Description

Even with .interoperabilityMode(.Cxx) enabled, it still can't find the <swift/bridging> header for a hpp file on Linux SDK.

The current workaround is adding the SDK search path manually.

eg.

.unsafeFlags(["-I", "/home/kyle/.swiftbox/toolchain/swift-6.1.2/usr/include/"]) 

It works for simple demo package but would introduce other header issue on a large project.

Reproduction

. ├── Package.swift └── Sources ├── AKit │   ├── A.cpp │   └── include │   └── A.hpp └── BKit └── main.swift

// A.hpp #include <swift/bridging> 

Package.swift:

// swift-tools-version: 6.1 import PackageDescription let package = Package( name: "DemoKit", products: [ .executable(name: "BKit", targets: ["BKit"]) ], targets: [ .target( name: "AKit", ), .executableTarget( name: "BKit", dependencies: ["AKit"], swiftSettings: [ .interoperabilityMode(.Cxx), // .unsafeFlags(["-I", "/home/kyle/.swiftbox/toolchain/swift-6.1.2/usr/include/"]), ] ), ] )

Full reproduce package code can be found here.
DemoKit.zip

Expected behavior

Build successfully like macOS platform

Environment

swiftc --version
Swift version 6.1 (swift-6.1-RELEASE)
Target: aarch64-unknown-linux-gnu

Additional information

Forums Link