[ScanDependency] Track link libraries specified by -public-autolink-library option

`explicit-auto-linking` mode should track library dependencies specified
by `-public-autolink-library` option too.

Author: kateinoigakukun

lib/Serialization/ScanningLoaders.cpp

@@ -149,11 +149,17 @@ SwiftModuleScanner::scanInterfaceFile(Twine moduleInterfacePath,
   llvm::SmallString<32> modulePath = realModuleName.str();
   llvm::sys::path::replace_extension(modulePath, newExt);
   std::optional<ModuleDependencyInfo> Result;
-  std::error_code code = astDelegate.runInSubContext(
+  std::error_code code = astDelegate.runInSubCompilerInstance(
       realModuleName.str(), moduleInterfacePath.str(), sdkPath,
-      StringRef(), SourceLoc(),
-      [&](ASTContext &Ctx, ModuleDecl *mainMod, ArrayRef<StringRef> BaseArgs,
-          ArrayRef<StringRef> PCMArgs, StringRef Hash) {
+      StringRef(), SourceLoc(), /*silenceErrors=*/false,
+      [&](SubCompilerInstanceInfo &info) {
+        ASTContext &Ctx = info.Instance->getASTContext();
+        ModuleDecl *mainMod = info.Instance->getMainModule();
+        ArrayRef<StringRef> BaseArgs = info.BuildArguments;
+        ArrayRef<StringRef> PCMArgs = info.ExtraPCMArgs;
+        StringRef Hash = info.Hash;
+        const CompilerInvocation &Invocation = info.Instance->getInvocation();
+
         assert(mainMod);
         std::string InPath = moduleInterfacePath.str();
         auto compiledCandidates =
@@ -241,6 +247,12 @@ SwiftModuleScanner::scanInterfaceFile(Twine moduleInterfacePath,
                                    isFramework ? LibraryKind::Framework : LibraryKind::Library,
                                    true});
         }
+
+        // Register libraries specified by `-public-autolink-library`
+        for (auto publicLinkLibrary : Invocation.getIRGenOptions().PublicLinkLibraries) {
+          linkLibraries.push_back(LinkLibrary(publicLinkLibrary, LibraryKind::Library));
+        }
+
         bool isStatic = llvm::find(ArgsRefs, "-static") != ArgsRefs.end();
 
         Result = ModuleDependencyInfo::forSwiftInterfaceModule(

test/ScanDependencies/Inputs/Swift/HasLinkDependency.swiftinterface

@@ -0,0 +1,3 @@
+// swift-interface-format-version: 1.0
+// swift-module-flags: -module-name HasLinkDependency -public-autolink-library linkDep
+import Swift

test/ScanDependencies/module_deps_link_libs.swift

@@ -9,6 +9,7 @@ import C
 import E
 import G
 import SubE
+import HasLinkDependency
 
 // CHECK: "mainModuleName": "deps"
 
@@ -33,6 +34,10 @@ import SubE
 // CHECK-NEXT:          "isFramework": false,
 // CHECK-NEXT:          "shouldForceLoad": true
 
+// CHECK-DAG:           "linkName": "linkDep",
+// CHECK-NEXT:          "isFramework": false,
+// CHECK-NEXT:          "shouldForceLoad": false
+
 // CHECK-DAG:           "linkName": "nonSwiftyLibC",
 // CHECK-NEXT:          "isFramework": true,
 // CHECK-NEXT:          "shouldForceLoad": false