fix: disable stardoc under bzlmod and windows by default

We've been making these exceptions in downstream repos

lib/BUILD.bazel

@@ -1,4 +1,5 @@
 load("@bazel_skylib//:bzl_library.bzl", "bzl_library")
+load("@bazel_skylib//rules:common_settings.bzl", "bool_flag")
 load("//lib/private:stamping.bzl", "stamp_build_setting")
 
 # Ensure that users building their own rules can dep on our bzl_library targets for their stardoc
@@ -15,6 +16,23 @@ exports_files(
 # Macro that creates targets enabling the use of `--stamp` in Starlark rules
 stamp_build_setting(name = "stamp")
 
+# Add a flag indicating that bzlmod is enabled so that we can use select()
+# to skip bzlmod-incompatible targets. Note that Bazel does not currently
+# support declaring a config_setting directly on --enable_bzlmod, so we
+# must use set this flag instead.
+
+config_setting(
+    name = "bzlmod",
+    flag_values = {
+        ":flag_bzlmod": "true",
+    },
+)
+
+bool_flag(
+    name = "flag_bzlmod",
+    build_setting_default = False,
+)
+
 toolchain_type(
     name = "jq_toolchain_type",
 )

lib/private/docs.bzl

@@ -17,13 +17,24 @@ def stardoc_with_diff_test(
         **kwargs: additional attributes passed to the stardoc() rule, such as for overriding the templates
     """
 
+    target_compatible_with = kwargs.pop("target_compatible_with", select({
+        # stardoc doesn't work under bzlmod:
+        # https://github.com/bazelbuild/bazel/issues/14140
+        "@aspect_bazel_lib//lib:bzlmod": ["@platforms//:incompatible"],
+        # stardoc produces different line endings on Windows
+        # which makes the diff_test fail
+        "@platforms//os:windows": ["@platforms//:incompatible"],
+        "//conditions:default": [],
+    }))
+
     # Generate MD from .bzl
     _stardoc(
         name = name,
         out = name + "-docgen.md",
         input = bzl_library_target + ".bzl",
         deps = [bzl_library_target],
         tags = ["package:" + native.package_name()],  # Tag the package name which will help us reconstruct the write_source_files label in update_docs
+        target_compatible_with = target_compatible_with,
         **kwargs
     )