removed (some) trivial unused variable warnings

[edeforas]

works not finished, but these ones are trivial

[beru]

LGTM

[beru]

I cannot merge this PR because passing Travis CI build is required.

@nyanp @edgarriba Can I remove osx build jobs from .travis.yml file?
It's broken and no longer maintained.

[edgarriba]

@beru sure, go ahead. Open an issue to address this error so others can fix it in the future.

[beru]

@beru sure, go ahead. Open an issue to address this error so others can fix it in the future.

@edgarriba I've just opened the issue. #1009

[hzxie]

The main problem cause the build error on macOS is that pip is not installed.

Solution 1

Remove pip install --user cpplint

Because cpplint is no longer used in CI.

Solution 2

I'm not sure whether the solution works or not.

According to the issue in Travis CI, you can change it to:

pip3 install --user cpplint

Solution 3

Install pip with the following command:

curl https://bootstrap.pypa.io/get-pip.py -o get-pip.py
python get-pip.py