Swift: Add library search paths for dependencies

When building Swift executables and libraries which import a module, an
implicit link will be added by the driver.  Because this links by name
rather than path, the library search path needs to be provided to
indicate where to find the library.  For all local dependencies, add the
library paths for the targets when linking.  This ensures that you can
link against local libraries without explicitly setting a library path.

Fixes: #19304

Source/cmLinkLineComputer.cxx

@@ -99,14 +99,34 @@ std::string cmLinkLineComputer::ComputeLinkPath(
   std::string const& libPathTerminator)
 {
   std::string linkPath;
-  std::vector<std::string> const& libDirs = cli.GetDirectories();
-  for (std::string const& libDir : libDirs) {
-    std::string libpath = this->ConvertToOutputForExisting(libDir);
-    linkPath += " " + libPathFlag;
-    linkPath += libpath;
-    linkPath += libPathTerminator;
-    linkPath += " ";
+
+  if (cli.GetLinkLanguage() == "Swift") {
+    for (const cmComputeLinkInformation::Item& item : cli.GetItems()) {
+      const cmGeneratorTarget* target = item.Target;
+      if (!target) {
+        continue;
+      }
+
+      if (target->GetType() == cmStateEnums::STATIC_LIBRARY ||
+          target->GetType() == cmStateEnums::SHARED_LIBRARY) {
+        cmStateEnums::ArtifactType type = cmStateEnums::RuntimeBinaryArtifact;
+        if (target->GetType() == cmStateEnums::SHARED_LIBRARY &&
+            target->IsDLLPlatform()) {
+          type = cmStateEnums::ImportLibraryArtifact;
+        }
+
+        linkPath += " " + libPathFlag +
+          item.Target->GetDirectory(cli.GetConfig(), type) +
+          libPathTerminator + " ";
+      }
+    }
   }
+
+  for (std::string const& libDir : cli.GetDirectories()) {
+    linkPath += " " + libPathFlag + this->ConvertToOutputForExisting(libDir) +
+      libPathTerminator + " ";
+  }
+
   return linkPath;
 }