commenting on previous merged emails:
> Yes, there are indeed Linux package managers. They don't get beyond the
> "replace the entire package" level. THey have no concept of individual
> fixes and their interactions.

> Are they as powerful as SMP? No, but they fill a similar niche.

They are more powerful than SMP (and to me scary).

They run scripts as root and can do anything to your system...

SMP is mostly contained, it's going to replace some modules.

One thought I had a long time ago on SMP was that a slightly different
design of SMP would only forward build the target libraries never save
them and recopy them back from the saved version (for restore).

Instead, this alternate would keep a pile of MODs, a dependency
database, and a local configuration database.  A new PTF or function
would add MODs and dependencies.

APPLY and RESTORE would adjust the local configuration database to say
what modules and versions the target libraries would contain.

Then a SMP build process would build or rebuild the targets needing
changes from the current configuration to the new desired configuration.
So any PTF could be removed, at least as long as the pile of MODs still
contained the older MODs needed.

Since this would require keeping may previous levels of modules and more
processing I can see why this wasn't likely possible back when disks
were smaller and more expensive and processors slower.

As well, the real SMP back then included the old LMOD in it's links so
"unknown to SMP" CSECTs didn't get lost.
 

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