diff --git a/Sources/SWBCore/SDKRegistry.swift b/Sources/SWBCore/SDKRegistry.swift
index 3a8dc465..0777dc4d 100644
--- a/Sources/SWBCore/SDKRegistry.swift
+++ b/Sources/SWBCore/SDKRegistry.swift
@@ -515,6 +515,9 @@ public protocol SDKRegistryLookup: Sendable {
     /// - returns: The found `SDK`, or `nil` if no SDK with the given name could be found or `name` was in an invalid format.
     func lookup(_ name: String, activeRunDestination: RunDestinationInfo?) throws -> SDK?
 
+    /// Synthesize an SDK for the given platform with the given manifest JSON file path
+    func synthesizedSDK(platform: Platform, sdkManifestPath: String, triple: String) throws -> SDK?
+
     /// Look up the SDK with the given path.  If the registry is immutable, then this will only return the SDK if it was loaded when the registry was created; only mutable registries can discover and load new SDKs after that point.
     /// - parameter path: Absolute path of the SDK to look up.
     /// - returns: The found `SDK`, or `nil` if no SDK was found at the given path.
@@ -1153,6 +1156,96 @@ public final class SDKRegistry: SDKRegistryLookup, CustomStringConvertible, Send
         return sdk
     }
 
+    public func synthesizedSDK(platform: Platform, sdkManifestPath: String, triple: String) throws -> SDK? {
+        // Let's check the active run destination to see if there's an SDK path that we should be using
+        let llvmTriple = try LLVMTriple(triple)
+
+        let host = hostOperatingSystem
+
+        // Don't allow re-registering the same SDK
+        if let existing = sdksByPath[Path(sdkManifestPath)] {
+            return existing
+        }
+
+        if let swiftSDK = try SwiftSDK(identifier: sdkManifestPath, version: "1.0.0", path: Path(sdkManifestPath), fs: localFS) {
+            let defaultProperties: [String: PropertyListItem] = [
+                "SDK_STAT_CACHE_ENABLE": "NO",
+
+                "GENERATE_TEXT_BASED_STUBS": "NO",
+                "GENERATE_INTERMEDIATE_TEXT_BASED_STUBS": "NO",
+
+                // TODO check how this impacts operation on Windows
+                "CHOWN": "/usr/bin/chown",
+
+                // TODO are these going to be appropriate for all kinds of SDK's?
+                // SwiftSDK _could_ have tool entries for these, so use them if they are available
+                "LIBTOOL": .plString(host.imageFormat.executableName(basename: "llvm-lib")),
+                "AR": .plString(host.imageFormat.executableName(basename: "llvm-ar")),
+            ]
+
+            for (sdkTriple, tripleProperties) in swiftSDK.targetTriples {
+                guard triple == sdkTriple else {
+                    continue
+                }
+
+                let toolsets = try tripleProperties.loadToolsets(sdk: swiftSDK, fs: localFS)
+
+                let sysroot = swiftSDK.path.join(tripleProperties.sdkRootPath)
+
+                // TODO support dynamic resources path
+                let swiftResourceDir = swiftSDK.path.join(tripleProperties.swiftStaticResourcesPath)
+                let clangResourceDir = swiftSDK.path.join(tripleProperties.clangStaticResourcesPath)
+
+                let tripleSystem = llvmTriple.system + (llvmTriple.systemVersion?.description ?? "")
+
+                // TODO handle tripleProperties.toolSearchPaths
+
+                let extraSwiftCompilerSettings = Array(toolsets.map( { $0.swiftCompiler?.extraCLIOptions ?? [] }).flatMap( { $0 }))
