tongsucn opened a new issue #7502:
URL: https://github.com/apache/pulsar/issues/7502
**Describe the bug**
When enabling `-Wall`, the library cannot be successfully compiled:
1. Non-virtual destructor in base class:
`pulsar-client-cpp/lib/auth/AuthOauth2.h:47:7: error: base class 'class
pulsar::CachedToken' has accessible non-virtual destructor
[-Werror=non-virtual-dtor]`.
2. Unnecessary NULL checking on function pointer:
`/pulsar-client-cpp/lib/ClientImpl.cc:100:10: error: the address of
'pulsar::Logger* logger()' will never be NULL [-Werror=address]`.
**To Reproduce**
Compile with `-Wall`.
**Desktop (please complete the following information):**
- OS: Linux
- Compiler: GCC 7.3
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