[nuclide-swift]: Can't set Swift compiler flags

[pkrll]

Issue and Steps to Reproduce

The build fails when I try to pass any flag to the Swift compiler using Nuclides build configuration pane.

I set the Swift compile flags to "-D" -Xswiftc "DEBUG", and then just press the build button. If I remove the flags, everything works fine.

The command shown in the console (/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift build --chdir /Users/USER/Public/Test --configuration debug -Xswiftc "-D" -Xswiftc "DEBUG") works as intended when I copy & paste it in the Terminal.

Expected Behavior

A successful compilation process.

Actual Behavior

The build process fails with the message: <unknown>:0: error: no such file or directory: '"-D" -Xswiftc "DEBUG"'.

The full output:

/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift build --chdir /Users/USER/Public/Test --configuration debug -Xswiftc "-D" -Xswiftc "DEBUG"

(2) <unknown>:0: error: no such file or directory: '"-D" -Xswiftc "DEBUG"'

warning: '--chdir/-C' option is deprecated; use '--package-path' instead

error: terminated(1): /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift-build-tool -f /Users/USER/Public/Test/.build/debug.yaml main output:

/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift failed with exit code 1

Build succeeded.

Versions

• Atom: 1.27.2
• Nuclide: 0.315.0
• Client OS: macOS High Sierra 10.13.5

Additional Details

• Installed packages (apm ls --installed):
  ├── advanced-open-file@0.16.8
  ├── atom-ide-ui@0.12.0 (disabled)
  ├── atom-material-syntax@1.0.8
  ├── atom-material-ui@2.1.3
  ├── atomic-emacs@0.12.1
  ├── autocomplete-python@1.10.5 (disabled)
  ├── build@0.70.0 (disabled)
  ├── build-make@0.13.0 (disabled)
  ├── busy-signal@1.4.3
  ├── dash@1.7.1
  ├── deep-space-syntax@1.1.0
  ├── doc-green-syntax@1.1.0
  ├── doc-green-ui@1.1.0
  ├── docblockr@0.13.7
  ├── docs-snippets@0.8.0 (disabled)
  ├── editorconfig@2.2.2
  ├── file-icons@2.1.21
  ├── git-time-machine@2.1.0 (disabled)
  ├── ide-java@0.8.3 (disabled)
  ├── ide-php@0.7.14 (disabled)
  ├── intentions@1.1.5 (disabled)
  ├── language-apache@1.8.0 (disabled)
  ├── language-applescript@0.3.0 (disabled)
  ├── language-haskell@1.17.7 (disabled)
  ├── language-htaccess@0.2.0 (disabled)
  ├── language-latex@1.1.1 (disabled)
  ├── language-mips@0.3.0 (disabled)
  ├── language-restructuredtext@1.1.2 (disabled)
  ├── language-rust@0.4.12 (disabled)
  ├── language-swift@0.5.0
  ├── language-vue@0.23.1 (disabled)
  ├── language-vue-component@0.5.0 (disabled)
  ├── latex@0.50.0 (disabled)
  ├── line-count@0.5.0
  ├── linter@2.2.0 (disabled)
  ├── linter-clang@4.1.2 (disabled)
  ├── linter-javac@1.9.4 (disabled)
  ├── linter-rust@0.9.0 (disabled)
  ├── linter-swiftlint@1.3.1
  ├── linter-ui-default@1.7.1 (disabled)
  ├── material-syntax@0.6.1
  ├── minimap@4.29.8
  ├── monokai@0.24.0
  ├── multi-cursor@2.1.5
  ├── nucleus-dark-ui@0.12.3
  ├── nuclide@0.315.0
  ├── packages
  ├── remote-atom@1.3.12 (disabled)
  ├── remote-ftp@2.2.0 (disabled)
  ├── rusty-dark-syntax@0.7.0
  ├── script@3.18.1
  ├── set-syntax@0.4.0
  ├── seti-syntax@1.1.3
  ├── seti-ui@1.10.0
  ├── slime@2.4.0
  ├── swift-debugger@0.1.2 (disabled)
  ├── teletype@0.13.3 (disabled)
  ├── todo-show@2.3.0
  └── wakatime@7.0.4