Instead of copying, symlink to correct ABI versions

Change-Id: I0ac05266e96dd64e881f0b3e746df69432446fa2

python/setup.py

@@ -17,19 +17,20 @@
 # specific language governing permissions and limitations
 # under the License.
 
+import glob
+import os
 import os.path as osp
 import re
 import shutil
+import sys
+
 from Cython.Distutils import build_ext as _build_ext
 import Cython
 
-import sys
 
 import pkg_resources
 from setuptools import setup, Extension
 
-import os
-
 from os.path import join as pjoin
 
 from distutils.command.clean import clean as _clean
@@ -210,10 +211,17 @@ class build_ext(_build_ext):
                             shared_library_suffix)
             # Also copy libraries with ABI/SO version suffix
             libs = glob.glob(pjoin(self.build_type, lib_filename) + '*')
-            for lib in libs:
+            # Longest suffix library should be copied, all others symlinked
+            libs.sort(key=lambda s: -len(s))
+            print(libs, libs[0])
+            lib_filename = os.path.basename(libs[0])
+            shutil.move(pjoin(self.build_type, lib_filename),
+                        pjoin(build_lib, 'pyarrow', lib_filename))
+            for lib in libs[1:]:
                 filename = os.path.basename(lib)
-                shutil.move(pjoin(self.build_type, filename),
-                            pjoin(build_lib, 'pyarrow', filename))
+                link_name = pjoin(build_lib, 'pyarrow', filename)
+                if not os.path.exists(link_name):
+                    os.symlink(lib_filename, link_name)
 
         if self.bundle_arrow_cpp:
             move_lib("arrow")