We can not import SwiftBuild on all platforms

Author: pmattos

Sources/SwiftBuildSupport/PackagePIFBuilder+Helpers.swift

@@ -55,6 +55,7 @@ import struct PackageGraph.ResolvedProduct
 
 import func PackageLoading.pkgConfigArgs
 
+#if canImport(SwiftBuild)
 import enum SwiftBuild.PIF
 
 // MARK: - PIF GUID Helpers
@@ -1106,3 +1107,5 @@ extension UserDefaults {
         }
     }
 }
+
+#endif

Sources/SwiftBuildSupport/PackagePIFBuilder+Plugins.swift

@@ -17,6 +17,7 @@ import let Basics.localFileSystem
 import enum Basics.Sandbox
 import struct Basics.SourceControlURL
 
+#if canImport(SwiftBuild)
 import enum SwiftBuild.PIF
 
 extension PIFPackageBuilder {
@@ -132,3 +133,5 @@ extension PIFPackageBuilder {
         }
     }
 }
+
+#endif

Sources/SwiftBuildSupport/PackagePIFBuilder.swift

@@ -30,6 +30,7 @@ import struct PackageGraph.ModulesGraph
 import struct PackageGraph.ResolvedModule
 import struct PackageGraph.ResolvedPackage
 
+#if canImport(SwiftBuild)
 import enum SwiftBuild.PIF
 
 /// A builder for generating the PIF object from a package.
@@ -668,3 +669,5 @@ public struct SourceLocation: Sendable {
         self.line = line
     }
 }
+
+#endif

Sources/SwiftBuildSupport/PackagePIFProjectBuilder+Modules.swift

@@ -25,6 +25,7 @@ import class PackageModel.SystemLibraryModule
 import struct PackageGraph.ResolvedModule
 import struct PackageGraph.ResolvedPackage
 
+#if canImport(SwiftBuild)
 import enum SwiftBuild.PIF
 
 /// Extension to create PIF **modules** for a given package.
@@ -814,3 +815,4 @@ extension PackagePIFProjectBuilder {
         self.builtModulesAndProducts.append(systemModule)
     }
 }
+#endif

Sources/SwiftBuildSupport/PackagePIFProjectBuilder+Products.swift

@@ -27,6 +27,7 @@ import struct PackageGraph.ResolvedModule
 import struct PackageGraph.ResolvedPackage
 import struct PackageGraph.ResolvedProduct
 
+#if canImport(SwiftBuild)
 import enum SwiftBuild.PIF
 
 /// Extension to create PIF **products** for a given package.
@@ -896,3 +897,5 @@ private struct PackageRegistrySignature: Encodable {
     let source: Source
     let formatVersion = 2
 }
+
+#endif

Sources/SwiftBuildSupport/PackagePIFProjectBuilder.swift

@@ -30,6 +30,7 @@ import struct PackageGraph.ResolvedPackage
 import struct PackageLoading.FileRuleDescription
 import struct PackageLoading.TargetSourcesBuilder
 
+#if canImport(SwiftBuild)
 import enum SwiftBuild.PIF
 import struct SwiftBuild.SwiftBuildFileType
 
@@ -477,3 +478,5 @@ struct PackagePIFProjectBuilder {
         !self.dynamicLibraryProductNames.contains(targetName)
     }
 }
+
+#endif