It's a pipeline; clang starts, hands off to LLVM. For a compilation to object file from source code, the vast majority of time for most translation units when

It's a pipeline; clang starts, hands off to LLVM. For a compilation to object file from source code, the vast majority of time for most translation units when building the Linux kernel is spent in the front end of the pipeline, not the middle, or backend. See also my first plot: https://github.com/ClangBuiltLinux/linux/issues/1086#issuecomment-670685565 https://github.com/ClangBuiltLinux/linux/issues/1086#issueco...