Have this warning while building current master (0bd4929cd00e91bf4137f43b097cd62f72f503e4) on one test machine.
```
wallet/rpcwallet.cpp: In function 'rescanblockchain()::<lambda(const RPCHelpMan&, const JSONRPCRequest&)>':
wallet/rpcwallet.cpp:3596:19: warning: '*((void*)& stop_height +4)' may be used uninitialized in this function [-Wmaybe-uninitialized]
 3596 |     Optional<int> stop_height;
      |                   ^~~~~~~~~~~
```
```
$ gcc --version
gcc (Gentoo 9.2.0-r2 p3) 9.2.0
Copyright (C) 2019 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

$ uname -a
Linux red-box 4.19.72-gentoo #2 SMP Sun Sep 22 03:00:01 EEST 2019 x86_64 Intel(R) Pentium(R) CPU N3710 @ 1.60GHz GenuineIntel GNU/Linux
```
if (!IsValidDestination(dest)) {
            throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Invalid Bitcoin address");
        }
        CScript script_pub_key = GetScriptForDestination(dest);
        if (!wallet.IsMine(script_pub_key)) {
            throw JSONRPCError(RPC_WALLET_ERROR, "Address not found in wallet");
        }
        address_set.insert(dest);
    }
    
    int min_depth = 1;
    if (!params[1].isNull())
        min_depth = params[1].get_int();
    
    CAmount amount = 0;
    for (const std::pair<const uint256, CWalletTx>& wtx_pair : wallet.mapWallet) {
        const CWalletTx& wtx = wtx_pair.second;
        if (wtx.IsCoinBase() || !wallet.chain().checkFinalTx(*wtx.tx) || wtx.GetDepthInMainChain() < min_depth) {
            continue;
        }
        for (const CTxOut& txout : wtx.tx->vout) {
            CTxDestination address;
            if (ExtractDestination(txout.scriptPubKey, address) && wallet.IsMine(address) && address_set.count(address)) {
                amount += txout.nValue;
            }
        }
    }
    return amount;
}
static RPCHelpMan getreceivedbyaddress()