+                let headerSearchPaths: [PropertyListItem] = ["$(inherited)"] + (tripleProperties.includeSearchPaths ?? []).map( { PropertyListItem.plString($0) } )
+                let librarySearchPaths: [PropertyListItem] = ["$(inherited)"] + (tripleProperties.librarySearchPaths ?? []).map( { PropertyListItem.plString($0) } )
+
+                let sdk = registerSDK(sysroot, sysroot, platform, .plDict([
+                    "Type": .plString("SDK"),
+                    "Version": .plString(swiftSDK.version),
+                    "CanonicalName": .plString(swiftSDK.identifier),
+                    "Aliases": [],
+                    "IsBaseSDK": .plBool(true),
+                    "DefaultProperties": .plDict([
+                        "PLATFORM_NAME": .plString(platform.name),
+                    ].merging(defaultProperties, uniquingKeysWith: { _, new in new })),
+                    "CustomProperties": .plDict([
+                        "LIBRARY_SEARCH_PATHS": .plArray(librarySearchPaths),
+                        "HEADER_SEARCH_PATHS": .plArray(headerSearchPaths),
+                        "OTHER_SWIFT_FLAGS": .plArray(["$(inherited)"] + extraSwiftCompilerSettings.map( {.plString($0)} )),
+                        "SWIFTC_RESOURCE_DIR": .plString(swiftResourceDir.str), // Resource dir for linking Swift
+                        "SWIFT_RESOURCE_DIR": .plString(swiftResourceDir.str), // Resource dir for compiling Swift
+                        "CLANG_RESOURCE_DIR": .plString(clangResourceDir.str), // Resource dir for linking C/C++/Obj-C
+                        "SDKROOT": .plString(sysroot.str),
+                        "OTHER_LDFLAGS": .plArray(["$(inherited)"] + extraSwiftCompilerSettings.map( {.plString($0)} )), // The extra swift compiler settings in JSON are intended to go to the linker driver too
+                    ]),
+                    "SupportedTargets": .plDict([
+                        platform.name: .plDict([
+                            "Archs": .plArray([.plString(llvmTriple.arch)]),
+                            "LLVMTargetTripleEnvironment": .plString(llvmTriple.environment ?? ""),
+                            "LLVMTargetTripleSys": .plString(tripleSystem),
+                            "LLVMTargetTripleVendor": .plString(llvmTriple.vendor),
+                        ])
+                    ]),
+                    // TODO: Leave compatible toolchain information in Swift SDKs
+                    // "Toolchains": .plArray([])
+                ]))
+
+                if let sdk {
+                    try sdk.loadExtendedInfo(delegate.namespace)
+                    sdksByPath[Path(sdkManifestPath)] = sdk
+                    return sdk
+                }
+            }
+        }
+
+        return nil
+    }
+
     public func lookup(nameOrPath key: String, basePath: Path, activeRunDestination: RunDestinationInfo?) throws -> SDK? {
         #if !os(Windows)
         // TODO: Turn this validation back on once our path handling is cleaned up a bit more
diff --git a/Sources/SWBCore/Settings/Settings.swift b/Sources/SWBCore/Settings/Settings.swift
index cc6f3283..24c20d7b 100644
--- a/Sources/SWBCore/Settings/Settings.swift
+++ b/Sources/SWBCore/Settings/Settings.swift
@@ -1803,11 +1803,24 @@ private class SettingsBuilder: ProjectMatchLookup {
             }
 
