From 2536db1b6a54f84035933a14e08e3487931101a9 Mon Sep 17 00:00:00 2001
From: zah <zahary@status.im>
Date: Fri, 21 Oct 2022 22:48:43 +0300
Subject: [PATCH] Work-around a Nim 1.6 issue in the handling of the NBS paths
 file (#4253)

---
 config.nims | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/config.nims b/config.nims
index 2b51b5c77..dea1e2127 100644
--- a/config.nims
+++ b/config.nims
@@ -2,8 +2,14 @@ import strutils
 
 --noNimblePath
 
+const currentDir = currentSourcePath()[0 .. ^(len("config.nims") + 1)]
+
 if getEnv("NIMBUS_BUILD_SYSTEM") == "yes" and
-   system.fileExists("nimbus-build-system.paths"):
+   # BEWARE
+   # In Nim 1.6, config files are evaluated with a working directory
+   # matching where the Nim command was invocated. This means that we
+   # must do all file existance checks with full absolute paths:
+   system.fileExists(currentDir & "nimbus-build-system.paths"):
   include "nimbus-build-system.paths"
 
 const nimCachePathOverride {.strdefine.} = ""
@@ -130,7 +136,6 @@ switch("passL", "-fno-omit-frame-pointer")
 # for heap-usage-by-instance-type metrics and object base-type strings
 --define:nimTypeNames
 
-const currentDir = currentSourcePath()[0 .. ^(len("config.nims") + 1)]
 switch("define", "nim_compiler_path=" & currentDir & "env.sh nim")
 switch("define", "withoutPCRE")