scripts: uuid-registry: only write header when content changes - #11154
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kv2019i wants to merge 1 commit into
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scripts: uuid-registry: only write header when content changes#11154kv2019i wants to merge 1 commit into
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Every invocation of gen-uuid-reg.py rewrites uuid-registry.h with open(..., "w"), updating the file's mtime even when the generated content was byte-for-byte identical. The uuid-registry.cmake custom command that runs this script executes on every build (it is wired into zephyr_interface via the uuid_reg_h target), and the header is force-included with -imacros into nearly every SOF translation unit. As a result, incremental builds in practise rebuild all objects even if no code is changed. Fix incremental builds by only updating uuid-registery if the content changes. Signed-off-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
kv2019i
requested review from
dbaluta,
lbetlej,
lgirdwood,
mmaka1 and
plbossart
as code owners
September 2, 2026 08:20
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🟢 Approval recommended
The change is localized, preserves the generated output format, and prevents unnecessary rebuilds by avoiding no-op rewrites.
Pull request overview
Updates gen-uuid-reg.py to avoid rewriting the generated uuid-registry.h when the output would be identical, preventing unnecessary timestamp changes that cascade into widespread incremental rebuilds (since the header is force-included into many translation units).
Changes:
- Build the full generated header content as a single string (
new_content). - Compare against the existing output file and return early when unchanged.
- Write the header in a single
f.write()when an update is needed.
File summaries
| File | Description |
|---|---|
| scripts/gen-uuid-reg.py | Avoids unconditional rewrites of the generated UUID registry header to improve incremental build performance. |
Review details
- Files reviewed: 1/1 changed files
- Comments generated: 0
- Review effort level: Lite
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abonislawski
approved these changes
Sep 2, 2026
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Every invocation of gen-uuid-reg.py rewrites uuid-registry.h with open(..., "w"), updating the file's mtime even when the generated content was byte-for-byte identical. The uuid-registry.cmake custom command that runs this script executes on every build (it is wired into zephyr_interface via the uuid_reg_h target), and the header is force-included with -imacros into nearly every SOF translation unit. As a result, incremental builds in practise rebuild all objects even if no code is changed.
Fix incremental builds by only updating uuid-registery if the content changes.