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[patch] refine make regen to be more selective

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Jim Cromie
March 11, 2008 10:39
[patch] refine make regen to be more selective
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make regen will currently cause recompilation of everything.

this patch makes it more selective

1 - copies do_cksum from to, and simplifies it.
    This includes a change to unpack arg, to use U rather than C.
    It has no apparent effect, but seems worth noting here.

2 - uses it in safer_rename() to be more selective

3 - various fixups in *.pl-s called by
    (remove unlink()s so comparison between old and new works)

This may expose some missing dependencies, which were covered by 
brute-force regen

It should allow 'regen' target to be rolled into 'all'

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