https://issues.dlang.org/show_bug.cgi?id=13517
--- Comment #18 from Steven Schveighoffer <[email protected]> --- I would add a stipulation that if the purpose of the compiler invocation is ONLY to build the .di file, then the compiler should rewrite it. So dmd -c -o- -H should still touch the .di file even if it's identical to the existing one. Otherwise, this disfavors a build system where the .di is built as a separate step (and causes a continual "rebuild" of a .di file every time the build is called). --
