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

Calculating dependencies ... done!
Dependency resolution took 1.02 s (backtrack: 0/20).

[ebuild  N     ] dev-libs/libcdio-2.4.0:0/21::gentoo  USE="cxx -cddb -minimal -static-libs -test" 1682 KiB

Total: 1 package (1 new), Size of downloads: 1682 KiB