             do {
-                sdk = try project.map { try sdkRegistry.lookup(nameOrPath: sdkroot, basePath: $0.sourceRoot, activeRunDestination: parameters.activeRunDestination) } ?? nil
+                sdk = try project.map {
+                    switch parameters.activeRunDestination?.buildTarget {
+                    case let .swiftSDK(sdkManifestPath: sdkManifestPath, triple: triple):
+                        // FIXME platform should be decided by the triple
+                        guard let platform = core.platformRegistry.lookup(name: "webassembly") else {
+                            errors.append("unable to find platform 'webassembly'")
+                            return nil
+                        }
+                        return try sdkRegistry.synthesizedSDK(platform: platform, sdkManifestPath: sdkManifestPath, triple: triple)
+                    default:
+                        return try sdkRegistry.lookup(nameOrPath: sdkroot, basePath: $0.sourceRoot, activeRunDestination: parameters.activeRunDestination)
+                    }
+                } ?? nil
             } catch {
                 sdk = nil
                 sdkLookupErrors.append(error)
             }
+
             if let s = sdk {
                 // Evaluate the SDK variant, if there is one.
                 let sdkVariantName: String
@@ -3512,23 +3525,46 @@ private class SettingsBuilder: ProjectMatchLookup {
 
         // Destination info: since runDestination.{platform,sdk} were set by the IDE, we expect them to resolve in Swift Build correctly
         guard let runDestination = self.parameters.activeRunDestination else { return }
-        guard let destinationPlatform: Platform = self.core.platformRegistry.lookup(name: runDestination.platform) else {
-            self.errors.append("unable to resolve run destination platform: '\(runDestination.platform)'")
-            return
-        }
+
+        let destinationPlatform: Platform
         let destinationSDK: SDK
-        do {
-            guard let sdk = try sdkRegistry.lookup(runDestination.sdk, activeRunDestination: runDestination) else {
-                self.errors.append("unable to resolve run destination SDK: '\(runDestination.sdk)'")
+        switch runDestination.buildTarget {
+        case let .swiftSDK(sdkManifestPath: sdkManifestPath, triple: triple):
+            // FIXME: the platform should be determined using the triple
+            guard let platform = self.core.platformRegistry.lookup(name: "webassembly") else {
+                self.errors.append("unable to resolve run destination platform: 'webassembly'")
+                return
+            }
+
+            destinationPlatform = platform
+
+            guard let sdk = try? sdkRegistry.synthesizedSDK(platform: platform, sdkManifestPath: sdkManifestPath, triple: triple) else {
+                self.errors.append("unable to synthesize SDK for Swift SDK build target: '\(runDestination.buildTarget)'")
                 return
             }
             destinationSDK = sdk
-        } catch let error as AmbiguousSDKLookupError {
-            self.diagnostics.append(error.diagnostic)
-            return
-        } catch {
-            self.errors.append("\(error)")
-            return
+        default:
+            guard let platform = self.core.platformRegistry.lookup(name: runDestination.platform) else {
+                self.errors.append("unable to resolve run destination platform: '\(runDestination.platform)'")
+                return
+            }
+
+            destinationPlatform = platform
+
+            do {
+                if let sdk = try sdkRegistry.lookup(runDestination.sdk, activeRunDestination: runDestination) {
+                    destinationSDK = sdk
+                } else {
+                    self.errors.append("unable to resolve run destination SDK: '\(runDestination.sdk)'")
+                    return
+                }
+            } catch let error as AmbiguousSDKLookupError {
+                self.diagnostics.append(error.diagnostic)
+                return
+            } catch {
+                self.errors.append("\(error)")
+                return
+            }
         }
 
         let destinationPlatformIsMacOS = destinationPlatform.name == "macosx"
@@ -3639,9 +3675,23 @@ private class SettingsBuilder: ProjectMatchLookup {
 
         // Destination info: since runDestination.{platform,sdk} were set by the IDE, we expect them to resolve in Swift Build correctly
         guard let runDestination = self.parameters.activeRunDestination else { return }
-        guard let destinationPlatform: Platform = self.core.platformRegistry.lookup(name: runDestination.platform) else {
-            self.errors.append("unable to resolve run destination platform: '\(runDestination.platform)'")
-            return
+
+        let destinationPlatform: Platform
+
+        switch runDestination.buildTarget {
+        case .swiftSDK:
+            // TODO use the triple to decide the platform, or use a fallback
+            guard let platform: Platform = self.core.platformRegistry.lookup(name: "webassembly") else {
+                self.errors.append("unable to resolve run destination platform: '\(runDestination.platform)'")
+                return
+            }
+            destinationPlatform = platform
+        default:
+            guard let platform: Platform = self.core.platformRegistry.lookup(name: runDestination.platform) else {
+                self.errors.append("unable to resolve run destination platform: '\(runDestination.platform)'")
+                return
+            }
+            destinationPlatform = platform
         }
 
