digitalmars.D.bugs - [Issue 21593] New: Only update file time if file to be written
- d-bugmail puremagic.com (23/23) Jan 29 2021 https://issues.dlang.org/show_bug.cgi?id=21593
https://issues.dlang.org/show_bug.cgi?id=21593 Issue ID: 21593 Summary: Only update file time if file to be written already exists Product: D Version: D2 Hardware: All OS: All Status: NEW Severity: enhancement Priority: P1 Component: dmd Assignee: nobody puremagic.com Reporter: bugzilla digitalmars.com This is a suggestion from Andrei. Because file writes are so much slower than reads, and because of weak dependency management in build systems, the compiler will often generate the same files again and again. This changes file writes to first see if the file already exists and is identical. If so, it just updates the last written time on that file instead of writing a new one. We discussed whether to "touch" the file or not, and decided if it wasn't touched, it would likely break many build systems. --
Jan 29 2021