Hide build system internals with @_spi (swiftlang#7365)

These details should not leak outside of the SwiftPM package. In the
(hopefully temporary) absence of `package` access control, we can hide
build system-related APIs with `@_spi` annotations.

Author: MaxDesiatov

Sources/Build/BuildOperation.swift

@@ -12,11 +12,18 @@
 
 @_spi(SwiftPMInternal)
 import Basics
+
+@_spi(SwiftPMInternal)
+import Build
+
 import LLBuildManifest
 import PackageGraph
 import PackageLoading
 import PackageModel
+
+@_spi(SwiftPMInternal)
 import SPMBuildCore
+
 import SPMLLBuild
 import Foundation
 
@@ -36,6 +43,7 @@ import DriverSupport
 import SwiftDriver
 #endif
 
+@_spi(SwiftPMInternal)
 public final class BuildOperation: PackageStructureDelegate, SPMBuildCore.BuildSystem, BuildErrorAdviceProvider {
     /// The delegate used by the build system.
     public weak var delegate: SPMBuildCore.BuildSystemDelegate?

Sources/Build/BuildOperationBuildSystemDelegateHandler.swift

@@ -16,7 +16,10 @@ import Dispatch
 import Foundation
 import LLBuildManifest
 import PackageModel
+
+@_spi(SwiftPMInternal)
 import SPMBuildCore
+
 import SPMLLBuild
 
 import struct TSCBasic.ByteString

Sources/Commands/CommandWorkspaceDelegate.swift

@@ -11,7 +11,10 @@
 //===----------------------------------------------------------------------===//
 
 import Basics
+
+@_spi(SwiftPMInternal)
 import CoreCommands
+
 import Dispatch
 import class Foundation.NSLock
 import struct Foundation.URL

Sources/Commands/PackageCommands/APIDiff.swift

@@ -12,12 +12,18 @@
 
 import ArgumentParser
 import Basics
+
+@_spi(SwiftPMInternal)
 import CoreCommands
+
 import Dispatch
 import PackageGraph
 import PackageModel
 import SourceControl
 
+@_spi(SwiftPMInternal)
+import SPMBuildCore
+
 struct DeprecatedAPIDiff: ParsableCommand {
     static let configuration = CommandConfiguration(commandName: "experimental-api-diff",
                                                     abstract: "Deprecated - use `swift package diagnose-api-breaking-changes` instead",

Sources/Commands/PackageCommands/ArchiveSource.swift

@@ -12,7 +12,10 @@
 
 import ArgumentParser
 import Basics
+
+@_spi(SwiftPMInternal)
 import CoreCommands
+
 import SourceControl
 
 extension SwiftPackageCommand {

Sources/Commands/PackageCommands/CompletionCommand.swift

@@ -11,6 +11,8 @@
 //===----------------------------------------------------------------------===//
 
 import ArgumentParser
+
+@_spi(SwiftPMInternal)
 import CoreCommands
 
 import var TSCBasic.stdoutStream

Sources/Commands/PackageCommands/ComputeChecksum.swift

@@ -12,7 +12,10 @@
 
 import ArgumentParser
 import Basics
+
+@_spi(SwiftPMInternal)
 import CoreCommands
+
 import Workspace
 
 import struct TSCBasic.SHA256

Sources/Commands/PackageCommands/Config.swift

@@ -12,7 +12,10 @@
 
 import ArgumentParser
 import Basics
+
+@_spi(SwiftPMInternal)
 import CoreCommands
+
 import Workspace
 
 import var TSCBasic.stderrStream

Sources/Commands/PackageCommands/Describe.swift

@@ -12,7 +12,10 @@
 
 import ArgumentParser
 import Basics
+
+@_spi(SwiftPMInternal)
 import CoreCommands
+
 import Foundation
 import PackageModel
 

Sources/Commands/PackageCommands/DumpCommands.swift

@@ -12,9 +12,16 @@
 
 import ArgumentParser
 import Basics
+
+@_spi(SwiftPMInternal)
 import CoreCommands
+
 import Foundation
 import PackageModel
+
+@_spi(SwiftPMInternal)
+import SPMBuildCore
+
 import XCBuildSupport
 
 struct DumpSymbolGraph: SwiftCommand {

Sources/Commands/PackageCommands/EditCommands.swift

@@ -12,7 +12,10 @@
 
 import ArgumentParser
 import Basics
+
+@_spi(SwiftPMInternal)
 import CoreCommands
+
 import SourceControl
 
 extension SwiftPackageCommand {

Sources/Commands/PackageCommands/Format.swift

@@ -12,7 +12,10 @@
 
 import ArgumentParser
 import Basics
+
+@_spi(SwiftPMInternal)
 import CoreCommands
+
 import PackageModel
 
 import class TSCBasic.Process

Sources/Commands/PackageCommands/Init.swift

@@ -12,7 +12,10 @@
 
 import ArgumentParser
 import Basics
+
+@_spi(SwiftPMInternal)
 import CoreCommands
+
 import Workspace
 import SPMBuildCore
 