         // Target info
diff --git a/Sources/SWBCore/SwiftSDK.swift b/Sources/SWBCore/SwiftSDK.swift
index c8f7f43f..7edbb71b 100644
--- a/Sources/SWBCore/SwiftSDK.swift
+++ b/Sources/SWBCore/SwiftSDK.swift
@@ -25,22 +25,53 @@ public struct SwiftSDK: Sendable {
         public var sdkRootPath: String
         public var swiftResourcesPath: String?
         public var swiftStaticResourcesPath: String?
+        public var clangResourcesPath: String? {
+            guard let swiftResourcesPath = self.swiftResourcesPath else {
+                return nil
+            }
+
+            // The clang resource path is conventionally the clang subdirectory of the swift resource path
+            return Path(swiftResourcesPath).join("clang").str
+        }
+        public var clangStaticResourcesPath: String? {
+            guard let swiftResourcesPath = self.swiftStaticResourcesPath else {
+                return nil
+            }
+
+            // The clang resource path is conventionally the clang subdirectory of the swift resource path
+            return Path(swiftResourcesPath).join("clang").str
+        }
         public var includeSearchPaths: [String]?
         public var librarySearchPaths: [String]?
         public var toolsetPaths: [String]?
+
+        public func loadToolsets(sdk: SwiftSDK, fs: any FSProxy) throws -> [Toolset] {
+            var toolsets: [Toolset] = []
+
+            for toolsetPath in self.toolsetPaths ?? [] {
+                let metadataData = try Data(fs.read(sdk.path.join(toolsetPath)))
+
+                let schema = try JSONDecoder().decode(SchemaVersionInfo.self, from: metadataData)
+                guard schema.schemaVersion == "1.0" else { return [] } // FIXME throw an error
+
+                let toolset = try JSONDecoder().decode(Toolset.self, from: metadataData)
+                toolsets.append(toolset)
+            }
+
+            return toolsets
+        }
     }
     struct MetadataV4: Codable {
         let targetTriples: [String: TripleProperties]
     }
 
-    struct Toolset: Codable {
-        struct ToolProperties: Codable {
-            var path: String?
-            var extraCLIOptions: [String]
+    public struct Toolset: Codable {
+        public struct Tool: Codable {
+            public let extraCLIOptions: [String]?
         }
 
-        var knownTools: [String: ToolProperties] = [:]
-        var rootPaths: [String] = []
+        public let rootPath: String
+        public let swiftCompiler: Tool?
     }
 
     /// The identifier of the artifact bundle containing this SDK.
@@ -55,12 +86,11 @@ public struct SwiftSDK: Sendable {
     init?(identifier: String, version: String, path: Path, fs: any FSProxy) throws {
         self.identifier = identifier
         self.version = version
-        self.path = path
+        self.path = path.dirname
 
-        let metadataPath = path.join("swift-sdk.json")
-        guard fs.exists(metadataPath) else { return nil }
+        guard fs.exists(path) else { return nil }
 
-        let metadataData = try Data(fs.read(metadataPath))
+        let metadataData = try Data(fs.read(path))
         let schema = try JSONDecoder().decode(SchemaVersionInfo.self, from: metadataData)
         guard schema.schemaVersion == "4.0" else { return nil }
 
@@ -118,7 +148,7 @@ public struct SwiftSDK: Sendable {
     }
 
     /// Find Swift SDKs in an artifact bundle supporting one of the given targets.
-    private static func findSDKs(artifactBundle: Path, targetTriples: [String]?, fs: any FSProxy) throws -> [SwiftSDK] {
+    public static func findSDKs(artifactBundle: Path, targetTriples: [String]?, fs: any FSProxy) throws -> [SwiftSDK] {
         // Load info.json from the artifact bundle
         let infoPath = artifactBundle.join("info.json")
         guard try fs.isFile(infoPath) else { return [] }
diff --git a/Sources/SWBCore/WorkspaceContext.swift b/Sources/SWBCore/WorkspaceContext.swift
index 5f0e4f6b..1b8a3cc5 100644
--- a/Sources/SWBCore/WorkspaceContext.swift
+++ b/Sources/SWBCore/WorkspaceContext.swift
@@ -213,6 +213,10 @@ public struct WorkspaceContextSDKRegistry: SDKRegistryLookup, Sendable {
         public func lookup(nameOrPath: String, basePath: Path, activeRunDestination: RunDestinationInfo?) throws -> SDK? {
             return try lookupInEach { try $0.lookup(nameOrPath: nameOrPath, basePath: basePath, activeRunDestination: activeRunDestination) }
         }
+
+        func synthesizedSDK(platform: Platform, sdkManifestPath: String, triple: String) throws -> SDK? {
+            return try lookupInEach { try $0.synthesizedSDK(platform: platform, sdkManifestPath: sdkManifestPath, triple: triple) }
+        }
     }
 
