---
title: clangPreprocessorDefinitions
framework: Swift Package Manager
role: symbol
role_heading: Instance Property
platforms: [swiftpm 6.5+]
path: swift-package-manager/documentation/packageplugin/swiftsourcemoduletarget/clangpreprocessordefinitions
---

# clangPreprocessorDefinitions

Any preprocessor definitions for the C-family sources of the module.

## Declaration

```swift
var clangPreprocessorDefinitions: [String] { get }
```