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Build: allow Darwin cross toolchains without typed allocation flags #242

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ebfeae3
build: allow cross toolchains without typed allocation flags
cristim Sep 23, 2026
4086eb1
Build: allow an external Swift source checkout
cristim Sep 23, 2026
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19 changes: 12 additions & 7 deletions Package.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -136,7 +136,10 @@ let isXcodeEnv = envStringValue("__CFBundleIdentifier", searchInDomain: false) =
let development = envBoolValue("DEVELOPMENT", default: false)
let warningsAsErrorsCondition = envBoolValue("WERROR", default: isXcodeEnv && development)

let swiftCheckoutPath = "\(Context.packageDirectory)/Checkouts/swift"
let swiftCheckoutPath = envStringValue(
"SWIFT_CHECKOUT_PATH",
default: "\(Context.packageDirectory)/Checkouts/swift"
)
let swiftCorelibsPath = envStringValue("LIB_SWIFT_PATH") ?? "\(Context.packageDirectory)/Sources/SwiftCorelibs/include"

let releaseVersion = envIntValue("TARGET_RELEASE", default: 2024)
Expand All @@ -148,23 +151,25 @@ let useLocalDeps = envBoolValue("USE_LOCAL_DEPS")
let danceUIGraphCondition = envBoolValue("OPENATTRIBUTESHIMS_DANCEUIGRAPH", default: false)
let computeCondition = envBoolValue("OPENATTRIBUTESHIMS_COMPUTE", default: false)
let attributeGraphCondition = envBoolValue("OPENATTRIBUTESHIMS_ATTRIBUTEGRAPH", default: false)
// Cross-compiling for Darwin can use a Clang without Apple's typed-allocation flags.
let typedMemoryOperations = envBoolValue("TYPED_MEMORY_OPERATIONS", default: true)

// MARK: - Shared Settings

var sharedCSettings: [CSetting] = [
.define("NDEBUG", .when(configuration: .release)),
// Rewrite malloc() to malloc_type_malloc() for type-isolated allocation buckets (xzone malloc).
.unsafeFlags(["-ftyped-memory-operations"], .when(platforms: .darwinPlatforms)),
]

var sharedCxxSettings: [CXXSetting] = [
.define("NDEBUG", .when(configuration: .release)),
// Rewrite malloc() to malloc_type_malloc() for type-isolated allocation buckets (xzone malloc).
.unsafeFlags(["-ftyped-memory-operations"], .when(platforms: .darwinPlatforms)),
// Rewrite operator new/delete to typed variants (operator new(size_t, std::__type_descriptor_t)).
.unsafeFlags(["-ftyped-cxx-new-delete"], .when(platforms: .darwinPlatforms)),
]

if typedMemoryOperations {
// Keep Apple's typed allocation behavior by default for native builds.
sharedCSettings.append(.unsafeFlags(["-ftyped-memory-operations"], .when(platforms: .darwinPlatforms)))
sharedCxxSettings.append(.unsafeFlags(["-ftyped-memory-operations", "-ftyped-cxx-new-delete"], .when(platforms: .darwinPlatforms)))
}

var sharedSwiftSettings: [SwiftSetting] = [
.enableUpcomingFeature("InternalImportsByDefault"),
.enableExperimentalFeature("Extern"),
Expand Down