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..55acc1c43e1a93a6dd4e92f146aad48fb2e1b2fb 100644
--- a/third_party/cython/python_flags.py
+++ b/third_party/cython/python_flags.py
@@ -34,9 +34,14 @@ 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. There are cases when we
+      # don't get anything on these systems, so just to be save add a
+      # default python lib.
+      libraries = set(['-l%s' % library for library in libraries])
+      libraries.add('-lpython%s' % sys.version[:3])

[qsr, 2014/08/29 15:11:52]

This last line should only happen on mac. On linux, I never needed to add the
python library myself.

+    result.extend(libraries)
   if opts.includes:
     result = result  + b.include_dirs
   if opts.library_dirs: