soc/integration: return vns with soc and builder

litex/soc/integration/builder.py

@@ -154,9 +154,10 @@ class Builder:
 
         if self.gateware_toolchain_path is not None:
             toolchain_path = self.gateware_toolchain_path
-        self.soc.build(build_dir=os.path.join(self.output_dir, "gateware"),
+        vns = self.soc.build(build_dir=os.path.join(self.output_dir, "gateware"),
                              run=self.compile_gateware, toolchain_path=toolchain_path,
                              **kwargs)
+        return vns
 
 
 def builder_args(parser):

litex/soc/integration/soc_core.py

@@ -201,7 +201,7 @@ class SoCCore(Module):
                     self.comb += self.cpu_or_bridge.interrupt[v].eq(getattr(self, k).ev.irq)
 
     def build(self, *args, **kwargs):
-        self.platform.build(self, *args, **kwargs)
+        return self.platform.build(self, *args, **kwargs)
 
 
 def soc_core_args(parser):