Changyu Bi 496eebaee8 Fix compilation error using CLANG (#13864)
Summary:
fix the following error showing up in continuous tests:
```
Makefile:186: Warning: Compiling in debug mode. Don't use the resulting binary in production
port/mmap.cc:46:15: error: first argument in call to 'memcpy' is a pointer to non-trivially copyable type 'rocksdb::MemMapping' [-Werror,-Wnontrivial-memcall]
   46 |   std::memcpy(this, &other, sizeof(*this));
      |               ^
port/mmap.cc:46:15: note: explicitly cast the pointer to silence this warning
   46 |   std::memcpy(this, &other, sizeof(*this));
      |               ^
      |               (void*)
1 error generated.
make: *** [Makefile:2580: port/mmap.o] Error 1
make: *** Waiting for unfinished jobs....
```

Pull Request resolved: https://github.com/facebook/rocksdb/pull/13864

Test Plan: `make USE_CLANG=1 j=150 check` with https://github.com/facebook/rocksdb/blob/13f054febb26100184eeefaac11877d735d45ac2/build_tools/build_detect_platform#L61-L70 commented out.

Reviewed By: mszeszko-meta

Differential Revision: D80033441

Pulled By: cbi42

fbshipit-source-id: b2330eea71fe28243236b75128ec6f3f1e971873
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RocksDB: A Persistent Key-Value Store for Flash and RAM Storage

CircleCI Status

RocksDB is developed and maintained by Facebook Database Engineering Team. It is built on earlier work on LevelDB by Sanjay Ghemawat (sanjay@google.com) and Jeff Dean (jeff@google.com)

This code is a library that forms the core building block for a fast key-value server, especially suited for storing data on flash drives. It has a Log-Structured-Merge-Database (LSM) design with flexible tradeoffs between Write-Amplification-Factor (WAF), Read-Amplification-Factor (RAF) and Space-Amplification-Factor (SAF). It has multi-threaded compactions, making it especially suitable for storing multiple terabytes of data in a single database.

Start with example usage here: https://github.com/facebook/rocksdb/tree/main/examples

See the github wiki for more explanation.

The public interface is in include/. Callers should not include or rely on the details of any other header files in this package. Those internal APIs may be changed without warning.

Questions and discussions are welcome on the RocksDB Developers Public Facebook group and email list on Google Groups.

License

RocksDB is dual-licensed under both the GPLv2 (found in the COPYING file in the root directory) and Apache 2.0 License (found in the LICENSE.Apache file in the root directory). You may select, at your option, one of the above-listed licenses.

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