     @_spi(Testing) public init(coreSDKRegistry: SDKRegistry, delegate: any SDKRegistryDelegate, userNamespace: MacroNamespace, overridingSDKsDir: Path?) {
@@ -246,6 +250,10 @@ public struct WorkspaceContextSDKRegistry: SDKRegistryLookup, Sendable {
     public func lookup(nameOrPath: String, basePath: Path, activeRunDestination: RunDestinationInfo?) throws -> SDK? {
         return try underlyingLookup.lookup(nameOrPath: nameOrPath, basePath: basePath, activeRunDestination: activeRunDestination)
     }
+
+    public func synthesizedSDK(platform: Platform, sdkManifestPath: String, triple: String) throws -> SDK? {
+        return try underlyingLookup.synthesizedSDK(platform: platform, sdkManifestPath: sdkManifestPath, triple: triple)
+    }
 }
 
 /// Wrapper for information needed to use a workspace.
diff --git a/Sources/SWBProtocol/MessageSupport.swift b/Sources/SWBProtocol/MessageSupport.swift
index 65e79bfc..5124c9e2 100644
--- a/Sources/SWBProtocol/MessageSupport.swift
+++ b/Sources/SWBProtocol/MessageSupport.swift
@@ -318,13 +318,16 @@ public struct BuildParametersMessagePayload: SerializableCodable, Equatable, Sen
 }
 
 public struct RunDestinationInfo: SerializableCodable, Hashable, Sendable {
+    public var disableOnlyActiveArch: Bool
+    public var hostTargetedPlatform: String?
+
+    public var buildTarget: BuildTarget?
+
     public var platform: String
     public var sdk: String
     public var sdkVariant: String?
     public var targetArchitecture: String
     public var supportedArchitectures: OrderedSet<String>
-    public var disableOnlyActiveArch: Bool
-    public var hostTargetedPlatform: String?
 
     public init(platform: String, sdk: String, sdkVariant: String?, targetArchitecture: String, supportedArchitectures: OrderedSet<String>, disableOnlyActiveArch: Bool, hostTargetedPlatform: String?) {
         self.platform = platform
@@ -334,7 +337,23 @@ public struct RunDestinationInfo: SerializableCodable, Hashable, Sendable {
         self.supportedArchitectures = supportedArchitectures
         self.disableOnlyActiveArch = disableOnlyActiveArch
         self.hostTargetedPlatform = hostTargetedPlatform
+        self.buildTarget = nil
     }
+
+    public init(buildTarget: BuildTarget, disableOnlyActiveArch: Bool, hostTargetedPlatform: String? = nil) {
+        self.platform = ""
+        self.sdk = ""
+        self.sdkVariant = nil
+        self.targetArchitecture = ""
+        self.supportedArchitectures = []
+        self.buildTarget = buildTarget
+        self.disableOnlyActiveArch = disableOnlyActiveArch
+        self.hostTargetedPlatform = hostTargetedPlatform
+    }
+}
+
+public enum BuildTarget: SerializableCodable, Hashable, Sendable {
+    case swiftSDK(sdkManifestPath: String, triple: String)
 }
 
