Many complex C++ codebases have full parallel CI pipelines for GCC and LLVM. It encourages good code hygiene and occasionally identifies bugs in the compiler to

Many complex C++ codebases have full parallel CI pipelines for GCC and LLVM. It encourages good code hygiene and occasionally identifies bugs in the compiler toolchain. If you are using intrinsics or other architecture-specific features, there is a similar practice of requiring full CI pipelines for at least two CPU architectures. Again, it occasionally finds interesting bugs. For systems I work on we usually have 4 CI pipelines for the combo of GCC/LLVM and ARM/x86 for these purposes. It costs a bit more but is generally worth it from a code quality perspective.