Index: lld/COFF/Driver.cpp
===================================================================
--- lld/COFF/Driver.cpp
+++ lld/COFF/Driver.cpp
@@ -408,6 +408,10 @@
     case OPT_section:
       parseSection(arg->getValue());
       break;
+    case OPT_stack:
+      parseNumbers(arg->getValue(), &config->stackReserve,
+                   &config->stackCommit);
+      break;
     case OPT_subsystem: {
       bool gotVersion = false;
       parseSubsystem(arg->getValue(), &config->subsystem,