Add support for "black-box" (ie no-implementation) entities

tools/hdl.bzl

@@ -207,6 +207,13 @@ vhdl_unit = rule(
             ),
             default=False,
         ),
+        "is_black_box": attrs.bool(
+            doc=(
+                "Set to true for code that will get dropped from synth and sim, but\
+                is used for LSP analysis (like generated IP shims)"
+            ),
+            default=False,
+        ),
         "codec_package": attrs.string(
             doc=(
                 "Set to True when you want to generate VUnit codec package\
@@ -252,4 +259,11 @@ def sim_only_model(**kwargs):
 # user doesn't have to do so
 def third_party(**kwargs):
     kwargs.update({"is_third_party": True})
+    vhdl_unit(**kwargs)
+
+# A helper macro for declaring empty entities in BUCK files
+# to keep the LSP happy (no missing entities) but these entities
+# are dropped from synthesis and simulation outputs
+def black_box(**kwargs):
+    kwargs.update({"is_black_box": True})
     vhdl_unit(**kwargs)

tools/multitool/multitool_cli.py

@@ -66,7 +66,6 @@ def vunit_files():
     try:
         import vunit
         vunit_install_dir = Path(vunit.__file__).parent
-        print(vunit_install_dir)
     except:
         print("Error attempting to import vunit module."
               " Check tools/requirements.txt and install deps as necessary"