From 6d819ab178df3aa570190b397c7d65a912700fae Mon Sep 17 00:00:00 2001
From: Amaury Pouly <amaury.pouly@lowrisc.org>
Date: Fri, 15 Nov 2024 13:48:33 +0000
Subject: [PATCH] fixup! [rules] Create an empty file for missing IPS in
 opentitan_ip_c_header

---
 rules/autogen.bzl | 38 ++++++++++++++++++++------------------
 1 file changed, 20 insertions(+), 18 deletions(-)

diff --git a/rules/autogen.bzl b/rules/autogen.bzl
index fdd5fff481f151..3bfd4c17cae0f1 100644
--- a/rules/autogen.bzl
+++ b/rules/autogen.bzl
@@ -65,26 +65,28 @@ def _opentitan_ip_rust_header_impl(ctx):
     tock = ctx.actions.declare_file("{}.rs".format(ctx.attr.ip))
     top = ctx.attr.top[OpenTitanTopInfo]
     if ctx.attr.ip not in top.ip_hjson:
-        fail("Cannot generate headers: top {} does not contain IP {}".format(top.name, ctx.attr.ip))
-    hjson = top.ip_hjson[ctx.attr.ip]
+        # If this IP is not in the top, simply generate an an empty file.
+        ctx.actions.write(tock, "")
+    else:
+        hjson = top.ip_hjson[ctx.attr.ip]
 
-    stamp_args = []
-    stamp_files = []
-    if stamping_enabled(ctx):
-        stamp_files = [ctx.version_file]
-        stamp_args.append("--version-stamp={}".format(ctx.version_file.path))
+        stamp_args = []
+        stamp_files = []
+        if stamping_enabled(ctx):
+            stamp_files = [ctx.version_file]
+            stamp_args.append("--version-stamp={}".format(ctx.version_file.path))
 
-    ctx.actions.run(
-        outputs = [tock],
-        inputs = [hjson] + stamp_files,
-        arguments = [
-            "--tock",
-            "-q",
-            "-o",
-            tock.path,
-        ] + stamp_args + [hjson.path],
-        executable = ctx.executable._regtool,
-    )
+        ctx.actions.run(
+            outputs = [tock],
+            inputs = [hjson] + stamp_files,
+            arguments = [
+                "--tock",
+                "-q",
+                "-o",
+                tock.path,
+            ] + stamp_args + [hjson.path],
+            executable = ctx.executable._regtool,
+        )
 
     return [
         DefaultInfo(files = depset([tock])),