[Rpm-maint] [rpm-software-management/rpm] RFE: BuildRequires generator (#104)

[nim-nim]

@ffesti You're complicating things unecessary, rpm does not distinguish between manual and dynamic provides, there's no need to distinguish between manual and dynamic BuildRequires either

In a dynamic BuildRequires world, the spec still contains static BuildRequires (sufficient to pull in the build root whatever is necessary to compute the dynamic BuildRequires) and the packager executes at the end of %prep whatever command or commands are appropriate to compute those BuildRequires

That allows the packager to "fix" the project state that serves as a base to the computation, to massage the command output if needed, etc

All it needs is an rpm entry point that pipes a string or a string list into the BuildRequires list during %prep, for mock or whatever to read the final BuildRequires state at the end of %prep and complete the build root as needed

If you want maximum flexibility you can even forget about %prep or not %prep, and do it with two spec verbs:
1. one verb that accepts piping new BuildRequires (one per line, without the BuildRequires prefix) or alternatively as arguments 
2. another verb that basically kicks the build system and tells it "add to the build root all the BuildRequires not already present"

and let packagers define the best dynamic BR strategy over time. Adding BRs just in time would simplify a lot of ifdefing in %build and %check for example: just request the BRs in the optional section instead of trying to sync several optional sections in different parts of the spec

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