From 81e7811e01b22518cb5e533cf75ed5dda0873415 Mon Sep 17 00:00:00 2001
From: ringabout <43030857+ringabout@users.noreply.github.com>
Date: Sun, 2 Oct 2022 12:44:10 +0800
Subject: [PATCH] fixes nim check with orc (#20456)

* fixes nim check with orc

* fixes tests

* add tests

* fixes tests

* Update tests/arc/t20456.nim
---
 compiler/nim.nim            |  4 ++++
 tests/arc/t20456.nim        |  7 +++++++
 tests/errmsgs/tsigmatch.nim |  2 +-
 tests/misc/m20456.nims      |  1 +
 tests/misc/t20456_2.nim     | 14 ++++++++++++++
 5 files changed, 27 insertions(+), 1 deletion(-)
 create mode 100644 tests/arc/t20456.nim
 create mode 100644 tests/misc/m20456.nims
 create mode 100644 tests/misc/t20456_2.nim

diff --git a/compiler/nim.nim b/compiler/nim.nim
index 2a6b3bc1b7..b98a514d73 100644
--- a/compiler/nim.nim
+++ b/compiler/nim.nim
@@ -97,6 +97,10 @@ proc handleCmdLine(cache: IdentCache; conf: ConfigRef) =
   if not self.loadConfigsAndProcessCmdLine(cache, conf, graph):
     return
 
+  if conf.cmd == cmdCheck and optWasNimscript notin conf.globalOptions and
+       conf.backend == backendInvalid:
+    conf.backend = backendC
+
   if conf.selectedGC == gcUnselected:
     if conf.backend in {backendC, backendCpp, backendObjc}:
       initOrcDefines(conf)
diff --git a/tests/arc/t20456.nim b/tests/arc/t20456.nim
new file mode 100644
index 0000000000..ace79255a0
--- /dev/null
+++ b/tests/arc/t20456.nim
@@ -0,0 +1,7 @@
+discard """
+  cmd: "nim check $file"
+  action: "compile"
+"""
+
+when not defined(gcOrc):
+  {.error: "orc".}
diff --git a/tests/errmsgs/tsigmatch.nim b/tests/errmsgs/tsigmatch.nim
index 8f32ef9e66..49b3559829 100644
--- a/tests/errmsgs/tsigmatch.nim
+++ b/tests/errmsgs/tsigmatch.nim
@@ -1,5 +1,5 @@
 discard """
-  cmd: "nim check --showAllMismatches:on --hints:off $file"
+  cmd: "nim check --mm:refc --showAllMismatches:on --hints:off $file"
   nimout: '''
 tsigmatch.nim(111, 4) Error: type mismatch: got <A, string>
 but expected one of:
diff --git a/tests/misc/m20456.nims b/tests/misc/m20456.nims
new file mode 100644
index 0000000000..8a93131295
--- /dev/null
+++ b/tests/misc/m20456.nims
@@ -0,0 +1 @@
+echo 123
\ No newline at end of file
diff --git a/tests/misc/t20456_2.nim b/tests/misc/t20456_2.nim
new file mode 100644
index 0000000000..37e52c4522
--- /dev/null
+++ b/tests/misc/t20456_2.nim
@@ -0,0 +1,14 @@
+discard """
+  joinable: false
+"""
+
+import std/[osproc, os, strformat]
+from stdtest/specialpaths import testsDir
+
+when defined(nimPreviewSlimSystem):
+  import std/assertions
+
+const
+  nim = getCurrentCompilerExe()
+  file = testsDir / "misc" / "m20456.nims"
+doAssert execCmd(fmt"{nim} check {file}") == 0