/swift-plugin-server -emit-module-doc-path /Users/stijnwillems/Developer/swift-tool/.build/arm64-apple-macosx/debug/Modules/swift_tool.swiftdoc -emit-module-source-info-path /Users/stijnwillems/Developer/swift-tool/.build/arm64-apple-macosx/debug/Modules/swift_tool.swiftsourceinfo -emit-dependencies-path /Users/stijnwillems/Developer/swift-tool/.build/arm64-apple-macosx/debug/swift_tool.build/swift_tool.emit-module.d -o /Users/stijnwillems/Developer/swift-tool/.build/arm64-apple-macosx/debug/Modules/swift_tool.swiftmodule -emit-abi-descriptor-path /Users/stijnwillems/Developer/swift-tool/.build/arm64-apple-macosx/debug/Modules/swift_tool.abi.json
1. Apple Swift version 6.0 (swift-6.0-RELEASE)
2. Compiling with the current language version
3. While evaluating request ExecuteSILPipelineRequest(Run pipelines { Mandatory Diagnostic Passes + Enabling Optimization Passes } on SIL for Darwin)
4. While running pass #2548 SILModuleTransform "MandatorySILLinker".
5. While deserializing SIL function"$s6Darwin14POSIXErrorCodeO8rawValueACSgs5Int32V_tcfC"
6. *** DESERIALIZATION FAILURE ****** If any module named here was modified in the SDK, please delete the ****** new swiftmodule files from the SDK and keep only swiftinterfaces. ***
module '_errno', builder version '6.0(6.0)/Apple Swift version 6.0 (swift-6.0-RELEASE)', built from swiftinterface, resilient, loaded from '/Users/stijnwillems/Developer/swift-tool/.build/arm64-apple-macosx/debug/ModuleCache/_errno-2GQWKKCJV8S7T.swiftmodule'
SILFunction type mismatch for'$s6Darwin14POSIXErrorCodeO8rawValueACSgs5Int32V_tcfC': '$@convention(method) (Int32, @thin POSIXErrorCode.Type) -> Optional<POSIXErrorCode>'!= '$@convention(method) (Int32, @thin POSIXErrorCode.Type) -> Optional<POSIXErrorCode>'
Stack dump without symbol names (ensure you have llvm-symbolizer in your PATH or set the environment var `LLVM_SYMBOLIZER_PATH` to point to it):
0 swift-frontend 0x0000000109c51e28 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) + 56
1 swift-frontend 0x0000000109c505f4 llvm::sys::RunSignalHandlers() + 112
2 swift-frontend 0x0000000109c52470 SignalHandler(int) + 304
3 libsystem_platform.dylib 0x000000018c638184 _sigtramp + 56
4 libsystem_pthread.dylib 0x000000018c602f70 pthread_kill + 288
5 libsystem_c.dylib 0x000000018c50f908 abort + 128
6 swift-frontend 0x000000010550dadc swift::ModuleFileSharedCore::fatal(llvm::Error) const + 1224
7 swift-frontend 0x00000001054a34dc swift::ModuleFile::getSourceLoc() const + 0
8 swift-frontend 0x00000001054e7a44 swift::SILDeserializer::readSILFunctionChecked(llvm::PointerEmbeddedInt<unsigned int, 31>, swift::SILFunction*, llvm::StringRef, bool, bool) + 1896
9 swift-frontend 0x00000001054f8bbc swift::SILDeserializer::lookupSILFunction(swift::SILFunction*, bool) + 184
10 swift-frontend 0x0000000105597bfc swift::SerializedSILLoader::lookupSILFunction(swift::SILFunction*, bool) + 148
11 swift-frontend 0x00000001055cfd68 swift::SILLinkerVisitor::process() + 484
12 swift-frontend 0x00000001055cfb54 swift::SILLinkerVisitor::processFunction(swift::SILFunction*) + 108
13 swift-frontend 0x000000010564b43c swift::SILModule::linkFunction(swift::SILFunction*, swift::SILModule::LinkingMode) + 108
14 swift-frontend 0x00000001052e71e4 (anonymous namespace)::SILLinker::run() + 128
15 swift-frontend 0x00000001051ad81c swift::SILPassManager::runModulePass(unsigned int) + 856
16 swift-frontend 0x00000001051afbc0 swift::SILPassManager::execute() + 624
17 swift-frontend 0x00000001051aa5ac swift::SILPassManager::executePassPipelinePlan(swift::SILPassPipelinePlan const&) + 72
18 swift-frontend 0x00000001051aa52c swift::ExecuteSILPipelineRequest::evaluate(swift::Evaluator&, swift::SILPipelineExecutionDescriptor) const + 68
19 swift-frontend 0x00000001051e5934 swift::SimpleRequest<swift::ExecuteSILPipelineRequest, std::__1::tuple<> (swift::SILPipelineExecutionDescriptor), (swift::RequestFlags)1>::evaluateRequest(swift::ExecuteSILPipelineRequest const&, swift::Evaluator&) + 28
