These are the packages that would be merged, in order:

Calculating dependencies ... done!
Dependency resolution took 0.97 s (backtrack: 0/20).

[ebuild  N     ] app-arch/cpio-2.15::gentoo  USE="nls" 1613 KiB
[ebuild  N     ] app-alternatives/cpio-0::gentoo  USE="gnu (split-usr) -libarchive" 0 KiB
[ebuild  N     ] app-arch/rpm2targz-2021.03.16::gentoo  7 KiB
[ebuild  N     ] sys-boot/shim-15.8::gentoo  USE="-secureboot" 880 KiB

Total: 4 packages (4 new), Size of downloads: 2499 KiB