 /// The arena info being sent in a Message.
diff --git a/Sources/SWBUniversalPlatform/Specs/Ld.xcspec b/Sources/SWBUniversalPlatform/Specs/Ld.xcspec
index 40022fee..362585fc 100644
--- a/Sources/SWBUniversalPlatform/Specs/Ld.xcspec
+++ b/Sources/SWBUniversalPlatform/Specs/Ld.xcspec
@@ -173,6 +173,27 @@
                 CommandLineFlag = "-sdk";
                 IsInputDependency = Yes;
             },
+            {
+                Name = CLANG_RESOURCE_DIR;
+                Type = Path;
+                Condition = "$(LINKER_DRIVER) == clang";
+                CommandLineFlag = "-resource-dir";
+                IsInputDependency = Yes;
+            },
+            {
+                Name = CLANG_RESOURCE_DIR;
+                Type = Path;
+                Condition = "$(LINKER_DRIVER) == swiftc";
+                CommandLineArgs = ("-Xclang-linker", "-resource-dir", "-Xclang-linker", "$(CLANG_RESOURCE_DIR)");
+                IsInputDependency = Yes;
+            },
+            {
+                Name = SWIFTC_RESOURCE_DIR;
+                Type = Path;
+                Condition = "$(LINKER_DRIVER) == swiftc";
+                CommandLineArgs = ("-resource-dir", "$(SWIFTC_RESOURCE_DIR)");
+                IsInputDependency = Yes;
+            },
             {
                 Name = "LD_OPTIMIZATION_LEVEL";
                 Type = String;
diff --git a/Sources/SWBWebAssemblyPlatform/Specs/WasmLd.xcspec b/Sources/SWBWebAssemblyPlatform/Specs/WasmLd.xcspec
index ba106172..dc6ba13a 100644
--- a/Sources/SWBWebAssemblyPlatform/Specs/WasmLd.xcspec
+++ b/Sources/SWBWebAssemblyPlatform/Specs/WasmLd.xcspec
@@ -52,6 +52,14 @@
                 DefaultValue = "";
                 Condition = "NO";
             },
+            {
+                // Wasm doesn't have search paths
+                Name = "LD_RUNPATH_SEARCH_PATHS";
+                //Note: Cannot be of type 'PathList' as value is used with relative '../' paths
+                Type = StringList;
+                Condition = "NO";
+                CommandLineArgs = ();
+            },
             {
                 Name = GOLD_BUILDID;
                 Type = Boolean;
@@ -129,6 +137,14 @@
                 Type = Path;
                 DefaultValue = "";
             },
+            {
+                Name = SWIFTC_SDKROOT_LINKER_INPUT;
+                Type = Path;
+                DefaultValue = "$(SYSROOT:default=$(SDKROOT))";
+                Condition = "$(LINKER_DRIVER) == swiftc";
+                CommandLineFlag = "-sdk";
+                IsInputDependency = Yes;
+            },
             {
                 Name = "__INPUT_FILE_LIST_PATH__";
                 Type = Path;
diff --git a/Sources/SWBWebAssemblyPlatform/Specs/WebAssembly.xcspec b/Sources/SWBWebAssemblyPlatform/Specs/WebAssembly.xcspec
index b7cfeaf8..5a30bd12 100644
--- a/Sources/SWBWebAssemblyPlatform/Specs/WebAssembly.xcspec
+++ b/Sources/SWBWebAssemblyPlatform/Specs/WebAssembly.xcspec
@@ -23,4 +23,10 @@
         );
         SortNumber = 0;
     },
+    {
+        Domain = webassembly;
+        Type = ProductType;
+        Identifier = org.swift.product-type.common.object;
+        BasedOn = com.apple.product-type.library.static;
+    },
 )
diff --git a/Sources/SwiftBuild/SWBBuildParameters.swift b/Sources/SwiftBuild/SWBBuildParameters.swift
index 11d07745..c3a8ca81 100644
--- a/Sources/SwiftBuild/SWBBuildParameters.swift
+++ b/Sources/SwiftBuild/SWBBuildParameters.swift
@@ -36,13 +36,47 @@ public struct SWBBuildParameters: Codable, Sendable {
 
 /// Refer to `SWBProtocol.RunDestinationInfo`
 public struct SWBRunDestinationInfo: Codable, Sendable {
+    public enum SWBBuildTarget: Codable, Sendable {
+        case appleSDK(platform: String, sdk: String, sdkVariant: String?, targetArchitecture: String, supportedArchitectures: [String])
+        case swiftSDK(sdkManifestPath: String, triple: String)
+    }
+    public var disableOnlyActiveArch: Bool
+    public var hostTargetedPlatform: String?
+
+    public var _internalBuildTarget: SWBBuildTarget?
+
+    public var buildTarget: SWBBuildTarget {
+        get {
+            if let bt = _internalBuildTarget {
+                return bt
+            }
+
+            return .appleSDK(platform: self.platform, sdk: self.sdk, sdkVariant: self.sdkVariant, targetArchitecture: self.targetArchitecture, supportedArchitectures: self.supportedArchitectures)
+        }
+        set {
+            switch newValue {
+            case let .appleSDK(platform: platform, sdk: sdk, sdkVariant: sdkVariant, targetArchitecture: targetArchitecture, supportedArchitectures: supportedArchitectures):
+                self.platform = platform
+                self.sdk = sdk
+                self.sdkVariant = sdkVariant
+                self.targetArchitecture = targetArchitecture
+                self.supportedArchitectures = supportedArchitectures
+            case .swiftSDK:
+                self._internalBuildTarget = newValue
+                self.platform = ""
+                self.sdk = ""
+                self.sdkVariant = nil
+                self.targetArchitecture = ""
+                self.supportedArchitectures = []
+            }
+        }
+    }
+
     public var platform: String
     public var sdk: String
     public var sdkVariant: String?
     public var targetArchitecture: String
     public var supportedArchitectures: [String]
-    public var disableOnlyActiveArch: Bool
-    public var hostTargetedPlatform: String?
 
