1. Build with Clang
```
export CC=/usr/bin/clang
export CXX=/usr/bin/clang++
cmake .. -GNinja
ninja check
```
Verify that the compiler has not emitted the following warning:
EXCLUSIVE_LOCK_REQUIRED is a clang-only annotation that throw a -Wthread-safety-analysis
```
make check-all
```
```
./src/bitcoind -regtest
```