Vendor dependencies

Let's see how I like this workflow.

vendor/cxx/tools/bazel/rust_cxx_bridge.bzl

@@ -0,0 +1,49 @@
+# buildifier: disable=module-docstring
+load("@bazel_skylib//rules:run_binary.bzl", "run_binary")
+load("@rules_cc//cc:defs.bzl", "cc_library")
+
+def rust_cxx_bridge(name, src, deps = []):
+    """A macro defining a cxx bridge library
+
+    Args:
+        name (string): The name of the new target
+        src (string): The rust source file to generate a bridge for
+        deps (list, optional): A list of dependencies for the underlying cc_library. Defaults to [].
+    """
+    native.alias(
+        name = "%s/header" % name,
+        actual = src + ".h",
+    )
+
+    native.alias(
+        name = "%s/source" % name,
+        actual = src + ".cc",
+    )
+
+    run_binary(
+        name = "%s/generated" % name,
+        srcs = [src],
+        outs = [
+            src + ".h",
+            src + ".cc",
+        ],
+        args = [
+            "$(location %s)" % src,
+            "-o",
+            "$(location %s.h)" % src,
+            "-o",
+            "$(location %s.cc)" % src,
+        ],
+        tool = "@cxx.rs//:codegen",
+    )
+
+    cc_library(
+        name = name,
+        srcs = [src + ".cc"],
+        deps = deps + [":%s/include" % name],
+    )
+
+    cc_library(
+        name = "%s/include" % name,
+        hdrs = [src + ".h"],
+    )