sourcekit-lsp/Documentation/Using SourceKit-LSP with Embedded Projects.md

Using SourceKit-LSP with Embedded Projects

If you need to pass additional options in the swift build invocation to build your project, SourceKit-LSP needs to know about these as well to fully understand your project. To tell SourceKit-LSP about these options, add a .sourcekit-lsp/config.json file to your project’s root folder and add the arguments you pass to swift build to that configuration file as described here.

For example, if you use the following invocation to build your project

swift build \
  --configuration release \
  --triple armv7em-apple-none-macho \
  -Xcc -D__APPLE__ -Xcc -D__MACH__ \
  -Xswiftc -Xfrontend -Xswiftc -disable-stack-protector

Then the .sourcekit-lsp/config.json file should contain

{
  "swiftPM": {
    "configuration": "release",
    "triple": "armv7em-apple-none-macho",
    "cCompilerFlags": ["-D__APPLE__", "-D__MACH__"],
    "swiftCompilerFlags": ["-Xfrontend", "-disable-stack-protector"]
  }
}