Fix copy shared libraries when target label contains subdirectories

Fixes bazelbuild#12448

Closes bazelbuild#12449.

PiperOrigin-RevId: 343109568

src/main/java/com/google/devtools/build/lib/rules/cpp/CcBinary.java

@@ -1049,23 +1049,26 @@ private static Packager createIntermediateDwpPackagers(
   private static NestedSet<Artifact> createDynamicLibrariesCopyActions(
       RuleContext ruleContext, Iterable<Artifact> dynamicLibrariesForRuntime) {
     NestedSetBuilder<Artifact> result = NestedSetBuilder.stableOrder();
-    for (Artifact target : dynamicLibrariesForRuntime) {
+    for (Artifact lib : dynamicLibrariesForRuntime) {
       // If the binary and the DLL don't belong to the same package or the DLL is a source file,
       // we should copy the DLL to the binary's directory.
       if (!ruleContext
               .getLabel()
               .getPackageIdentifier()
-              .equals(target.getOwner().getPackageIdentifier())
-          || target.isSourceArtifact()) {
+              .equals(lib.getOwner().getPackageIdentifier())
+          || lib.isSourceArtifact()) {
+        String targetName = ruleContext.getTarget().getName();
+        PathFragment targetSubDir = PathFragment.create(targetName).getParentDirectory();
         // SymlinkAction on file is actually copy on Windows.
-        Artifact copy = ruleContext.getBinArtifact(target.getFilename());
-        ruleContext.registerAction(SymlinkAction.toArtifact(
-            ruleContext.getActionOwner(), target, copy, "Copying Execution Dynamic Library"));
+        Artifact copy = ruleContext.getBinArtifact(targetSubDir.getRelative(lib.getFilename()));
+        ruleContext.registerAction(
+            SymlinkAction.toArtifact(
+                ruleContext.getActionOwner(), lib, copy, "Copying Execution Dynamic Library"));
         result.add(copy);
       } else {
-        // If the target is already in the same directory as the binary, we don't need to copy it,
+        // If the library is already in the same directory as the binary, we don't need to copy it,
         // but we still add it the result.
-        result.add(target);
+        result.add(lib);
       }
     }
     return result.build();

src/test/py/bazel/bazel_windows_cpp_test.py

@@ -683,11 +683,25 @@ def testCopyDLLAsSource(self):
         'cc_import(',
         '  name = "a_import",',
         '  shared_library = "A.dll",',
+        '  visibility = ["//:__subpackages__"],',
+        ')',
+        ''
+        'filegroup(',
+        '  name = "bin_src",',
+        '  srcs = ["bin.cc"],',
+        '  visibility = ["//:__subpackages__"],',
         ')',
         '',
         'cc_binary(',
         '  name = "bin",',
-        '  srcs = ["bin.cc"],',
+        '  srcs = ["//:bin_src"],',
+        '  deps = ["//:a_import"],',
+        ')',
+    ])
+    self.ScratchFile('package/BUILD', [
+        'cc_binary(',
+        '  name = "dir1/dir2/bin",',
+        '  srcs = ["//:bin_src"],',
         '  deps = ["//:a_import"],',
         ')',
     ])
@@ -700,15 +714,19 @@ def testCopyDLLAsSource(self):
     exit_code, _, stderr = self.RunBazel([
         'build',
         '//:bin',
+        '//package:dir1/dir2/bin',
     ])
     self.AssertExitCode(exit_code, 0, stderr)
 
     bazel_bin = self.getBazelInfo('bazel-bin')
-    a_dll = os.path.join(bazel_bin, 'A.dll')
-    # Even though A.dll is in the same package as bin.exe, but it still should
+    # Even though A.dll is in the same package as bin.exe, it still should
     # be copied to the output directory of bin.exe.
+    a_dll = os.path.join(bazel_bin, 'A.dll')
     self.assertTrue(os.path.exists(a_dll))
 
+    nested_a_dll = os.path.join(bazel_bin, 'package/dir1/dir2/A.dll')
+    self.assertTrue(os.path.exists(nested_a_dll))
+
   def testCppErrorShouldBeVisible(self):
     self.CreateWorkspaceWithDefaultRepos('WORKSPACE')
     self.ScratchFile('BUILD', [