From 334032294ffd9549a772312cfe5e776c0b9aa934 Mon Sep 17 00:00:00 2001
From: LemonBoy <thatlemon@gmail.com>
Date: Wed, 19 Sep 2018 12:46:50 +0200
Subject: [PATCH] Fix linking issue in cpp codegen

Declare the root symbol only once and have the other modules depending
on it emit an `extern` declaration.

Fixes #9013
---
 lib/system/hti.nim  | 6 +++++-
 tests/cpp/t9013.nim | 9 +++++++++
 2 files changed, 14 insertions(+), 1 deletion(-)
 create mode 100644 tests/cpp/t9013.nim

diff --git a/lib/system/hti.nim b/lib/system/hti.nim
index c7b52bbdfc..bffe81bc85 100644
--- a/lib/system/hti.nim
+++ b/lib/system/hti.nim
@@ -103,6 +103,10 @@ type
   PNimType = ptr TNimType
 
 when defined(nimTypeNames):
-  var nimTypeRoot {.compilerProc.}: PNimType
+  # Declare this variable only once in system.nim
+  when declared(ThisIsSystem):
+    var nimTypeRoot {.compilerProc.}: PNimType
+  else:
+    var nimTypeRoot {.importc.}: PNimType
 
 # node.len may be the ``first`` element of a set
diff --git a/tests/cpp/t9013.nim b/tests/cpp/t9013.nim
new file mode 100644
index 0000000000..6103cf2e74
--- /dev/null
+++ b/tests/cpp/t9013.nim
@@ -0,0 +1,9 @@
+discard """
+  targets: "cpp"
+  cmd: "nim $target --debugger:native $options $file"
+"""
+
+# The --debugger switch is needed in order to enable the defined(nimTypeNames)
+# code path in hti.nim
+import typeinfo
+var tt: Any