Revert "[Explicit Module Builds] Enable incremental dependency scanning"

Author: artemcm

Sources/SWBCore/Settings/BuiltinMacros.swift

@@ -1003,7 +1003,6 @@ public final class BuiltinMacros {
     public static let SWIFT_EMIT_MODULE_INTERFACE = BuiltinMacros.declareBooleanMacro("SWIFT_EMIT_MODULE_INTERFACE")
     public static let SWIFT_ENABLE_BATCH_MODE = BuiltinMacros.declareBooleanMacro("SWIFT_ENABLE_BATCH_MODE")
     public static let SWIFT_ENABLE_INCREMENTAL_COMPILATION = BuiltinMacros.declareBooleanMacro("SWIFT_ENABLE_INCREMENTAL_COMPILATION")
-    public static let SWIFT_DISABLE_INCREMENTAL_SCAN = BuiltinMacros.declareBooleanMacro("SWIFT_DISABLE_INCREMENTAL_SCAN")
     public static let SWIFT_ENABLE_LAYOUT_STRING_VALUE_WITNESSES = BuiltinMacros.declareBooleanMacro("SWIFT_ENABLE_LAYOUT_STRING_VALUE_WITNESSES")
     public static let SWIFT_ENABLE_LIBRARY_EVOLUTION = BuiltinMacros.declareBooleanMacro("SWIFT_ENABLE_LIBRARY_EVOLUTION")
     public static let SWIFT_ENABLE_BARE_SLASH_REGEX = BuiltinMacros.declareBooleanMacro("SWIFT_ENABLE_BARE_SLASH_REGEX")
@@ -2165,7 +2164,6 @@ public final class BuiltinMacros {
         SWIFT_EMIT_MODULE_INTERFACE,
         SWIFT_ENABLE_BATCH_MODE,
         SWIFT_ENABLE_INCREMENTAL_COMPILATION,
-        SWIFT_DISABLE_INCREMENTAL_SCAN,
         SWIFT_ENABLE_LAYOUT_STRING_VALUE_WITNESSES,
         SWIFT_ENABLE_LIBRARY_EVOLUTION,
         SWIFT_USE_INTEGRATED_DRIVER,

Sources/SWBCore/SpecImplementations/Tools/SwiftCompiler.swift

@@ -119,7 +119,6 @@ public struct SwiftSourceFileIndexingInfo: SourceFileIndexingInfo {
         "-emit-dependencies",
         "-serialize-diagnostics",
         "-incremental",
-        "-incremental-dependency-scan",
         "-parseable-output",
         "-use-frontend-parseable-output",
         "-whole-module-optimization",
@@ -154,7 +153,6 @@ public struct SwiftSourceFileIndexingInfo: SourceFileIndexingInfo {
     // can be removed after we use the new driver instead (rdar://75851402).
     private static let newDriverFlags: Set<ByteString> = [
         "-driver-print-graphviz",
-        "-incremental-dependency-scan",
         "-explicit-module-build",
         "-experimental-explicit-module-build",
         "-nonlib-dependency-scanner",
@@ -1745,10 +1743,6 @@ public final class SwiftCompilerSpec : CompilerSpec, SpecIdentifierType, SwiftDi
 
                 if cbc.scope.evaluate(BuiltinMacros.SWIFT_ENABLE_INCREMENTAL_COMPILATION) {
                     args.append("-incremental")
-                    if LibSwiftDriver.supportsDriverFlag(spelled: "-incremental-dependency-scan"),
-                       !cbc.scope.evaluate(BuiltinMacros.SWIFT_DISABLE_INCREMENTAL_SCAN) {
-                        args.append("-incremental-dependency-scan")
-                    }
                 }
             }
 
@@ -3291,8 +3285,6 @@ public final class SwiftCompilerSpec : CompilerSpec, SpecIdentifierType, SwiftDi
         for arg in [
             // Should strip this because it saves some work and avoids writing a useless incremental build record
             "-incremental",
-            // Same as above
-            "-incremental-dependency-scan",
 
             // Stripped because we want to end up in single file mode
             "-enable-batch-mode",

Tests/SWBBuildSystemTests/PreviewsBuildOperationTests.swift

@@ -831,7 +831,6 @@ fileprivate struct PreviewsBuildOperationTests: CoreBasedTests {
                             "ENABLE_PREVIEWS": "YES",
                             "CLANG_ENABLE_MODULES": "YES",
                             "SDK_STAT_CACHE_ENABLE": "NO",
-                            "SWIFT_DISABLE_INCREMENTAL_SCAN": "YES",
 
