Allow caller of setup.py to pass in libopenvswitch.a as an object
for linking through the use of LDFLAGS environment variable when
not building a shared openvswitch library.

To accomplish this set the `enable_shared` environment variable to
'no'.

Example:
    LDFLAGS=lib/libopenvswitch.a enable_shared=no setup.py install

Signed-off-by: Frode Nordahl <[email protected]>
---
 python/setup.py | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/python/setup.py b/python/setup.py
index cfe01763f..b6e88e98e 100644
--- a/python/setup.py
+++ b/python/setup.py
@@ -10,6 +10,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import os
 import sys
 
 from distutils.command.build_ext import build_ext
@@ -63,6 +64,15 @@ class try_build_ext(build_ext):
             raise BuildFailed()
 
 
+# allow caller of setup.py to pass in libopenvswitch.a as an object for linking
+# through the use of LDFLAGS environment variable when not building a shared
+# openvswitch library.
+if 'enable_shared' in os.environ and os.environ['enable_shared'] == 'no':
+    json_libraries = []
+else:
+    json_libraries = ['openvswitch']
+
+
 setup_args = dict(
     name='ovs',
     description='Open vSwitch library',
@@ -85,7 +95,7 @@ setup_args = dict(
         'Programming Language :: Python :: 3.5',
     ],
     ext_modules=[setuptools.Extension("ovs._json", sources=["ovs/_json.c"],
-                                      libraries=['openvswitch'])],
+                                      libraries=json_libraries)],
     cmdclass={'build_ext': try_build_ext},
     install_requires=['sortedcontainers'],
     extras_require={':sys_platform == "win32"': ['pywin32 >= 1.0']},
-- 
2.36.1

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