Cc: @craig.scott @marc.chevrier `CMakeTest*Compiler.cmake` and `CMakeDetermineCompilerABI.cmake` each do a `try_compile` to test and then introspect the compiler. #18700 demonstrates how much each initialization check can affect small projects (and CMake's test suite). I suspect it is possible to combine the roles of `CMakeTest*Compiler.cmake` and `CMakeDetermineCompilerABI.cmake` into a single `try_compile` call.