                             "SWIFT_ENABLE_EXPLICIT_MODULES": explicitModules ? "YES" : "NO",
 

Tests/SWBBuildSystemTests/SwiftDriverTests.swift

@@ -3616,7 +3616,6 @@ fileprivate struct SwiftDriverTests: CoreBasedTests {
                                             "ENABLE_PREVIEWS": "YES",
                                             "SWIFT_USE_INTEGRATED_DRIVER": useIntegratedDriver ? "YES" : "NO",
                                             "SWIFT_ENABLE_EXPLICIT_MODULES": useIntegratedDriver ? "YES" : "NO",
-                                            "SWIFT_DISABLE_INCREMENTAL_SCAN": "YES",
                                             "_EXPERIMENTAL_SWIFT_EXPLICIT_MODULES": useIntegratedDriver ? "YES" : "NO",
                                             // Eager linking is not supported when using the driver binary.
                                             "EAGER_LINKING": "NO",

Tests/SWBTaskConstructionTests/SwiftTaskConstructionTests.swift

@@ -646,7 +646,6 @@ fileprivate struct SwiftTaskConstructionTests: CoreBasedTests {
                                                 "SWIFT_PACKAGE_NAME": "FooPkg",
                                                 "SWIFT_EMIT_MODULE_INTERFACE": "YES",
                                                 "SWIFT_ENABLE_EXPLICIT_MODULES": "YES",
-                                                "SWIFT_DISABLE_INCREMENTAL_SCAN": "YES",
                                                ]),
                     ],
                     buildPhases: [
@@ -832,7 +831,6 @@ fileprivate struct SwiftTaskConstructionTests: CoreBasedTests {
                                                 "DEFINES_MODULE": "YES",
                                                 "SWIFT_VERSION": swiftVersion,
                                                 "SWIFT_EMIT_MODULE_INTERFACE": "YES",
-                                                "SWIFT_DISABLE_INCREMENTAL_SCAN": "YES",
                                                ]),
                     ],
                     buildPhases: [
@@ -1537,64 +1535,6 @@ fileprivate struct SwiftTaskConstructionTests: CoreBasedTests {
         }
     }
 
-    @Test(.requireSDKs(.macOS), .enabled(if: LibSwiftDriver.supportsDriverFlag(spelled: "-incremental-dependency-scan")))
-    func optOutIncrementalScanning() async throws {
-        let testProject = try await TestProject(
-            "aProject",
-            groupTree: TestGroup(
-                "SomeFiles", path: "Sources",
-                children: [
-                    TestFile("main.swift"),
-                ]),
-            buildConfigurations: [
-                TestBuildConfiguration(
-                    "Debug",
-                    buildSettings: [
-                        "PRODUCT_NAME": "$(TARGET_NAME)",
-                        "SWIFT_ENABLE_EXPLICIT_MODULES": "YES",
-                    ]),
-            ],
-            targets: [
-                TestStandardTarget(
-                    "Exec", type: .commandLineTool,
-                    buildConfigurations: [
-                        TestBuildConfiguration("Debug",
-                                               buildSettings: [
-                                                "SWIFT_EXEC": swiftCompilerPath.str,
-                                                "SWIFT_VERSION": swiftVersion,
-                                               ]),
-                    ],
-                    buildPhases: [
-                        TestSourcesBuildPhase([
-                            "main.swift",
-                        ]),
-                    ])
-            ])
-        let tester = try await TaskConstructionTester(getCore(), testProject)
-
-        await tester.checkBuild(runDestination: .macOS) { results in
-            results.checkTarget("Exec") { target in
-                results.checkTask(.matchTarget(target), .matchRuleType("SwiftDriver Compilation Requirements")) { task in
-                    task.checkCommandLineContains(["-explicit-module-build"])
-                    task.checkCommandLineContains(["-incremental"])
-                    task.checkCommandLineContains(["-incremental-dependency-scan"])
-                }
-            }
-            results.checkNoDiagnostics()
-        }
-
-        await tester.checkBuild(BuildParameters(configuration: "Debug", overrides: ["SWIFT_DISABLE_INCREMENTAL_SCAN": "YES"]), runDestination: .macOS) { results in
-            results.checkTarget("Exec") { target in
-                results.checkTask(.matchTarget(target), .matchRuleType("SwiftDriver Compilation Requirements")) { task in
-                    task.checkCommandLineContains(["-explicit-module-build"])
-                    task.checkCommandLineContains(["-incremental"])
-                    task.checkCommandLineDoesNotContain("-incremental-dependency-scan")
-                }
-            }
-            results.checkNoDiagnostics()
-        }
-    }
-
     @Test(.requireSDKs(.macOS))
     func swift4DisablesExplicitModules() async throws {
         let testProject = try await TestProject(