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-rw-r--r--tools/building.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/tools/building.py b/tools/building.py
index d4f6b42129..624245c202 100644
--- a/tools/building.py
+++ b/tools/building.py
@@ -123,7 +123,7 @@ def PrepareBuilding(env, root_directory, has_libcpu=False, remove_components = [
global Rtt_Root
Env = env
- Rtt_Root = root_directory
+ Rtt_Root = os.path.abspath(root_directory)
# add compability with Keil MDK 4.6 which changes the directory of armcc.exe
if rtconfig.PLATFORM == 'armcc':