SpECTRE code is frequently run through the Clang Tidy static analyzer. Since analyzing a single source file can take over half a minute it is generally not advisable to run clang-tidy over the entire code base. If CMake isn't finding clang-tidy, make sure clang-tidy is installed and that you have chosen clang as your compiler. To analyze a single source file run, for example make clang-tidy FILE=/path/to/source/src/DataStructures/DataVector.cpp. To analyze the entire code base run make clang-tidy-all. To analyze all changed C++ source files in the commits from FIRST_HASH to HEAD, run make clang-tidy-hash HASH=FIRST_HASH.