cpp examples fail to compile on master?

[Tanuj Khattar]

Hi Everyone, 

I want to use Protobufs for one of my bazel based C++ projects and I'm struggling to get a basic setup working. It seems the c++ examples on the master branch are also broken and fail to compile? 

See https://colab.research.google.com/drive/1dlCsApnVHW3rT7qM6jlNXCuJv3t_9IkV?usp=sharing for more details. I'm seeing the same errors on my local machine as well. 

Steps to reproduce:

```

> bazel --version 

bazel 5.3.0
> git clone https://github.com/protocolbuffers/protobuf.git && cd protobuf/examples
> bazel build :all

# Build fails. 

```

Can someone please look into the issue? 

Thanks

Tanuj

[Mike Kruskal]

Hey Tanuj,

This seems like a bug in our Bazel/testing setup.  I'll follow up on this separately, but if you just add the options `--cxxopt=-std=c++14 --host_cxxopt=-std=c++14` to the bazel command or to your `.bazelrc` file it should work.  e.g. this builds for me:

bazel build :all --cxxopt=-std=c++14 --host_cxxopt=-std=c++14

-Mike

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