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// swift-tools-version: 5.8
import PackageDescription
let package = Package(
name: "FuzzTesting",
products: [
// Discussion: Why we build libraries instead of executables linking libFuzzer?
//
// First, libclang_rt.fuzzer.a defines the main function for the fuzzing process
// and object files given by the user are expected not to have a "main" function
// to avoid conflicts.
// Fortunately, SwiftPM asks the compiler frontend to define the main entrypoint as
// `<module_name>_main` for testing executable targets (`-entry-point-function-name`)
// so object files of `executableTarget` targets are capable of being linked with
// libclang_rt.fuzzer.a.
// However, at link-time, SwiftPM asks the linker to rename the `<module_name>_main`
// symbol back to `main` for the final executable (`--defsym main=<module_name>_main`)
// and gold linker respects the renamed "main" symbol rather than the one defined in
// libclang_rt.fuzzer.a, so the final executable does not start the fuzzing process.
//
// Instead of relying on the SwiftPM's linking process, we build libraries defining
// fuzzing target functions and manually link them with fuzzing runtime libraries.
.library(name: "FuzzTranslator", type: .static, targets: ["FuzzTranslator"]),
.library(name: "FuzzExecute", type: .static, targets: ["FuzzExecute"]),
// FuzzDifferential is not a libFuzzer-based target, so we build it as an executable.
.executable(name: "FuzzDifferential", targets: ["FuzzDifferential"]),
],
dependencies: [
.package(path: "../"),
],
targets: [
.target(name: "FuzzTranslator", dependencies: [
"WasmKitFuzzing",
.product(name: "WasmKit", package: "WasmKit")
]),
.target(name: "FuzzExecute", dependencies: [
"WasmKitFuzzing",
.product(name: "WasmKit", package: "WasmKit"),
]),
.executableTarget(name: "FuzzDifferential", dependencies: [
.product(name: "WasmKit", package: "WasmKit"),
.product(name: "WAT", package: "WasmKit"),
"WasmCAPI",
]),
.target(name: "WasmCAPI"),
.target(name: "WasmKitFuzzing", dependencies: [
.product(name: "WasmKit", package: "WasmKit"),
])
]
)
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