print-target-info: Temporary Directory isn't cleaned up on Linux/FreeBSD

[etcwilde]

Summary

The swift-driver doesn't delete the temporary directory on termination after running an in-place job. The ultimately led to the FreeBSD CI node running out of inodes and being unable to make progress without intervention. Unlike the Linux CI nodes, the /tmp directory on the FreeBSD node is non-volatile, and the directories are persisted.

Reproducer

cd /tmp
ls -a
swiftc -print-target-info
ls -a

Output:

bash-5.2# cd /tmp
bash-5.2# ls -a
.  ..
bash-5.2# swiftc -print-target-info
{
  "compilerVersion": "Swift version 6.2.1 (swift-6.2.1-RELEASE)",
  "target": {
    "triple": "aarch64-unknown-linux-gnu",
    "unversionedTriple": "aarch64-unknown-linux-gnu",
    "moduleTriple": "aarch64-unknown-linux-gnu",
    "platform": "linux",
    "arch": "aarch64",
    "pointerWidthInBits": 64,
    "pointerWidthInBytes": 8,
    "compatibilityLibraries": [ ],
    "openbsdBTCFIEnabled": false,
    "librariesRequireRPath": false
  },
  "paths": {
    "runtimeLibraryPaths": [
      "/usr/libexec/swift/6.2.1/lib/swift/linux"
    ],
    "runtimeLibraryImportPaths": [
      "/usr/libexec/swift/6.2.1/lib/swift/linux",
      "/usr/libexec/swift/6.2.1/lib/swift/linux/aarch64"
    ],
    "runtimeResourcePath": "/usr/libexec/swift/6.2.1/lib/swift"
  }
}
bash-5.2# ls -a
.  ..  TemporaryDirectory.21lDYL

Swift Version

This reproduces with 6.2 up to main.

Swift version 6.2.1 (swift-6.2.1-RELEASE)
Target: aarch64-unknown-linux-gnu

Linux 4c7f818f-45a9-4139-a5e0-d6d0631461f4 6.6.9 #1 SMP Fri Sep  5 23:08:25 UTC 2025 aarch64 aarch64 aarch64 GNU/Linux

Swift version 6.2-dev (LLVM 5ddb183dc9df433, Swift d8cbb57304b636a)
Target: x86_64-unknown-freebsd14.3
Build config: +assertions

FreeBSD latte 14.3-RELEASE FreeBSD 14.3-RELEASE releng/14.3-n271432-8c9ce319fef7 GENERIC amd64