termux-packages/disabled-packages/swift/swiftpm-android.patch

diff --git a/swiftpm/Sources/Basic/Process.swift b/swiftpm/Sources/Basic/Process.swift
index f388c769..573e2e3c 100644
--- a/swiftpm/Sources/Basic/Process.swift
+++ b/swiftpm/Sources/Basic/Process.swift
@@ -268,7 +268,7 @@ public final class Process: ObjectIdentifierProtocol {
         }
 
         // Initialize the spawn attributes.
-      #if canImport(Darwin)
+      #if canImport(Darwin) || os(Android)
         var attributes: posix_spawnattr_t? = nil
       #else
         var attributes = posix_spawnattr_t()
@@ -313,7 +313,7 @@ public final class Process: ObjectIdentifierProtocol {
         posix_spawnattr_setflags(&attributes, Int16(flags))
 
         // Setup the file actions.
-      #if canImport(Darwin)
+      #if canImport(Darwin) || os(Android)
         var fileActions: posix_spawn_file_actions_t? = nil
       #else
         var fileActions = posix_spawn_file_actions_t()
diff --git a/swiftpm/Sources/Build/BuildPlan.swift b/swiftpm/Sources/Build/BuildPlan.swift
index 8ad4bdf9..29c8e9b9 100644
--- a/swiftpm/Sources/Build/BuildPlan.swift
+++ b/swiftpm/Sources/Build/BuildPlan.swift
@@ -214,6 +214,8 @@ public struct BuildParameters {
     var currentPlatform: PackageModel.Platform {
         if self.triple.isDarwin() {
             return .macOS
+        } else if self.triple.isAndroid() {
+            return .android
         } else {
             return .linux
         }
diff --git a/swiftpm/Sources/Build/Triple.swift b/swiftpm/Sources/Build/Triple.swift
index 1a0e3095..54bc179e 100644
--- a/swiftpm/Sources/Build/Triple.swift
+++ b/swiftpm/Sources/Build/Triple.swift
@@ -61,7 +61,7 @@ public struct Triple {
 
     public enum ABI: String {
         case unknown
-        case android = "androideabi"
+        case android
     }
 
     public init(_ string: String) throws {
@@ -81,8 +81,7 @@ public struct Triple {
             throw Error.unknownOS
         }
 
-        let abiString = components.count > 3 ? components[3] : nil
-        let abi = abiString.flatMap(ABI.init)
+        let abi = components.count > 3 ? Triple.parseABI(components[3]) : nil
 
         self.tripleString = string
         self.arch = arch
@@ -101,6 +100,17 @@ public struct Triple {
         return nil
     }
 
+    fileprivate static func parseABI(_ string: String) -> ABI? {
+        if string.hasPrefix(ABI.android.rawValue) {
+            return ABI.android
+        }
+        return nil
+    }
+
+    public func isAndroid() -> Bool {
+        return os == .linux && abi == .android
+    }
+
     public func isDarwin() -> Bool {
         return vendor == .apple || os == .macOS || os == .darwin
     }
@@ -128,7 +132,10 @@ public struct Triple {
     public static let s390xLinux = try! Triple("s390x-unknown-linux")
     public static let arm64Linux = try! Triple("aarch64-unknown-linux")
     public static let armLinux = try! Triple("armv7-unknown-linux-gnueabihf")
-    public static let android = try! Triple("armv7-unknown-linux-androideabi")
+    public static let armAndroid = try! Triple("armv7a-unknown-linux-androideabi")
+    public static let arm64Android = try! Triple("aarch64-unknown-linux-android")
+    public static let x86_64Android = try! Triple("x86_64-unknown-linux-android")
+    public static let i686Android = try! Triple("i686-unknown-linux-android")
     public static let windows = try! Triple("x86_64-unknown-windows-msvc")
 
