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Add -O2 to the adding an op HOWTO (#4195)

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Based on a [request from StackOverflow](http://stackoverflow.com/questions/39280669/best-way-to-modify-a-built-in-tensorflow-kernel/39301780?noredirect=1#comment65975519_39301780) where a user observed that the same code compiled following these instructions is 10x slower than code built as part of the binary installation.
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Derek Murray 2016-09-04 15:52:21 -07:00 committed by Manjunath Kudlur
parent 68a74ea985
commit 2ab7e63262
1 changed files with 1 additions and 1 deletions
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tensorflow/g3doc/how_tos/adding_an_op/index.md
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@ -139,7 +139,7 @@ to compile your Op into a dynamic library.
```bash
TF_INC=$(python -c 'import tensorflow as tf; print(tf.sysconfig.get_include())')
g++ -std=c++11 -shared zero_out.cc -o zero_out.so -fPIC -I $TF_INC
g++ -std=c++11 -shared zero_out.cc -o zero_out.so -fPIC -I $TF_INC -O2
```
On Mac OS X, the additional flag "-undefined dynamic_lookup" is required when