synth-stubs-flow.patch

private/flow.bzl: substitute macros->_synth for synth deps in _orfs_pass

--- a/private/flow.bzl
+++ b/private/flow.bzl
@@ -38,6 +38,29 @@
     kwargs.pop("yosys", None)
     return kwargs
 
+_GENERATE_ABSTRACT_SUFFIX = "_generate_abstract"
+
+def _synth_macros(macros):
+    """Substitute each `<name>_generate_abstract` macro label with its
+    `<name>_synth` sibling so the parent's synth Bazel action depends
+    only on each child macro's synth target, not the macro's full
+    PD flow.
+
+    The substituted target's OrfsInfo carries a port-only stub LEF
+    (1_synth.lef) and stub Liberty (1_synth.lib) emitted by
+    synth_odb.tcl under ORFS_WRITE_SYNTH_STUBS=1. Labels that
+    don't follow the `_generate_abstract` convention are passed
+    through unchanged (e.g. behavioral macros without a synth flow).
+    """
+    out = []
+    for m in macros:
+        s = str(m)
+        if s.endswith(_GENERATE_ABSTRACT_SUFFIX):
+            out.append(s[:-len(_GENERATE_ABSTRACT_SUFFIX)] + "_synth")
+        else:
+            out.append(m)
+    return out
+
 def _merge_extra_arguments(a, b):
     """Merge two {stage: [label, ...]} dicts, concatenating per-stage lists."""
     merged = dict(a)
@@ -518,7 +541,7 @@
                 stage_arguments = stage_arguments,
                 arguments = arguments,
                 sources = sources,
-                deps = macros,
+                deps = _synth_macros(macros),
                 kept_macros = kept_macros if kept_macros != None else {},
                 kept_macros_enabled = kept_macros != None,
                 module_top = top,