[Rpm-maint] [rpm-software-management/rpm] "setarch i386 rpmbuild ... " no longer working for building 32-bit packages on x86_64 host (Issue #2850)

[Michal Domonkos]

This is caused by the [x86-64 architecture levels patch](https://github.com/rpm-software-management/rpm/commit/cd46c1704ccd8eeb9b600729a0a1c8738b66b847) shipped in 4.19.0. When determining the target architecture internally in `rpmPlatform()`, we use `uname(2)` to obtain the system architecture, however with the above patch, it gets overridden from `i386` (when using `setarch(8)`) to the respective `x86_64` level that's detected.

As a workaround, you can use `rpmbuild --target i386` which actually overrides native architecture detection as expected.

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