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scripts: uuid-registry: only write header when content changes #11154

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scripts: uuid-registry: only write header when content changes #11154

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21 changes: 17 additions & 4 deletions scripts/gen-uuid-reg.py
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Original file line number Diff line number Diff line change
Expand Up @@ -55,11 +55,24 @@ def main():
emit_uuid_rec(uu, sym)
print(f"Added UUID {uu} with symbol {sym}")

new_content = header + "".join(l + "\n" for l in out_recs) \
+ "#endif /* _UUID_REGISTRY_H */\n"

# Write only when the content actually changed. This header is
# force-included (-imacros) into nearly every SOF translation unit,
# so rewriting it unconditionally would bump its mtime on every
# build and make Ninja recompile the whole tree even when the UUID
# registry is unchanged. Same idea as sof_check_version_h() in
# scripts/cmake/version.cmake for sof_versions.h.
try:
with open(sys.argv[2]) as f:
if f.read() == new_content:
return
except FileNotFoundError:
pass

with open(sys.argv[2], "w") as f:
f.write(header)
for l in out_recs:
f.write(l + "\n")
f.write("#endif /* _UUID_REGISTRY_H */\n")
f.write(new_content)

if __name__ == "__main__":
main()
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