How can I enable Rust features in Swift?

[FoodChain1028]

full error traceback

How can I enable rust features in swift?

We are building a project that uses uniffi to generate swift library to call rust.

However, when we used uniffi::build_foreign_language_testcases!() function to test the function in swift, it turned out that the features are not enabled like this:

gpu-benchmarks feature not enabled!
thread '<unnamed>' panicked at 'gpu-benchmarks feature not enabled!', src/lib.rs:183:5
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
Swift/ErrorType.swift:200: Fatal error: Error raised at top level: mopro.(unknown context at $10f04699c).UniffiInternalError.rustPanic("gpu-benchmarks feature not enabled!")
Stack dump:
0.      Program arguments: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift-frontend -frontend -interpret /Users/foodchain/Documents/PSE/mopro-21/mopro-ffi/tests/bindings/test_mopro_gpu_benchmarks.swift -Xllvm -aarch64-use-tbi -enable-objc-interop -stack-check -sdk /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX14.2.sdk -I /Users/foodchain/Documents/PSE/mopro-21/mopro-ffi/target/tmp/mopro-ffi-c9b386fc8fa179b3 -color-diagnostics -new-driver-path /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift-driver -empty-abi-descriptor -resource-dir /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift -Xcc -fmodule-map-file=/Users/foodchain/Documents/PSE/mopro-21/mopro-ffi/target/tmp/mopro-ffi-c9b386fc8fa179b3/moproFFI.modulemap -module-name test_mopro_gpu_benchmarks -disable-clang-spi -target-sdk-version 14.2 -target-sdk-name macosx14.2 -external-plugin-path /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX14.2.sdk/usr/lib/swift/host/plugins#/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX14.2.sdk/usr/bin/swift-plugin-server -external-plugin-path /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX14.2.sdk/usr/local/lib/swift/host/plugins#/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX14.2.sdk/usr/bin/swift-plugin-server -external-plugin-path /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/lib/swift/host/plugins#/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/bin/swift-plugin-server -external-plugin-path /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/local/lib/swift/host/plugins#/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/bin/swift-plugin-server -plugin-path /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift/host/plugins -plugin-path /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/local/lib/swift/host/plugins -lmopro_ffi -ltestmod_mopro
1.      Apple Swift version 5.9.2 (swiftlang-5.9.2.2.56 clang-1500.1.0.2.5)
3.      Compiling with the current language version
4.      While running user code "/Users/foodchain/Documents/PSE/mopro-21/mopro-ffi/tests/bindings/test_mopro_gpu_benchmarks.swift"
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           0x00000001039d9abc llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) + 56
1  swift-frontend           0x000000010663fcb0 llvm::sys::RunSignalHandlers() + 112
2  swift-frontend           0x00000001063a9054 SignalHandler(int) + 352
3  libsystem_platform.dylib 0x00000001841a4a24 _sigtramp + 56
4  libswiftCore.dylib       0x0000000193a6f1e8 $ss17_assertionFailure__4file4line5flagss5NeverOs12StaticStringV_SSAHSus6UInt32VtF + 268
5  libswiftCore.dylib       0x0000000193b0ca24 $ss5ErrorPsSYRzs17FixedWidthInteger8RawValueSYRpzrlE5_codeSivg + 0
6  libswiftCore.dylib       0x000000010dbfc6d4 $ss5ErrorPsSYRzs17FixedWidthInteger8RawValueSYRpzrlE5_codeSivg + 18446744071462386864
7  swift-frontend           0x0000000104f8ddb8 llvm::orc::runAsMain(int (*)(int, char**), llvm::ArrayRef<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>>, llvm::Optional<llvm::StringRef>) + 1276
8  swift-frontend           0x0000000100ff57e8 swift::RunImmediately(swift::CompilerInstance&, std::__1::vector<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>, std::__1::allocator<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>>> const&, swift::IRGenOptions const&, swift::SILOptions const&, std::__1::unique_ptr<swift::SILModule, std::__1::default_delete<swift::SILModule>>&&) + 11524
9  swift-frontend           0x0000000105f19c24 processCommandLineAndRunImmediately(swift::CompilerInstance&, std::__1::unique_ptr<swift::SILModule, std::__1::default_delete<swift::SILModule>>&&, llvm::PointerUnion<swift::ModuleDecl*, swift::SourceFile*>, swift::FrontendObserver*, int&) + 484
10 swift-frontend           0x0000000105f21650 performCompileStepsPostSILGen(swift::CompilerInstance&, std::__1::unique_ptr<swift::SILModule, std::__1::default_delete<swift::SILModule>>, llvm::PointerUnion<swift::ModuleDecl*, swift::SourceFile*>, swift::PrimarySpecificPaths const&, int&, swift::FrontendObserver*) + 1464
11 swift-frontend           0x0000000105f1cf00 performCompile(swift::CompilerInstance&, int&, swift::FrontendObserver*) + 3020
12 swift-frontend           0x0000000105f20854 swift::performFrontend(llvm::ArrayRef<char const*>, char const*, void*, swift::FrontendObserver*) + 4568
13 swift-frontend           0x0000000105f87d44 swift::mainEntry(int, char const**) + 4408
14 dyld                     0x0000000183df50e0 start + 2360

I tried to fix this by building in features, however, it wasn't working.

[mhammond]

The features are specified when you are building the Rust crate. It's not possible to specify them from the bindings because they are run after the crate has been built.