[Rpm-maint] [rpm-software-management/rpm] [RFE] Provide install time alternative to `%{?_isa}` (#1344)

[Vít Ondruch]

It would be nice if we had install time alternative to `%{?_isa}`. That would help to pull in the right arch package from noarch package.

My use case is to have rubygem-ruby-vips, where this is noarch package is using libffi to load libraries, to `Requires: "libvips.so.42%{?_isa}", where this would pull in the right library according to target installation platform.

This [[1]] is the original ticket I have reported against DNF just to just discover that DNF is doing the right thing when rubygem-ruby-vips specifies only `Requires: "libvips.so.42`. Obviously, specifying `Requires: "libvips.so.42%{?_isa}` would not improve the situation, because the randomly used builder arch would make the issue even worse.

[1]: https://bugzilla.redhat.com/show_bug.cgi?id=1870275

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