ああ、そういうことか。

$ dive_in /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin; ls -la swift swift-frontend swift-driver lrwxr-xr-x 1 norio staff 14 3 26 10:24 swift@ -> swift-frontend -rwxr-xr-x 1 norio staff 9265296 3 18 19:40 swift-driver* -rwxr-xr-x 1 norio staff 356405232 3 18 19:40 swift-frontend* $ DOCKER_UBUNTU_IMAGE=swift docker-ubuntu all contents will be removed after the container is stopped root@swift:~# cd /usr/bin root@swift:/usr/bin# ls -la swift swift-frontend swift-driver lrwxrwxrwx 1 root root 12 Dec 11 17:01 swift -> swift-driver -rwxr-xr-x 1 root root 38219560 Dec 11 18:23 swift-driver -rwxr-xr-x 1 root root 182984296 Dec 11 16:38 swift-frontend

macOSは swift -> swift-frontend Linuxは swift -> swift-driver だ。 (edited)