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
```
UniValue detail = DescribeWalletAddress(pwallet, dest);
    ret.pushKVs(detail);
    ret.pushKV("ischange", pwallet->IsChange(scriptPubKey));
    ScriptPubKeyMan* spk_man = pwallet->GetScriptPubKeyMan(scriptPubKey);
    if (spk_man) {
        if (const std::unique_ptr<CKeyMetadata> meta = spk_man->GetMetadata(dest)) {
            ret.pushKV("timestamp", meta->nCreateTime);
            if (meta->has_key_origin) {
                ret.pushKV("hdkeypath", WriteHDKeypath(meta->key_origin.path));
                ret.pushKV("hdseedid", meta->hd_seed_id.GetHex());
                ret.pushKV("hdmasterfingerprint", HexStr(meta->key_origin.fingerprint));
            }
        }
    }
    
    
    
    
    
    UniValue labels(UniValue::VARR);
    const auto* address_book_entry = pwallet->FindAddressBookEntry(dest);
    if (address_book_entry) {
        labels.push_back(address_book_entry->GetLabel());
    }
    ret.pushKV("labels", std::move(labels));
    return ret;
},
    };
}
static RPCHelpMan getaddressesbylabel()