test_custom.py errors

[lixinfan]

After compiling the "simple" example, custom.so is properly created:
Makefile custom_op.h custom_op_cpu.h custom_op_gpu.cu custom_op_gpu.o
custom.so custom_op_cpu.cpp custom_op_cpu.o custom_op_gpu.cuh test_custom.py

But running test_custom.py resulted in a "./custom.so: undefined symbol" error as follows. Any ideas about how to fix it? I am testing with tfopgen (0.2.4) and tensorflow (1.1.0-rc2), in case it matters.

python test_custom.py
E

ERROR: test_custom (main.TestCustom)
Test the Custom operator

Traceback (most recent call last):
File "test_custom.py", line 12, in setUp
self.custom = tf.load_op_library('./custom.so')
File "/usr/local/lib/python2.7/dist-packages/tensorflow/python/framework/load_library.py", line 64, in load_op_library
None, None, error_msg, error_code)
NotFoundError: ./custom.so: undefined symbol: _ZN10tensorflow8internal21CheckOpMessageBuilder9NewStringEv

---

Ran 1 test in 0.015s

FAILED (errors=1)

[lixinfan]

I managed to solve the problem, by commenting out following flag in the generated Makefile
# -D_GLIBCXX_USE_CXX11_ABI=0

I am not sure about causes of the problem and the solution, but the idea came from this tensforflow issue disucssion: tensorflow/tensorflow#4118