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

Calculating dependencies ... done!
Dependency resolution took 1.01 s (backtrack: 0/20).

[ebuild  N     ] dev-libs/libcdio-2.1.0-r2:0/19::gentoo  USE="cxx -cddb -minimal -static-libs -test" 1718 KiB

Total: 1 package (1 new), Size of downloads: 1718 KiB