   #if os(macOS)
@@ -149,6 +156,16 @@ public struct Triple {
     #elseif arch(arm)
       public static let hostTriple: Triple = .armLinux    
     #endif
+  #elseif os(Android)
+    #if arch(arm)
+      public static let hostTriple: Triple = .armAndroid
+    #elseif arch(arm64)
+      public static let hostTriple: Triple = .arm64Android
+    #elseif arch(x86_64)
+      public static let hostTriple: Triple = .x86_64Android
+    #elseif arch(i386)
+      public static let hostTriple: Triple = .i686Android
+    #endif
   #endif
 }
 
diff --git a/swiftpm/Sources/Commands/SwiftTool.swift b/swiftpm/Sources/Commands/SwiftTool.swift
index 69865506..16374704 100644
--- a/swiftpm/Sources/Commands/SwiftTool.swift
+++ b/swiftpm/Sources/Commands/SwiftTool.swift
@@ -402,6 +402,12 @@ public class SwiftTool<Options: ToolOptions> {
                 action.__sigaction_u.__sa_handler = SIG_DFL
                 sigaction(SIGINT, &action, nil)
                 kill(getpid(), SIGINT)
+              #elseif os(Android)
+                // Install the default signal handler.
+                var action = sigaction()
+                action.sa_handler = SIG_DFL
+                sigaction(SIGINT, &action, nil)
+                kill(getpid(), SIGINT)
               #else
                 var action = sigaction()
                 action.__sigaction_handler = unsafeBitCast(
diff --git a/swiftpm/Sources/PackageDescription4/Package.swift b/swiftpm/Sources/PackageDescription4/Package.swift
index 51463e92..ce29b49c 100644
--- a/swiftpm/Sources/PackageDescription4/Package.swift
+++ b/swiftpm/Sources/PackageDescription4/Package.swift
@@ -8,7 +8,7 @@
  See http://swift.org/CONTRIBUTORS.txt for Swift project authors
 */
 
-#if os(Linux)
+#if canImport(Glibc)
 import Glibc
 #elseif os(iOS) || os(macOS) || os(tvOS) || os(watchOS)
 import Darwin.C
diff --git a/swiftpm/Sources/PackageDescription4/SupportedPlatforms.swift b/swiftpm/Sources/PackageDescription4/SupportedPlatforms.swift
index 9e8398dd..34c62c62 100644
--- a/swiftpm/Sources/PackageDescription4/SupportedPlatforms.swift
+++ b/swiftpm/Sources/PackageDescription4/SupportedPlatforms.swift
@@ -25,6 +25,7 @@ public struct Platform: Encodable {
     public static let tvOS: Platform = Platform(name: "tvos")
     public static let watchOS: Platform = Platform(name: "watchos")
     public static let linux: Platform = Platform(name: "linux")
+    public static let android: Platform = Platform(name: "android")
 }
 
 /// A platform that the Swift package supports.
diff --git a/swiftpm/Sources/PackageLoading/ManifestLoader.swift b/swiftpm/Sources/PackageLoading/ManifestLoader.swift
index 824db1cb..079560a8 100644
--- a/swiftpm/Sources/PackageLoading/ManifestLoader.swift
+++ b/swiftpm/Sources/PackageLoading/ManifestLoader.swift
@@ -479,7 +479,7 @@ public final class ManifestLoader: ManifestLoaderProtocol {
 
     /// Returns the extra manifest args required during SwiftPM's own bootstrap.
     private func bootstrapArgs() -> [String] {
-      #if !os(Linux)
+      #if !os(Linux) && !os(Android)
         return []
       #else
         // The Linux bots require extra arguments in order to locate the corelibs.
@@ -494,8 +494,8 @@ public final class ManifestLoader: ManifestLoaderProtocol {
         }
 
         // Construct the required search paths relative to the build directory.
-        let libdir = buildPath.appending(RelativePath(".bootstrap/lib/swift/linux"))
-        let incdir = libdir.appending(component: "x86_64")
+        let libdir = buildPath.appending(RelativePath(".bootstrap/lib/swift/android"))
+        let incdir = libdir.appending(component: "aarch64")
         let dispatchIncdir = incdir.appending(component: "dispatch")
 
         return [
diff --git a/swiftpm/Sources/PackageModel/Platform.swift b/swiftpm/Sources/PackageModel/Platform.swift
index 3f56355a..66d14321 100644
--- a/swiftpm/Sources/PackageModel/Platform.swift
+++ b/swiftpm/Sources/PackageModel/Platform.swift
@@ -29,7 +29,7 @@ public final class PlatformRegistry {
 
     /// The static list of known platforms.
     private static var _knownPlatforms: [Platform] {
-        return [.macOS, .iOS, .tvOS, .watchOS, .linux]
+        return [.macOS, .iOS, .tvOS, .watchOS, .linux, .android]
     }
 }
 
@@ -55,6 +55,7 @@ public struct Platform: Equatable, Hashable {
     public static let tvOS: Platform = Platform(name: "tvos", oldestSupportedVersion: "9.0")
     public static let watchOS: Platform = Platform(name: "watchos", oldestSupportedVersion: "2.0")
     public static let linux: Platform = Platform(name: "linux", oldestSupportedVersion: .unknown)
+    public static let android: Platform = Platform(name: "android", oldestSupportedVersion: .unknown)
 }
 
 /// Represents a platform version.
diff --git a/swiftpm/Sources/SPMLibc/libc.swift b/swiftpm/Sources/SPMLibc/libc.swift
index 4f32b5a4..e346b728 100644
--- a/swiftpm/Sources/SPMLibc/libc.swift
+++ b/swiftpm/Sources/SPMLibc/libc.swift
@@ -8,7 +8,7 @@
  See http://swift.org/CONTRIBUTORS.txt for Swift project authors
 */
 
-#if os(Linux)
+#if canImport(Glibc)
 @_exported import Glibc
 #else
 @_exported import Darwin.C
diff --git a/swiftpm/Sources/SPMUtility/FSWatch.swift b/swiftpm/Sources/SPMUtility/FSWatch.swift
index 70b12765..98b95cc0 100644
--- a/swiftpm/Sources/SPMUtility/FSWatch.swift
+++ b/swiftpm/Sources/SPMUtility/FSWatch.swift
@@ -428,55 +428,76 @@ public final class Inotify {
 // FIXME: <rdar://problem/45794219> Swift should provide shims for FD_ macros
 
 private func FD_ZERO(_ set: inout fd_set) {
+      #if os(Android)
+	set.fds_bits = (0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0)
+      #else
 	set.__fds_bits = (0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0)
+      #endif
 }
 
 private func FD_SET(_ fd: Int32, _ set: inout fd_set) {
     let intOffset = Int(fd / 16)
     let bitOffset = Int(fd % 16)
+  #if os(Android)
+    var fd_bits = set.fds_bits
+    let mask: UInt = 1 << bitOffset
+  #else
+    var fd_bits = set.__fds_bits
     let mask = 1 << bitOffset
+  #endif
     switch intOffset {
-        case 0: set.__fds_bits.0 = set.__fds_bits.0 | mask
-        case 1: set.__fds_bits.1 = set.__fds_bits.1 | mask
-        case 2: set.__fds_bits.2 = set.__fds_bits.2 | mask
-        case 3: set.__fds_bits.3 = set.__fds_bits.3 | mask
-        case 4: set.__fds_bits.4 = set.__fds_bits.4 | mask
-        case 5: set.__fds_bits.5 = set.__fds_bits.5 | mask
-        case 6: set.__fds_bits.6 = set.__fds_bits.6 | mask
-        case 7: set.__fds_bits.7 = set.__fds_bits.7 | mask
-        case 8: set.__fds_bits.8 = set.__fds_bits.8 | mask
-        case 9: set.__fds_bits.9 = set.__fds_bits.9 | mask
-        case 10: set.__fds_bits.10 = set.__fds_bits.10 | mask
-        case 11: set.__fds_bits.11 = set.__fds_bits.11 | mask
-        case 12: set.__fds_bits.12 = set.__fds_bits.12 | mask
-        case 13: set.__fds_bits.13 = set.__fds_bits.13 | mask
-        case 14: set.__fds_bits.14 = set.__fds_bits.14 | mask
-        case 15: set.__fds_bits.15 = set.__fds_bits.15 | mask
+        case 0: fd_bits.0 = fd_bits.0 | mask
+        case 1: fd_bits.1 = fd_bits.1 | mask
+        case 2: fd_bits.2 = fd_bits.2 | mask
+        case 3: fd_bits.3 = fd_bits.3 | mask
+        case 4: fd_bits.4 = fd_bits.4 | mask
+        case 5: fd_bits.5 = fd_bits.5 | mask
+        case 6: fd_bits.6 = fd_bits.6 | mask
+        case 7: fd_bits.7 = fd_bits.7 | mask
+        case 8: fd_bits.8 = fd_bits.8 | mask
+        case 9: fd_bits.9 = fd_bits.9 | mask
+        case 10: fd_bits.10 = fd_bits.10 | mask
+        case 11: fd_bits.11 = fd_bits.11 | mask
+        case 12: fd_bits.12 = fd_bits.12 | mask
+        case 13: fd_bits.13 = fd_bits.13 | mask
+        case 14: fd_bits.14 = fd_bits.14 | mask
+        case 15: fd_bits.15 = fd_bits.15 | mask
         default: break
     }
+  #if os(Android)
+    set.fds_bits = fd_bits
+  #else
+    set.__fds_bits = fd_bits
+  #endif
 }
 
 private func FD_ISSET(_ fd: Int32, _ set: inout fd_set) -> Bool {
     let intOffset = Int(fd / 32)
     let bitOffset = Int(fd % 32)
+  #if os(Android)
+    let fd_bits = set.fds_bits
+    let mask: UInt = 1 << bitOffset
+  #else
+    let fd_bits = set.__fds_bits
     let mask = 1 << bitOffset
+  #endif
     switch intOffset {
-        case 0: return set.__fds_bits.0 & mask != 0
-        case 1: return set.__fds_bits.1 & mask != 0
-        case 2: return set.__fds_bits.2 & mask != 0
-        case 3: return set.__fds_bits.3 & mask != 0
-        case 4: return set.__fds_bits.4 & mask != 0
-        case 5: return set.__fds_bits.5 & mask != 0
-        case 6: return set.__fds_bits.6 & mask != 0
-        case 7: return set.__fds_bits.7 & mask != 0
-        case 8: return set.__fds_bits.8 & mask != 0
-        case 9: return set.__fds_bits.9 & mask != 0
-        case 10: return set.__fds_bits.10 & mask != 0
-        case 11: return set.__fds_bits.11 & mask != 0
-        case 12: return set.__fds_bits.12 & mask != 0
-        case 13: return set.__fds_bits.13 & mask != 0
-        case 14: return set.__fds_bits.14 & mask != 0
-        case 15: return set.__fds_bits.15 & mask != 0
+        case 0: return fd_bits.0 & mask != 0
+        case 1: return fd_bits.1 & mask != 0
+        case 2: return fd_bits.2 & mask != 0
+        case 3: return fd_bits.3 & mask != 0
+        case 4: return fd_bits.4 & mask != 0
+        case 5: return fd_bits.5 & mask != 0
+        case 6: return fd_bits.6 & mask != 0
+        case 7: return fd_bits.7 & mask != 0
+        case 8: return fd_bits.8 & mask != 0
+        case 9: return fd_bits.9 & mask != 0
+        case 10: return fd_bits.10 & mask != 0
+        case 11: return fd_bits.11 & mask != 0
+        case 12: return fd_bits.12 & mask != 0
+        case 13: return fd_bits.13 & mask != 0
+        case 14: return fd_bits.14 & mask != 0
+        case 15: return fd_bits.15 & mask != 0
         default: return false
     }
 }
diff --git a/swiftpm/Sources/SPMUtility/IndexStore.swift b/swiftpm/Sources/SPMUtility/IndexStore.swift
index 99814fba..ad99f692 100644
--- a/swiftpm/Sources/SPMUtility/IndexStore.swift
+++ b/swiftpm/Sources/SPMUtility/IndexStore.swift
@@ -191,7 +191,11 @@ public final class IndexStoreAPI {
 
     public init(dylib path: AbsolutePath) throws {
         self.path = path
+      #if os(Android)
+        self.dylib = try dlopen(path.pathString, mode: [.lazy, .local, .first])
+      #else
         self.dylib = try dlopen(path.pathString, mode: [.lazy, .local, .first, .deepBind])
+      #endif
 
         func dlsym_required<T>(_ handle: DLHandle, symbol: String) throws -> T {
             guard let sym: T = dlsym(handle, symbol: symbol) else {
diff --git a/swiftpm/Sources/SPMUtility/InterruptHandler.swift b/swiftpm/Sources/SPMUtility/InterruptHandler.swift
index 3eb32a29..2d477d78 100644
--- a/swiftpm/Sources/SPMUtility/InterruptHandler.swift
+++ b/swiftpm/Sources/SPMUtility/InterruptHandler.swift
@@ -39,6 +39,8 @@ public final class InterruptHandler {
         var action = sigaction()
       #if canImport(Darwin)
         action.__sigaction_u.__sa_handler = signalHandler
+      #elseif os(Android)
+        action.sa_handler = signalHandler
       #else
         action.__sigaction_handler = unsafeBitCast(
             signalHandler,
diff --git a/swiftpm/Sources/SPMUtility/Platform.swift b/swiftpm/Sources/SPMUtility/Platform.swift
index 29db029b..15907ff6 100644
--- a/swiftpm/Sources/SPMUtility/Platform.swift
+++ b/swiftpm/Sources/SPMUtility/Platform.swift
@@ -13,6 +13,7 @@ import Foundation
 
