Fix library link option generation on Linux.

third_party/cython/python_flags.py

Index: third_party/cython/python_flags.py
diff --git a/third_party/cython/python_flags.py b/third_party/cython/python_flags.py
index 03c4ad752dfc2adaa901877b088bdfcd0659db26..d7e0e3d2ee22998594a5664cf16508d4fdacf35d 100644
--- a/third_party/cython/python_flags.py
+++ b/third_party/cython/python_flags.py
@@ -34,9 +34,13 @@ def main():
   result = []
   if opts.libraries:
     libraries = b.get_libraries(ext)
-    if sys.platform == 'darwin':
-      libraries += [ '-lpython%s' % sys.version[:3] ]
-    result = result + libraries
+    if sys.platform in ['darwin', 'linux2']:
+      # In case of darwin and linux prefix all libraries (if there is any)
+      # so it can be used as a compiler argument.
+      libraries = set(['-l%s' % library for library in libraries])

[qsr, 2014/08/29 15:25:34]

Order of the libraries on a command line may matter. You cannot use a set here.

+      if sys.platform == 'darwin':
+        libraries.add('-lpython%s' % sys.version[:3])
+    result.extend(libraries)
   if opts.includes:
     result = result  + b.include_dirs
   if opts.library_dirs: