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

Calculating dependencies ... done!
Dependency resolution took 1.04 s (backtrack: 0/20).

[ebuild  N     ] dev-libs/aws-c-common-1.0.3:0/1.0::gentoo  USE="-test" 641 KiB
[ebuild  N     ] dev-libs/s2n-tls-1.7.12:1::gentoo  USE="-test" 4853 KiB
[ebuild  N     ] dev-libs/aws-c-cal-1.0.0:0/1.0::gentoo  USE="-test" 1664 KiB
[ebuild  N     ] dev-libs/aws-checksums-1.0.0:0/1.0::gentoo  USE="-test" 217 KiB
[ebuild  N     ] dev-libs/aws-c-compression-1.0.0:0/1.0::gentoo  USE="-test" 39 KiB
[ebuild  N     ] dev-libs/aws-c-sdkutils-1.0.0:0/1.0::gentoo  USE="-test" 114 KiB
[ebuild  N     ] dev-libs/aws-c-io-1.1.0:0/1.1::gentoo  USE="-test" 810 KiB
[ebuild  N     ] dev-libs/aws-c-http-1.1.1:0/1.1::gentoo  USE="-test" 526 KiB
[ebuild  N     ] dev-libs/aws-c-event-stream-1.0.0:0/1.0::gentoo  USE="-test" 105 KiB
[ebuild  N     ] dev-libs/aws-c-auth-1.0.1:0/1.0::gentoo  USE="-test" 285 KiB
[ebuild  N     ] dev-libs/aws-c-mqtt-1.1.2:0/1.1-fixed::gentoo  USE="-test" 464 KiB
[ebuild  N     ] dev-libs/aws-c-s3-1.3.1:0/1.3::gentoo  USE="-test" 559 KiB
[ebuild  N     ] dev-cpp/aws-crt-cpp-0.42.3::gentoo  USE="-test" 393 KiB

Total: 13 packages (13 new), Size of downloads: 10664 KiB