clang/win: Support spaces in Visual Studio directory name

build/toolchain/win/setup_toolchain.py

Index: build/toolchain/win/setup_toolchain.py
diff --git a/build/toolchain/win/setup_toolchain.py b/build/toolchain/win/setup_toolchain.py
index d58cb8536335647195f2945001993ade05fbd9de..0d0975dfe3a6444719fea252becfd87b37448069 100644
--- a/build/toolchain/win/setup_toolchain.py
+++ b/build/toolchain/win/setup_toolchain.py
@@ -17,6 +17,9 @@ import re
 import subprocess
 import sys
 
+sys.path.append(os.path.join(os.path.dirname(__file__), os.pardir, os.pardir))
+import gn_helpers
+
 SCRIPT_DIR = os.path.dirname(__file__)
 
 def _ExtractImportantEnvironment(output_of_set):
@@ -204,8 +207,8 @@ def main():
           break
       # The separator for INCLUDE here must match the one used in
       # _LoadToolchainEnv() above.
-      include = ' '.join([include_prefix + p
-                          for p in env['INCLUDE'].split(';')])
+      include = [include_prefix + p for p in env['INCLUDE'].split(';') if p]
+      include = ' '.join(['"' + i.replace('"', r'\"') + '"' for i in include])
 
     env_block = _FormatAsEnvironmentBlock(env)
     with open('environment.' + cpu, 'wb') as f:
@@ -221,11 +224,9 @@ def main():
       f.write(env_block)
 
   assert vc_bin_dir
-  assert '"' not in vc_bin_dir
-  print 'vc_bin_dir = "%s"' % vc_bin_dir
+  print 'vc_bin_dir = ' + gn_helpers.ToGNString(vc_bin_dir)
   assert include
-  assert '"' not in include
-  print 'include_flags = "%s"' % include
+  print 'include_flags = ' + gn_helpers.ToGNString(include)
 
 if __name__ == '__main__':
   main()