Strip trailing backslashes from vcvarsall results

build/vs_toolchain.py

Index: build/vs_toolchain.py
diff --git a/build/vs_toolchain.py b/build/vs_toolchain.py
index 2977159b02f18a5fbc1216dccbd3e19ff26afdcf..4d0380e38d4fef6eb98aa0f6d1d65154a9ff532b 100755
--- a/build/vs_toolchain.py
+++ b/build/vs_toolchain.py
@@ -331,6 +331,12 @@ def Update(force=False):
   return 0
 
 
+def NormalizePath(path):
+  while path.endswith("\\"):
+    path = path[:-1]
+  return path
+
+
 def GetToolchainDir():
   """Gets location information about the current toolchain (must have been
   previously updated by 'update'). This is used for the GN build."""
@@ -348,10 +354,10 @@ vs_version = "%s"
 wdk_dir = "%s"
 runtime_dirs = "%s"
 ''' % (
-      os.environ['GYP_MSVS_OVERRIDE_PATH'],
-      os.environ['WINDOWSSDKDIR'],
+      NormalizePath(os.environ['GYP_MSVS_OVERRIDE_PATH']),
+      NormalizePath(os.environ['WINDOWSSDKDIR']),
       GetVisualStudioVersion(),
-      os.environ.get('WDK_DIR', ''),
+      NormalizePath(os.environ.get('WDK_DIR', '')),
       os.path.pathsep.join(runtime_dll_dirs or ['None']))