From fda43d1f0a2f4867bae0330c2f20d784200602b9 Mon Sep 17 00:00:00 2001
From: ringabout <43030857+ringabout@users.noreply.github.com>
Date: Thu, 27 Jun 2024 00:24:51 +0800
Subject: [PATCH] fixes #9940; genericAssign does not take care of the importC
 variables in refc [backport] (#23761)

fixes #9940

(cherry picked from commit 828cd58d8a0376a5b7a6ad58d73d66617b37629a)
---
 compiler/ccgtypes.nim    |  2 +-
 tests/ccgbugs/tcgbug.nim | 28 ++++++++++++++++++++++++++++
 2 files changed, 29 insertions(+), 1 deletion(-)

diff --git a/compiler/ccgtypes.nim b/compiler/ccgtypes.nim
index 7fdd0a9b3d..935b33ab2e 100644
--- a/compiler/ccgtypes.nim
+++ b/compiler/ccgtypes.nim
@@ -1246,7 +1246,7 @@ proc genObjectInfo(m: BModule, typ, origType: PType, name: Rope; info: TLineInfo
   else:
     genTypeInfoAuxBase(m, typ, origType, name, rope("0"), info)
   var tmp = getNimNode(m)
-  if not isImportedType(typ):
+  if (not isImportedType(typ)) or tfCompleteStruct in typ.flags:
     genObjectFields(m, typ, origType, typ.n, tmp, info)
   m.s[cfsTypeInit3].addf("$1.node = &$2;$n", [tiNameForHcr(m, name), tmp])
   var t = typ[0]
diff --git a/tests/ccgbugs/tcgbug.nim b/tests/ccgbugs/tcgbug.nim
index 75b8c34d45..871008094d 100644
--- a/tests/ccgbugs/tcgbug.nim
+++ b/tests/ccgbugs/tcgbug.nim
@@ -4,6 +4,7 @@ success
 M1 M2
 ok
 '''
+matrix: "--mm:refc;--mm:orc"
 """
 
 type
@@ -132,3 +133,30 @@ proc foo = # bug #23280
   doAssert L mod 6 == 0 
 
 foo()
+
+block: # bug #9940
+  {.emit:"""/*TYPESECTION*/
+typedef struct { int base; } S;
+""".}
+
+  type S {.importc: "S", completeStruct.} = object
+    base: cint
+  proc init(x:ptr S) =
+    x.base = 1
+
+  type
+    Foo = object
+      a: seq[float]
+      b: seq[float]
+      c: seq[float]
+      d: seq[float]
+      s: S
+
+  proc newT(): Foo =
+    var t: Foo
+    t.s.addr.init
+    doAssert t.s.base == 1
+    t
+
+  var t = newT()
+  doAssert t.s.base == 1