 /// Recognized Platform types.
 public enum Platform {
+    case android
     case darwin
     case linux(LinuxFlavor)
     
@@ -33,6 +34,10 @@ public enum Platform {
             if localFileSystem.isFile(AbsolutePath("/etc/debian_version")) {
                 return .linux(.debian)
             }
+            if localFileSystem.isFile(AbsolutePath("/system/bin/toolbox")) ||
+               localFileSystem.isFile(AbsolutePath("/system/bin/toybox")) {
+                return .android
+            }
         default:
             return nil
         }
@@ -60,6 +65,7 @@ public enum Platform {
     /// Returns the value of given path variable using `getconf` utility.
     ///
     /// - Note: This method returns `nil` if the value is an invalid path.
+  #if os(macOS)
     private static func getConfstr(_ name: Int32) -> AbsolutePath? {
         let len = confstr(name, nil, 0)
         let tmp = UnsafeMutableBufferPointer(start: UnsafeMutablePointer<Int8>.allocate(capacity: len), count:len)
@@ -69,4 +75,5 @@ public enum Platform {
         guard value.hasSuffix(AbsolutePath.root.pathString) else { return nil }
         return resolveSymlinks(AbsolutePath(value))
     }
+  #endif
 }
diff --git a/swiftpm/Sources/SPMUtility/dlopen.swift b/swiftpm/Sources/SPMUtility/dlopen.swift
index a36b0052..f73da65d 100644
--- a/swiftpm/Sources/SPMUtility/dlopen.swift
+++ b/swiftpm/Sources/SPMUtility/dlopen.swift
@@ -60,8 +60,10 @@ public struct DLOpenFlags: RawRepresentable, OptionSet {
     public static let deepBind: DLOpenFlags = DLOpenFlags(rawValue: 0)
   #else
     public static let first: DLOpenFlags = DLOpenFlags(rawValue: 0)
+  #if !os(Android)
     public static let deepBind: DLOpenFlags = DLOpenFlags(rawValue: RTLD_DEEPBIND)
   #endif
+  #endif
   #endif
 
     public var rawValue: Int32
diff --git a/swiftpm/Sources/PackageLoading/Target+PkgConfig.swift b/swiftpm/Sources/PackageLoading/Target+PkgConfig.swift
index c0918cc6..aaabfa89 100644
--- a/swiftpm/Sources/PackageLoading/Target+PkgConfig.swift
+++ b/swiftpm/Sources/PackageLoading/Target+PkgConfig.swift
@@ -118,6 +118,9 @@ extension SystemPackageProviderDescription {
             if case .linux(.debian) = platform {
                 return true
             }
+            if case .android = platform {
+                return true
+            }
         }
         return false
     }
diff --git a/swiftpm/Utilities/bootstrap b/swiftpm/Utilities/bootstrap
index b6343c3f..92be12c6 100755
--- a/swiftpm/Utilities/bootstrap
+++ b/swiftpm/Utilities/bootstrap
@@ -273,6 +273,10 @@ class Target(object):
         if args.llbuild_link_framework:
             other_args.extend(["-F", args.llbuild_build_dir])
 