20 swift-frontend 0x00000001051c5e90 swift::ExecuteSILPipelineRequest::OutputType swift::Evaluator::getResultUncached<swift::ExecuteSILPipelineRequest, swift::ExecuteSILPipelineRequest::OutputType swift::evaluateOrFatal<swift::ExecuteSILPipelineRequest>(swift::Evaluator&, swift::ExecuteSILPipelineRequest)::'lambda'()>(swift::ExecuteSILPipelineRequest const&, swift::ExecuteSILPipelineRequest::OutputType swift::evaluateOrFatal<swift::ExecuteSILPipelineRequest>(swift::Evaluator&, swift::ExecuteSILPipelineRequest)::'lambda'()) + 20421 swift-frontend 0x00000001051aa788 swift::executePassPipelinePlan(swift::SILModule*, swift::SILPassPipelinePlan const&, bool, swift::irgen::IRGenModule*) + 6422 swift-frontend 0x00000001051c8358 swift::runSILDiagnosticPasses(swift::SILModule&) + 19223 swift-frontend 0x00000001049e6ff4 swift::CompilerInstance::performSILProcessing(swift::SILModule*) + 8024 swift-frontend 0x00000001049f2118 swift::ExplicitModuleInterfaceBuilder::buildSwiftModuleFromInterface(llvm::StringRef, llvm::StringRef, bool, std::__1::unique_ptr<llvm::MemoryBuffer, std::__1::default_delete<llvm::MemoryBuffer>>*, llvm::ArrayRef<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>>, llvm::StringRef) + 237225 swift-frontend 0x00000001049f374c std::__1::error_code llvm::function_ref<std::__1::error_code (swift::SubCompilerInstanceInfo&)>::callback_fn<swift::ImplicitModuleInterfaceBuilder::buildSwiftModuleInternal(llvm::StringRef, bool, std::__1::unique_ptr<llvm::MemoryBuffer, std::__1::default_delete<llvm::MemoryBuffer>>*, llvm::ArrayRef<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>>)::$_3::operator()() const::'lambda'(swift::SubCompilerInstanceInfo&)>(long, swift::SubCompilerInstanceInfo&) + 20826 swift-frontend 0x00000001049fe760 swift::InterfaceSubContextDelegateImpl::runInSubCompilerInstance(llvm::StringRef, llvm::StringRef, llvm::StringRef, llvm::StringRef, swift::SourceLoc, bool, llvm::function_ref<std::__1::error_code (swift::SubCompilerInstanceInfo&)>) + 237227 swift-frontend 0x00000001049f34e0 void llvm::function_ref<void ()>::callback_fn<swift::ImplicitModuleInterfaceBuilder::buildSwiftModuleInternal(llvm::StringRef, bool, std::__1::unique_ptr<llvm::MemoryBuffer, std::__1::default_delete<llvm::MemoryBuffer>>*, llvm::ArrayRef<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>>)::$_3>(long) + 26828 swift-frontend 0x0000000109bc8438 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) + 16429 swift-frontend 0x0000000109bc8558 RunSafelyOnThread_Dispatch(void*) + 5230 swift-frontend 0x0000000109bc8580 void* llvm::thread::ThreadProxy<std::__1::tuple<void (*)(void*), (anonymous namespace)::RunSafelyOnThreadInfo*>>(void*) + 2431 libsystem_pthread.dylib 0x000000018c6032e4 _pthread_start + 13632 libsystem_pthread.dylib 0x000000018c5fe0fc thread_start + 8
by adding dependency to swift-foundation and using import FoundationEssentials seams to work but has other issues.
This is only intended to be used as a development convenience and it will not work in situations when you are not working on swift-foundation itself. The correct path forward here is to remove the package dependency, and there are folks working on fixing the compiler crash that you reported
Given you are on macOS 15.0 and installed the toolchain via https://www.swift.org/install/macos/ and installed using the package installer the import of Foundation is causing problems when building. The output I will include at the end but how to reproduce is
this will output the following error
Trying to mitigate the issue like described swift forum post https://forums.swift.org/t/using-swift-foundation-with-linux-static-sdk/74642 by adding dependency to
swift-foundation
and usingimport FoundationEssentials
seams to work but has other issues.This seams to contradict the docs stating that foundation and especially FoundationEssentials is included in the toolchain on any platform?
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