     public init(platform: String, sdk: String, sdkVariant: String?, targetArchitecture: String, supportedArchitectures: [String], disableOnlyActiveArch: Bool) {
         self.platform = platform
@@ -53,6 +87,27 @@ public struct SWBRunDestinationInfo: Codable, Sendable {
         self.disableOnlyActiveArch = disableOnlyActiveArch
     }
 
+    public init(buildTarget: SWBBuildTarget, disableOnlyActiveArch: Bool, hostTargetedPlatform: String? = nil) {
+        switch buildTarget {
+        case let .appleSDK(platform: platform, sdk: sdk, sdkVariant: sdkVariant, targetArchitecture: targetArchitecture, supportedArchitectures: supportedArchitectures):
+            self.platform = platform
+            self.sdk = sdk
+            self.sdkVariant = sdkVariant
+            self.targetArchitecture = targetArchitecture
+            self.supportedArchitectures = supportedArchitectures
+            break
+        case .swiftSDK:
+            self._internalBuildTarget = buildTarget
+            self.platform = ""
+            self.sdk = ""
+            self.sdkVariant = nil
+            self.targetArchitecture = ""
+            self.supportedArchitectures = []
+        }
+        self.disableOnlyActiveArch = disableOnlyActiveArch
+        self.hostTargetedPlatform = hostTargetedPlatform
+    }
+
     public init(platform: String, sdk: String, sdkVariant: String?, targetArchitecture: String, supportedArchitectures: [String], disableOnlyActiveArch: Bool, hostTargetedPlatform: String?) {
         self.init(platform: platform, sdk: sdk, sdkVariant: sdkVariant, targetArchitecture: targetArchitecture, supportedArchitectures: supportedArchitectures, disableOnlyActiveArch: disableOnlyActiveArch)
         self.hostTargetedPlatform = hostTargetedPlatform
diff --git a/Sources/SwiftBuild/SWBBuildServiceSession.swift b/Sources/SwiftBuild/SWBBuildServiceSession.swift
index b86e3a52..dcd31b87 100644
--- a/Sources/SwiftBuild/SWBBuildServiceSession.swift
+++ b/Sources/SwiftBuild/SWBBuildServiceSession.swift
@@ -838,7 +838,12 @@ extension SWBBuildParameters {
 
 fileprivate extension RunDestinationInfo {
     init(_ x: SWBRunDestinationInfo) {
-        self.init(platform: x.platform, sdk: x.sdk, sdkVariant: x.sdkVariant, targetArchitecture: x.targetArchitecture, supportedArchitectures: OrderedSet(x.supportedArchitectures), disableOnlyActiveArch: x.disableOnlyActiveArch, hostTargetedPlatform: x.hostTargetedPlatform)
+        switch x.buildTarget {
+        case .appleSDK:
+            self.init(platform: x.platform, sdk: x.sdk, sdkVariant: x.sdkVariant, targetArchitecture: x.targetArchitecture, supportedArchitectures: OrderedSet(x.supportedArchitectures), disableOnlyActiveArch: x.disableOnlyActiveArch, hostTargetedPlatform: x.hostTargetedPlatform)
+        case let .swiftSDK(sdkManifestPath: sdkManifestPath, triple: triple):
+            self.init(buildTarget: .swiftSDK(sdkManifestPath: sdkManifestPath, triple: triple), disableOnlyActiveArch: x.disableOnlyActiveArch, hostTargetedPlatform: x.hostTargetedPlatform)
+        }
     }
 }