Sources/Commands/PackageCommands/InstalledPackages.swift

@@ -11,9 +11,16 @@
 //===----------------------------------------------------------------------===//
 
 import ArgumentParser
+
+@_spi(SwiftPMInternal)
 import CoreCommands
+
 import Foundation
 import PackageModel
+
+@_spi(SwiftPMInternal)
+import SPMBuildCore
+
 import TSCBasic
 
 extension SwiftPackageCommand {

Sources/Commands/PackageCommands/Learn.swift

@@ -12,7 +12,10 @@
 
 import ArgumentParser
 import Basics
+
+@_spi(SwiftPMInternal)
 import CoreCommands
+
 import PackageGraph
 import PackageModel
 

Sources/Commands/PackageCommands/PluginCommand.swift

@@ -12,7 +12,13 @@
 
 import ArgumentParser
 import Basics
+
+@_spi(SwiftPMInternal)
 import CoreCommands
+
+@_spi(SwiftPMInternal)
+import SPMBuildCore
+
 import Dispatch
 import PackageGraph
 import PackageModel

Sources/Commands/PackageCommands/ResetCommands.swift

@@ -11,6 +11,8 @@
 //===----------------------------------------------------------------------===//
 
 import ArgumentParser
+
+@_spi(SwiftPMInternal)
 import CoreCommands
 
 extension SwiftPackageCommand {

Sources/Commands/PackageCommands/Resolve.swift

@@ -11,7 +11,10 @@
 //===----------------------------------------------------------------------===//
 
 import ArgumentParser
+
+@_spi(SwiftPMInternal)
 import CoreCommands
+
 import TSCUtility
 
 extension SwiftPackageCommand {

Sources/Commands/PackageCommands/ShowDependencies.swift

@@ -13,7 +13,10 @@
 
 import ArgumentParser
 import Basics
+
+@_spi(SwiftPMInternal)
 import CoreCommands
+
 import PackageGraph
 
 import class TSCBasic.LocalFileOutputByteStream

Sources/Commands/PackageCommands/SwiftPackageCommand.swift

@@ -12,7 +12,10 @@
 
 import ArgumentParser
 import Basics
+
+@_spi(SwiftPMInternal)
 import CoreCommands
+
 import Foundation
 import PackageGraph
 import PackageLoading

Sources/Commands/PackageCommands/ToolsVersionCommand.swift

@@ -11,7 +11,10 @@
 //===----------------------------------------------------------------------===//
 
 import ArgumentParser
+
+@_spi(SwiftPMInternal)
 import CoreCommands
+
 import PackageLoading
 import PackageModel
 import Workspace

Sources/Commands/PackageCommands/Update.swift

@@ -11,7 +11,10 @@
 //===----------------------------------------------------------------------===//
 
 import ArgumentParser
+
+@_spi(SwiftPMInternal)
 import CoreCommands
+
 import Dispatch
 import PackageModel
 import PackageGraph

Sources/Commands/Snippets/CardStack.swift

@@ -11,7 +11,10 @@
 //===----------------------------------------------------------------------===//
 
 import Basics
+
+@_spi(SwiftPMInternal)
 import CoreCommands
+
 import PackageGraph
 import PackageModel
 

Sources/Commands/Snippets/Cards/SnippetCard.swift

@@ -11,7 +11,14 @@
 //===----------------------------------------------------------------------===//
 
 import Basics
+
+@_spi(SwiftPMInternal)
 import CoreCommands
+
+
+@_spi(SwiftPMInternal)
+import SPMBuildCore
+
 import PackageModel
 
 import enum TSCBasic.ProcessEnv

Sources/Commands/Snippets/Cards/SnippetGroupCard.swift

@@ -10,7 +10,9 @@
 //
 //===----------------------------------------------------------------------===//
 
+@_spi(SwiftPMInternal)
 import CoreCommands
+
 import PackageModel
 
 /// A card showing the snippets in a ``SnippetGroup``.

Sources/Commands/Snippets/Cards/TopCard.swift

@@ -10,7 +10,10 @@
 //
 //===----------------------------------------------------------------------===//
 
+
+@_spi(SwiftPMInternal)
 import CoreCommands
+
 import Foundation
 import PackageModel
 import PackageGraph

Sources/Commands/SwiftBuildCommand.swift

@@ -12,9 +12,16 @@
 
 import ArgumentParser
 import Basics
+
+@_spi(SwiftPMInternal)
 import Build
+
+@_spi(SwiftPMInternal)
 import CoreCommands
+
 import PackageGraph
+
+@_spi(SwiftPMInternal)
 import SPMBuildCore
 import XCBuildSupport
 
@@ -92,6 +99,7 @@ struct BuildCommandOptions: ParsableArguments {
 }
 
 /// swift-build command namespace
+@_spi(SwiftPMInternal)
 public struct SwiftBuildCommand: AsyncSwiftCommand {
     public static var configuration = CommandConfiguration(
         commandName: "build",

Sources/Commands/SwiftRunCommand.swift

@@ -12,11 +12,17 @@
 
 import ArgumentParser
 import Basics
+
+@_spi(SwiftPMInternal)
 import CoreCommands
+
 import Foundation
 import PackageGraph
 import PackageModel
 
+@_spi(SwiftPMInternal)
+import SPMBuildCore
+
 import enum TSCBasic.ProcessEnv
 import func TSCBasic.exec
 
@@ -90,6 +96,7 @@ struct RunCommandOptions: ParsableArguments {
 }
 
 /// swift-run command namespace
+@_spi(SwiftPMInternal)
 public struct SwiftRunCommand: AsyncSwiftCommand {
     public static var configuration = CommandConfiguration(
         commandName: "run",