Attempt to fix Windows issue

MODULE.bazel

@@ -5,12 +5,12 @@ module(
 )
 
 bazel_dep(name = "bazel_skylib", version = "1.4.1")
+bazel_dep(name = "platforms", version = "0.0.6")
 
 bazel_dep(name = "aspect_bazel_lib", version = "1.34.0", dev_dependency = True)
 bazel_dep(name = "bazel_skylib_gazelle_plugin", version = "1.4.1", dev_dependency = True)
 bazel_dep(name = "buildifier_prebuilt", version = "6.4.0", dev_dependency = True)
 bazel_dep(name = "gazelle", version = "0.33.0", dev_dependency = True, repo_name = "bazel_gazelle")
-bazel_dep(name = "platforms", version = "0.0.6", dev_dependency = True)
 bazel_dep(name = "rules_testing", version = "0.4.0", dev_dependency = True)
 bazel_dep(name = "stardoc", dev_dependency = True)
 git_override(

with_cfg/private/frontend.bzl

@@ -11,18 +11,30 @@ def get_frontend(*, executable, test):
         return _frontend_default
 
 def _frontend_impl(ctx):
+    # type: (ctx) -> None
     target = ctx.attr.exports
 
     original_executable = target[FrontendInfo].executable
-    dirname, separator, basename = ctx.label.name.rpartition("/")
     executable_basename = original_executable.basename
-    executable = ctx.actions.declare_file(dirname + separator + basename + "/" + executable_basename)
+    executable = ctx.actions.declare_file(ctx.label.name + "/" + executable_basename)
+
+    additional_runfiles = [executable]
+    if CcInfo in target and ctx.target_platform_has_constraint(ctx.attr._windows[platform_common.ConstraintValueInfo]):
+        dlls_to_relocate = [
+            f
+            for f in target[DefaultInfo].default_runfiles.files.to_list()
+            if f.path.endswith(".dll") and f.dirname != executable.dirname
+        ]
+        for dll in dlls_to_relocate:
+            out_dll = ctx.actions.declare_file(dll.basename, sibling = executable)
+            ctx.actions.symlink(output = out_dll, target_file = dll)
+            additional_runfiles.append(out_dll)
+
+    print(additional_runfiles)
 
-    # TODO: If this is a copy rather than a symlink, runfiles discovery will not work correctly.
-    #       Fix this by using a wrapper script rather than a symlink.
     ctx.actions.symlink(output = executable, target_file = original_executable)
-    data_runfiles = ctx.runfiles([executable]).merge(target[DefaultInfo].data_runfiles)
-    default_runfiles = ctx.runfiles([executable]).merge(target[DefaultInfo].default_runfiles)
+    data_runfiles = ctx.runfiles(additional_runfiles).merge(target[DefaultInfo].data_runfiles)
+    default_runfiles = ctx.runfiles(additional_runfiles).merge(target[DefaultInfo].default_runfiles)
 
     run_environment_info = _clean_run_environment_info(
         target[FrontendInfo].run_environment_info,
@@ -79,6 +91,7 @@ _frontend_attrs = {
         mandatory = True,
         providers = [FrontendInfo],
     ),
+    "_windows": attr.label(default = "@platforms//os:windows"),
 }
 
 _frontend_test_attrs = {