Merge pull request hdl#311 from hdl/multi_lib

Extract extra lib files if they exist

Author: QuantamHD

pdk/proto/build_defs.bzl

@@ -24,6 +24,10 @@ def _extract_lef_and_liberty_impl(ctx):
 
         content.append("liberty_path: \"{}\"".format(standard_cell.default_corner.liberty.short_path))
         out_files.append(standard_cell.default_corner.liberty)
+
+        for file in [corner.liberty for corner in standard_cell.corners]:
+            content.append("additional_liberty_paths: \"{}\"".format(file.short_path))
+            out_files.append(file)
     else:
         for file in ctx.attr.cell_lef_paths:
             content.append("cell_lef_paths: \"{}\"".format(file))

pdk/proto/pdk_info.proto

@@ -6,6 +6,7 @@ message PdkInfoProto {
   repeated string cell_lef_paths = 1;
   optional string tech_lef_path = 2;
   optional string liberty_path = 3;
+  optional string additional_liberty_paths = 28;
   optional string tracks_file_path = 4;
   optional string pin_horizontal_metal_layer = 5;
   optional string pin_vertical_metal_layer = 6;