[Rpm-maint] [rpm-software-management/rpm] %buildsubdir not defined in manual spec sections of specs using declarative buildsystem (Issue #3890)

[Panu Matilainen]

pmatilai left a comment (rpm-software-management/rpm#3890)

Having slept a few nights on this, I think the sanest way out of this is to export the BUILDSUBDIR and/or the full build directory as environment variables to the build scripts. It's a little hysterical that it isn't already, isn't it?

And maybe we can then override %buildsubdir to the environment variable name, so that it gets evaluated inside the build instead of the spec parse. Like we do with %_smp_mflags, for similar reasons.

%buildsubdir is actually just another example how macros became way overused (over the last 20+ years) for various build-time tasks where environment variables would've been a better fit. Macros are spec parse time things where various things about the *build* environment simply are not yet known. And so, would be better off left to environment variables.

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