Hotfix: bazel sync fails when skipping platforms (#1)

* hotfix: bazel sync fails when skipping platforms

* change stub from filegroup to cc_library

Author: Lmh-java

BUILD

@@ -3,4 +3,5 @@ package(default_visibility = ["//visibility:public"])
 exports_files([
     "pkg_config.bzl",
     "BUILD.tmpl",
+    "BUILD.empty.tmpl",
 ])

BUILD.empty.tmpl

@@ -0,0 +1,15 @@
+# vi: ft=bzl
+# Skipped on platform %{platform} by rule configuration
+
+cc_library(
+    name = "lib",
+    srcs = [],
+    hdrs = [],
+    visibility = ["//visibility:public"],
+)
+
+cc_library(
+    name = "internal_lib",
+    srcs = [],
+    visibility = ["//visibility:public"],
+)

pkg_config.bzl

@@ -137,7 +137,9 @@ def _pkg_config_impl(ctx):
     os_name = _get_current_platform(ctx)
     pkg_name = ctx.attr.pkg_name
     if os_name in ctx.attr.skip_platforms:
-        ctx.file("BUILD", "# Skipped on platform {} by rule configuration".format(os_name))
+        ctx.template("BUILD", Label("//:BUILD.empty.tmpl"), substitutions = {
+            "%{platform}": os_name,
+        }, executable = False)
         # If we should not build on current platform, then the procedure finishes here.
         # We would consider this as successful.
         message_string = "Local lib '{}' skipped on platform {} by rule configuration".format(pkg_name, os_name)