[Rpm-maint] [rpm-software-management/rpm] %_target_cpu and various other macros are wrong in during build in BuildArch packages (Issue #3049)

[Panu Matilainen]

One report of the issue is here: https://bugzilla.redhat.com/show_bug.cgi?id=2069163 but also ran into this in various other circumstances, eg #2319 and %ifarch not working in dynamic spec parts.

The spec parsing recurses through build architectures, pushing and popping %_target_cpu as it goes, and the last pop leaves the value to whatever the host is, ie almost certainly wrong and always wrong for noarch packages. It's not just %_target_cpu though, RPM_ARCH environment variable in the build scriptlets gets set from %_arch which is similarly off, and then there's %_libdir, %optflags and all.

This affects both dynamically generated .specpart and the templated parts that get expanded during doScript().

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