From e97380913c6bb77d3e47d086445fea0987649d11 Mon Sep 17 00:00:00 2001
From: Martin Kojtal <0xc0170@gmail.com>
Date: Wed, 12 Jul 2017 12:59:00 +0100
Subject: [PATCH] tools: fix toolchain extend inc paths

inc paths might be a list or might not be (just single string). If they don't, we are ending up with non valid include paths (one letter include paths).
This as result would not compile.
---
 tools/toolchains/__init__.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/tools/toolchains/__init__.py b/tools/toolchains/__init__.py
index 4d5562f68f..8741bc80b1 100644
--- a/tools/toolchains/__init__.py
+++ b/tools/toolchains/__init__.py
@@ -863,7 +863,10 @@ class mbedToolchain:
 
         inc_paths = resources.inc_dirs
         if inc_dirs is not None:
-            inc_paths.extend(inc_dirs)
+            if isinstance(inc_dirs, list):
+                inc_paths.extend(inc_dirs)
+            else:
+                inc_paths.append(inc_dirs)
         # De-duplicate include paths
         inc_paths = set(inc_paths)
         # Sort include paths for consistency