Exclude XCBuildSupport when building with CMake (#7358)

XCBuildSupport is not available on non-Darwin platforms, especially
Windows, where we have to have full CMake support at the moment.
Maintaining XCBuildSupport in these unsupported configurations adds
unnecessary overhead, especially in cases like
#7258, where we have
to add new dependencies only when `XCBuildSupport` is available. We
should exclude from CMake builds to reduce this maintenance overhead.

Author: MaxDesiatov

Sources/CMakeLists.txt

@@ -37,4 +37,3 @@ add_subdirectory(swift-package)
 add_subdirectory(swift-run)
 add_subdirectory(swift-test)
 add_subdirectory(Workspace)
-add_subdirectory(XCBuildSupport)

Sources/Commands/CMakeLists.txt

@@ -59,8 +59,11 @@ target_link_libraries(Commands PUBLIC
   SourceControl
   TSCBasic
   TSCUtility
-  Workspace
-  XCBuildSupport)
+  Workspace)
+
+target_compile_definitions(Commands
+  PRIVATE DISABLE_XCBUILD_SUPPORT)
+
 target_link_libraries(Commands PRIVATE
   DriverSupport
   $<$<NOT:$<PLATFORM_ID:Darwin>>:FoundationXML>)

Sources/Commands/PackageTools/DumpCommands.swift

@@ -15,7 +15,10 @@ import Basics
 import CoreCommands
 import Foundation
 import PackageModel
+
+#if !DISABLE_XCBUILD_SUPPORT
 import XCBuildSupport
+#endif
 
 struct DumpSymbolGraph: SwiftCommand {
     static let configuration = CommandConfiguration(
@@ -136,6 +139,7 @@ struct DumpPIF: SwiftCommand {
     var preserveStructure: Bool = false
 
     func run(_ swiftTool: SwiftTool) throws {
+        #if !DISABLE_XCBUILD_SUPPORT
         let graph = try swiftTool.loadPackageGraph()
         let pif = try PIFBuilder.generatePIF(
             buildParameters: swiftTool.productsBuildParameters,
@@ -144,6 +148,9 @@ struct DumpPIF: SwiftCommand {
             observabilityScope: swiftTool.observabilityScope,
             preservePIFModelStructure: preserveStructure)
         print(pif)
+        #else
+        fatalError("This subcommand is not available on the current platform")
+        #endif
     }
 
     var toolWorkspaceConfiguration: ToolWorkspaceConfiguration {

Sources/Commands/PackageTools/SwiftPackageTool.swift

@@ -20,7 +20,10 @@ import PackageModel
 import SourceControl
 import SPMBuildCore
 import Workspace
+
+#if !DISABLE_XCBUILD_SUPPORT
 import XCBuildSupport
+#endif
 
 import enum TSCUtility.Diagnostics
 

Sources/Commands/SwiftBuildTool.swift

@@ -16,7 +16,10 @@ import Build
 import CoreCommands
 import PackageGraph
 import SPMBuildCore
+
+#if !DISABLE_XCBUILD_SUPPORT
 import XCBuildSupport
+#endif
 
 import class TSCBasic.Process
 import var TSCBasic.stdoutStream

Sources/CoreCommands/BuildSystemSupport.swift

@@ -12,7 +12,10 @@
 
 import Build
 import SPMBuildCore
+
+#if !DISABLE_XCBUILD_SUPPORT
 import XCBuildSupport
+#endif
 
 import class Basics.ObservabilityScope
 import struct PackageGraph.PackageGraph
@@ -60,6 +63,7 @@ private struct NativeBuildSystemFactory: BuildSystemFactory {
     }
 }
 
+#if !DISABLE_XCBUILD_SUPPORT
 private struct XcodeBuildSystemFactory: BuildSystemFactory {
     let swiftTool: SwiftTool
 
@@ -87,12 +91,19 @@ private struct XcodeBuildSystemFactory: BuildSystemFactory {
         )
     }
 }
+#endif
 
 extension SwiftTool {
     public var defaultBuildSystemProvider: BuildSystemProvider {
+        #if !DISABLE_XCBUILD_SUPPORT
         .init(providers: [
             .native: NativeBuildSystemFactory(swiftTool: self),
             .xcode: XcodeBuildSystemFactory(swiftTool: self)
         ])
+        #else
+        .init(providers: [
+            .native: NativeBuildSystemFactory(swiftTool: self),
+        ])
+        #endif
     }
 }

Sources/CoreCommands/CMakeLists.txt

@@ -18,8 +18,11 @@ target_link_libraries(CoreCommands PUBLIC
   PackageGraph
   TSCBasic
   TSCUtility
-  Workspace
-  XCBuildSupport)
+  Workspace)
+
+target_compile_definitions(CoreCommands
+  PRIVATE DISABLE_XCBUILD_SUPPORT)
+
 target_link_libraries(CoreCommands PRIVATE
   DriverSupport
   $<$<NOT:$<PLATFORM_ID:Darwin>>:FoundationXML>)

Sources/XCBuildSupport/CMakeLists.txt

@@ -16,5 +16,7 @@ target_link_libraries(swift-bootstrap PRIVATE
   PackageLoading
   PackageModel
   TSCBasic
-  TSCUtility
-  XCBuildSupport)
+  TSCUtility)
+
+target_compile_definitions(swift-bootstrap
+  PRIVATE DISABLE_XCBUILD_SUPPORT)

Sources/swift-bootstrap/CMakeLists.txt

@@ -20,7 +20,10 @@ import PackageGraph
 import PackageLoading
 import PackageModel
 import SPMBuildCore
+
+#if !DISABLE_XCBUILD_SUPPORT
 import XCBuildSupport
+#endif
 
 import struct TSCBasic.KeyedPair
 import func TSCBasic.topologicalSort
@@ -322,6 +325,7 @@ struct SwiftBootstrapBuildTool: ParsableCommand {
                     observabilityScope: self.observabilityScope
                 )
             case .xcode:
+                #if !DISABLE_XCBUILD_SUPPORT
                 return try XcodeBuildSystem(
                     buildParameters: buildParameters,
                     packageGraphLoader: packageGraphLoader,
@@ -330,6 +334,9 @@ struct SwiftBootstrapBuildTool: ParsableCommand {
                     fileSystem: self.fileSystem,
                     observabilityScope: self.observabilityScope
                 )
+                #else
+                fatalError("SwiftPM was built without XCBuild support")
+                #endif
             }
         }