[CLI] Only generate files if contents change. - Githubissues

qmk / qmk_firmware

Open-source keyboard firmware for Atmel AVR and Arm USB families

https://qmk.fm

GNU General Public License v2.0

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[CLI] Only generate files if contents change. #24038

Open tzarc opened 3 days ago

tzarc commented 3 days ago

Description

Compilation tends to do everything each time -- we're constantly generating files as a precursor to a build, which updates mtimes and the like.

If regenerating the file doesn't change the content, then don't perform the write.

Doing rebuilds of the same board are significantly faster as a result.

Types of Changes

[x] Core
[x] Bugfix
[ ] New feature
[x] Enhancement/optimization
[ ] Keyboard (addition or update)
[ ] Keymap/layout/userspace (addition or update)
[ ] Documentation

Checklist

[x] My code follows the code style of this project: C, Python
[x] I have read the PR Checklist document and have made the appropriate changes.
[ ] My change requires a change to the documentation.
[ ] I have updated the documentation accordingly.
[x] I have read the CONTRIBUTING document.
[ ] I have added tests to cover my changes.
[x] I have tested the changes and verified that they work and don't break anything (as well as I can manage).