From 91ce4515c87c084ade6b2b74ebfc2e19e25b5261 Mon Sep 17 00:00:00 2001
From: cooldome <ariabushenko@gmail.com>
Date: Fri, 9 Oct 2020 07:52:26 +0100
Subject: [PATCH] fix gc:arc in nimscript (#15525)

---
 compiler/scriptconfig.nim | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/compiler/scriptconfig.nim b/compiler/scriptconfig.nim
index 13ab03426a..b359c9a482 100644
--- a/compiler/scriptconfig.nim
+++ b/compiler/scriptconfig.nim
@@ -228,11 +228,14 @@ proc runNimScript*(cache: IdentCache; scriptName: AbsoluteFile;
 
   # watch out, "newruntime" can be set within NimScript itself and then we need
   # to remember this:
+  if conf.selectedGC == gcUnselected:
+    conf.selectedGC = oldSelectedGC
   if optOwnedRefs in oldGlobalOptions:
     conf.globalOptions.incl {optTinyRtti, optOwnedRefs, optSeqDestructors}
     defineSymbol(conf.symbols, "nimv2")
-  if conf.selectedGC == gcUnselected:
-    conf.selectedGC = oldSelectedGC
+  if conf.selectedGC in {gcArc, gcOrc}:
+    conf.globalOptions.incl {optTinyRtti, optSeqDestructors}
+    defineSymbol(conf.symbols, "nimv2")
 
   # ensure we load 'system.nim' again for the real non-config stuff!
   resetSystemArtifacts(graph)