On master (80c8a02f1b4f6ad2b5c02595d66a74db22373ed4) compiling with gcc:
$ ./configure --without-libs
$ make clean && make
...
test/script_tests.cpp:1369:23: warning: ‘CScriptWitness script_tests::ScriptWitnessFromJSON(const UniValue&)’ defined but not used [-Wunused-function]
1369 | static CScriptWitness ScriptWitnessFromJSON(const UniValue& univalue)
| ^~~~~~~~~~~~~~~~~~~~~
test/script_tests.cpp:1357:28: warning: ‘std::vector<CTxOut> script_tests::TxOutsFromJSON(const UniValue&)’ defined but not used [-Wunused-function]
1357 | static std::vector<CTxOut> TxOutsFromJSON(const UniValue& univalue)
| ^~~~~~~~~~~~~~
test/script_tests.cpp:1350:28: warning: ‘CMutableTransaction script_tests::TxFromHex(const string&)’ defined but not used [-Wunused-function]
1350 | static CMutableTransaction TxFromHex(const std::string& str)
| ^~~~~~~~~
...
This change is move-only (nice to review with git diff --color-moved).