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Add support for building Swift on Android targets #517

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Merged
merged 1 commit into from
May 21, 2025
Merged

Add support for building Swift on Android targets #517

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8 changes: 4 additions & 4 deletions Sources/SWBAndroidPlatform/AndroidSDK.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -57,10 +57,10 @@ struct AndroidSDK: Sendable {
}

struct LLVMTriple: Codable {
let arch: String
let vendor: String
let system: String
let environment: String
var arch: String
var vendor: String
var system: String
var environment: String

var description: String {
"\(arch)-\(vendor)-\(system)-\(environment)"
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33 changes: 32 additions & 1 deletion Sources/SWBAndroidPlatform/Plugin.swift
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Expand Up @@ -116,6 +116,37 @@ struct AndroidSDKRegistryExtension: SDKRegistryExtension {
return []
}

let allPossibleTriples = abis.values.flatMap { abi in
(max(deploymentTargetRange.min, abi.min_os_version)...deploymentTargetRange.max).map { deploymentTarget in
var triple = abi.llvm_triple
triple.vendor = "unknown" // Android NDK uses "none", Swift SDKs use "unknown"
triple.environment += "\(deploymentTarget)"
return triple
}
}.map(\.description)

let androidSwiftSDKs = (try? SwiftSDK.findSDKs(
targetTriples: allPossibleTriples,
fs: context.fs,
hostOperatingSystem: context.hostOperatingSystem
)) ?? []

let swiftSettings: [String: PropertyListItem]
// FIXME: We need a way to narrow down the list, possibly by passing down a Swift SDK identifier from SwiftPM
// The resource path should be the same for all triples in an Android Swift SDK
if let androidSwiftSDK = androidSwiftSDKs.only, let swiftResourceDir = Set(androidSwiftSDK.targetTriples.values.map { tripleProperties in androidSwiftSDK.path.join(tripleProperties.swiftResourcesPath) }).only {
swiftSettings = [
"SWIFT_LIBRARY_PATH": .plString(swiftResourceDir.join("android").str),
"SWIFT_RESOURCE_DIR": .plString(swiftResourceDir.str),
"SWIFT_TARGET_TRIPLE": .plString("$(CURRENT_ARCH)-unknown-$(SWIFT_PLATFORM_TARGET_PREFIX)$(LLVM_TARGET_TRIPLE_SUFFIX)"),
"LIBRARY_SEARCH_PATHS": "$(inherited) $(SWIFT_RESOURCE_DIR)/../$(__ANDROID_TRIPLE_$(CURRENT_ARCH))",
].merging(abis.map {
("__ANDROID_TRIPLE_\($0.value.llvm_triple.arch)", .plString($0.value.triple))
}, uniquingKeysWith: { _, new in new })
} else {
swiftSettings = [:]
}

return [(androidSdk.sysroot ?? .root, androidPlatform, [
"Type": .plString("SDK"),
"Version": .plString("0.0.0"),
Expand All @@ -129,7 +160,7 @@ struct AndroidSDKRegistryExtension: SDKRegistryExtension {
// FIXME: Make this configurable in a better way so we don't need to push build settings at the SDK definition level
"LLVM_TARGET_TRIPLE_OS_VERSION": .plString("linux"),
"LLVM_TARGET_TRIPLE_SUFFIX": .plString("-android$(ANDROID_DEPLOYMENT_TARGET)"),
]),
].merging(swiftSettings, uniquingKeysWith: { _, new in new })),
"SupportedTargets": .plDict([
"android": .plDict([
"Archs": .plArray(abis.map { .plString($0.value.llvm_triple.arch) }),
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