[ET Trac] [Einstein Toolkit] #1540: Use clang for automated testing

#1540: Use clang for automated testing -------------------------+-------------------------------------------------- Reporter: eschnett | Owner: Type: enhancement | Status: new Priority: minor | Milestone: Component: Other | Version: development version Keywords: | -------------------------+-------------------------------------------------- We should use Clang for automated testing, maybe in addition to GCC. Clang is known for having better diagnostics than GCC. Point in case: Clang discovered the C/C++ incompatibility for complex numbers that GCC ignored.