+        # Don't use GNU strerror_r on Android.
+        if 'ANDROID_DATA' in os.environ:
+            other_args.extend(["-Xcc", "-U_GNU_SOURCE"])
+
         print("    import-paths: %s" % json.dumps(import_paths), file=output)
         print("    other-args: %s" % json.dumps(other_args),
               file=output)
@@ -571,7 +575,7 @@ class llbuild(object):
                     link_command.extend(["-Xlinker", "-l%s" % (lib,)])
                 if platform.system() == 'Linux':
                     link_command.extend(
-                        ["-Xlinker", "-rpath=$ORIGIN/../lib/swift/linux"])
+                        ["-Xlinker", "-rpath=$ORIGIN/../lib/swift/android", "-Xlinker", "-landroid-spawn"])
                 if self.args.foundation_path:
                     link_command.extend(["-L", self.args.foundation_path])
                 if self.args.libdispatch_build_dir:
@@ -675,8 +679,9 @@ def process_runtime_libraries(build, args, lib_path):
         cmd = [args.swiftc_path, "-emit-library", "-o", runtime_lib_path,
                "-Xlinker", "--whole-archive",
                "-Xlinker", input_lib_path,
-               "-Xlinker", "--no-whole-archive", "-lswiftGlibc",
-               "-Xlinker", "-rpath=$ORIGIN/../../linux"]
+               "-Xlinker", "--no-whole-archive", "-Xlinker", "-L%s" % args.foundation_path,
+               "-lswiftGlibc", "-lFoundation",
+               "-Xlinker", "-rpath=$ORIGIN/../../android"]
 
         # We need to pass one swift file here to bypass the "no input files"
         # error.
@@ -737,8 +742,8 @@
 def get_clang_path():
     try:
         if os.getenv("CC"):
-            clang_path=os.path.realpath(os.getenv("CC"))
-            return clang_path
+            return subprocess.check_output(["which", os.getenv("CC")],
+            universal_newlines=True).strip()
         elif platform.system() == 'Darwin':
             return subprocess.check_output(["xcrun", "--find", "clang"],
                 stderr=subprocess.PIPE, universal_newlines=True).strip()
@@ -1030,7 +1035,14 @@ def main():
     if platform.system() == 'Darwin':
         build_target = "x86_64-apple-macosx"
     elif platform.system() == 'Linux':              
-        if platform.machine() == 'x86_64':
+        if 'ANDROID_DATA' in os.environ:
+            if platform.machine().startswith("armv7"):
+                build_target = 'armv7-unknown-linux-androideabi'
+            elif platform.machine() == 'aarch64':
+                build_target = 'aarch64-unknown-linux-android'
+            else:
+                raise SystemExit("ERROR: unsupported Android platform:",platform.machine())
+        elif platform.machine() == 'x86_64':
             build_target = "x86_64-unknown-linux"
         elif platform.machine() == "i686":
             build_target = "i686-unknown-linux"
@@ -1159,8 +1172,8 @@ def main():
         symlink_force(os.path.join(sandbox_path, "lib"), usrdir)
 
         if args.foundation_path and args.libdispatch_build_dir and args.xctest_path:
-            libswiftdir = os.path.join(sandbox_path, "lib", "swift", "linux")
-            libincludedir = os.path.join(libswiftdir, "x86_64")
+            libswiftdir = os.path.join(sandbox_path, "lib", "swift", "android")
+            libincludedir = os.path.join(libswiftdir, "aarch64")
             mkdir_p(libswiftdir)
             mkdir_p(libincludedir)
 
@@ -1210,10 +1223,10 @@ def main():
         embed_rpath = args.stdlib_rpath
     else:
         if platform.system() == 'Linux':
-            embed_rpath = "$ORIGIN/../lib/swift/linux"
+            embed_rpath = "$ORIGIN/../lib/swift/android"
         else:
             embed_rpath = "@executable_path/../lib/swift/macosx"
-    build_flags.extend(["-Xlinker", "-rpath", "-Xlinker", embed_rpath])
+    build_flags.extend(["-Xlinker", "-rpath", "-Xlinker", embed_rpath, "-Xlinker", "-landroid-spawn"])
     if args.verbose:
         build_flags.append("-v")
 
@@ -1236,6 +1248,10 @@ def main():
         # Add an RPATH, so that the tests can be run directly.
         build_flags.extend(["-Xlinker", "-rpath", "-Xlinker", faketoolchain_libdir])
 
+    # Don't use GNU strerror_r on Android.
+    if 'ANDROID_DATA' in os.environ:
+        build_flags.extend(["-Xswiftc", "-Xcc", "-Xswiftc", "-U_GNU_SOURCE"])
+
     # Add llbuild import flags.
     for import_path in llbuild_import_paths(args):
         build_flags.extend(["-Xswiftc", "-I%s" % import_path])