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Add instruction on how to handle the potential linker error on Linux (#47593)

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Summary:
The original issue is https://github.com/pytorch/pytorch/issues/16683, which contains a https://github.com/pytorch/pytorch/issues/16683#issuecomment-459982988 that suggests manually un-shadowing the `ld`.

A better approach can be found at https://github.com/ContinuumIO/anaconda-issues/issues/11152#issuecomment-573120962, which suggests that using a newer version can effectively fix this.

It took me quite some time to realize that this is in fact an issue caused by Anaconda. I think we should add it in README.

Pull Request resolved: https://github.com/pytorch/pytorch/pull/47593

Reviewed By: ailzhang

Differential Revision: D24866092

Pulled By: heitorschueroff

fbshipit-source-id: c1f51864d23fd6f4f63a117496d8619053e35196
This commit is contained in:
skyline75489
2020-11-11 14:22:09 -08:00
committed by Facebook GitHub Bot
parent 7864ae9f98
commit fcd44ce698
1 changed files with 11 additions and 1 deletions
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12
README.md
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@ -149,7 +149,7 @@ They require JetPack 4.2 and above, and [@dusty-nv](https://github.com/dusty-nv)
### From Source
If you are installing from source, you will need Python 3.6 or later and a C++14 compiler. Also, we highly recommend installing an [Anaconda](https://www.anaconda.com/distribution/#download-section) environment.
If you are installing from source, you will need Python 3.6.2 or later and a C++14 compiler. Also, we highly recommend installing an [Anaconda](https://www.anaconda.com/distribution/#download-section) environment.
You will get a high-quality BLAS library (MKL) and you get controlled dependency versions regardless of your Linux distro.
Once you have [Anaconda](https://www.anaconda.com/distribution/#download-section) installed, here are the instructions.
@ -207,6 +207,16 @@ export CMAKE_PREFIX_PATH=${CONDA_PREFIX:-"$(dirname $(which conda))/../"}
python setup.py install
```
Note that if you are using [Anaconda](https://www.anaconda.com/distribution/#download-section), you may experience an error caused by the linker:
```plaintext
build/temp.linux-x86_64-3.7/torch/csrc/stub.o: file not recognized: file format not recognized
collect2: error: ld returned 1 exit status
error: command 'g++' failed with exit status 1
```
This is caused by `ld` from Conda environment shadowing the system `ld`. You should use a newer version of Python that fixes this issue. The recommended Python version is 3.6.10+, 3.7.6+ and 3.8.1+.
On macOS
```bash
export CMAKE_PREFIX_PATH=${CONDA_PREFIX:-"$(dirname $(which conda))/../"}