[Rpm-maint] [rpm-software-management/rpm] RFE: optional one-shot/cached macro expansion (#1155)

[Panu Matilainen]

pmatilai left a comment (rpm-software-management/rpm#1155)

I have a working implementation of this that works by pushing the expansion on top of the original one-shot macro, as a literal macro as that's what I think most users would expect.

I'm just wondering if that should be left for the macro creator afterall, ie `mymacro<o>` would actually keep expanding on each use like the result of a `%global` does, and `mymacro<ol>` would really only expand once. The ability to differentiate seems kinda handy, but then I smell potential for lot of confusion as well.

There are all these related question surrounding `%global` too - does a one-shot macro actually expand twice if defined with `%global`? It seems a bit nuts, but then, one-shot is about the *time of use*, whereas `%global` (and the eventual `%define -e/-x`) are about time of definition. 🤔 

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