I try run swing 5.3.2 on clion on ubuntu 20.10 and return this :
/opt/opt/swift/usr/bin/swift build --build-tests --build-path /home/etienne/CLionProjects/swift/Project/.build
[1/4] Merging module ProjectTests
:0: error: error opening '/home/etienne/CLionProjects/swift/Project/.build/x86_64-unknown-linux-gnu/debug/Project/ProjectTests.swiftsourceinfo' for output: Not a directory
:0: error: merge-module command failed with exit code 1 (use -v to see invocation)