Use host triple in createIndexStoreAPI

Author: MaxDesiatov

Sources/Build/BuildDelegate.swift

@@ -262,7 +262,7 @@ public final class BuildExecutionContext {
     private var indexStoreAPICache = LazyCache(createIndexStoreAPI)
     private func createIndexStoreAPI() -> Result<IndexStoreAPI, Error> {
         Result {
-            let ext = buildParameters.triple.dynamicLibraryExtension
+            let ext = buildParameters.hostTriple.dynamicLibraryExtension
             let indexStoreLib = buildParameters.toolchain.toolchainLibDir.appending(component: "libIndexStore" + ext)
             return try IndexStoreAPI(dylib: indexStoreLib)
         }

Sources/SPMBuildCore/BuildParameters.swift

@@ -46,6 +46,9 @@ public struct BuildParameters: Encodable {
     public var toolchain: Toolchain { _toolchain.toolchain }
     private let _toolchain: _Toolchain
 
+    /// Host triple.
+    public var hostTriple: Triple
+
     /// Destination triple.
     public var triple: Triple
 
@@ -144,6 +147,7 @@ public struct BuildParameters: Encodable {
         self.dataPath = dataPath
         self.configuration = configuration
         self._toolchain = _Toolchain(toolchain: toolchain)
+        self.hostTriple = .getHostTriple(usingSwiftCompiler: toolchain.swiftCompiler)
         self.triple = destinationTriple ?? .getHostTriple(usingSwiftCompiler: toolchain.swiftCompiler)
         self.flags = flags
         self.xcbuildFlags = xcbuildFlags