kou commented on pull request #7397:
URL: https://github.com/apache/arrow/pull/7397#issuecomment-642989620
The command line that causes this link error has the following arguments in
this order:
* ...
* `/usr/lib/s390x-linux-gnu/libssl.so`
* ...
* `/usr/lib/s390x-linux-gnu/libssl.so`
* ...
* `grpc_ep-install/lib/libgrpc++.a`
* ....
* `/usr/lib/s390x-linux-gnu/libssl.so`
* ...
* `/usr/lib/s390x-linux-gnu/libssl.so`
* ...
* `grpc_ep-install/lib/libgrpc.a`
* ...
It seems that we need `libssl.so` after `libgrpc.a` because `libgrpc.a` uses
`d2i_SSL_SESSION`:
```console
$ nm grpc_ep-install/lib/libgrpc.a | grep d2i_SSL_SESSION
U d2i_SSL_SESSION
```
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