[6.1][Android] Get this repo building again (#5151)

* [android] Fix package manifest and one Bionic function's API version

* Merge commit '246b3474fd4cb91d13b5ecb8fb5175aa6b50aa1e' into github/main

* Fix fts_open now that apinotes are applied

* Update Sources/Foundation/FileManager+POSIX.swift

* fix Port.swift conditional

* Ensure that the Android build on a windows host doesn't turn on WMO yet

The windows host builds with the old driver for now, so it doesn't yet support wmo

* [android] fix pthread flag inclusion in libxml2 package

* review fixes

* [android] Use Bionic imports instead where possible

---------

Co-authored-by: Alex Lorenz <arphaman@gmail.com>
Co-authored-by: Saleem Abdulrasool <compnerd@compnerd.org>

Author: 3 people

CMakeLists.txt

@@ -42,7 +42,7 @@ if(NOT SWIFT_SYSTEM_NAME)
 endif()
 
 # Don't enable WMO on Windows due to linker failures
-if(NOT CMAKE_SYSTEM_NAME STREQUAL Windows)
+if(NOT CMAKE_HOST_SYSTEM_NAME STREQUAL Windows)
     # Enable whole module optimization for release builds & incremental for debug builds
     if(POLICY CMP0157)
         set(CMAKE_Swift_COMPILATION_MODE "$<IF:$<CONFIG:Release>,wholemodule,incremental>")
@@ -150,6 +150,12 @@ if(NOT CMAKE_SYSTEM_NAME STREQUAL "WASI")
             "-I${DISPATCH_INCLUDE_PATH}/Block")
     endif()
 endif()
+if(ANDROID)
+  # LibXml2 looks for the Threads package, so
+  # ensure that it doesn't try to use the `-pthread`
+  # flag on Android.
+  set(CMAKE_HAVE_LIBC_PTHREAD YES)
+endif()
 find_package(LibXml2 REQUIRED)
 if(FOUNDATION_BUILD_NETWORKING)
     find_package(CURL REQUIRED)

Package.swift

@@ -26,7 +26,7 @@ if let environmentPath = Context.environment["DISPATCH_INCLUDE_PATH"] {
         .unsafeFlags([
             "-I/usr/lib/swift",
             "-I/usr/lib/swift/Block"
-        ], .when(platforms: [.linux, .android]))
+        ], .when(platforms: [.linux]))
     )
     if let sdkRoot = Context.environment["SDKROOT"] {
         dispatchIncludeFlags.append(.unsafeFlags([
@@ -245,7 +245,8 @@ let package = Package(
                 "BlockRuntime",
                 "CMakeLists.txt"
             ],
-            cSettings: coreFoundationBuildSettings
+            cSettings: coreFoundationBuildSettings,
+            linkerSettings: [.linkedLibrary("log", .when(platforms: [.android]))]
         ),
         .target(
             name: "BlocksRuntime",
@@ -262,7 +263,7 @@ let package = Package(
             name: "_CFXMLInterface",
             dependencies: [
                 "CoreFoundation",
-                .target(name: "Clibxml2", condition: .when(platforms: [.linux])),
+                .target(name: "Clibxml2", condition: .when(platforms: [.linux, .android])),
             ],
             path: "Sources/_CFXMLInterface",
             exclude: [
@@ -275,7 +276,7 @@ let package = Package(
             name: "_CFURLSessionInterface",
             dependencies: [
                 "CoreFoundation",
-                .target(name: "Clibcurl", condition: .when(platforms: [.linux])),
+                .target(name: "Clibcurl", condition: .when(platforms: [.linux, .android])),
             ],
             path: "Sources/_CFURLSessionInterface",
             exclude: [
@@ -348,7 +349,7 @@ let package = Package(
                 "FoundationNetworking",
                 "XCTest",
                 "Testing",
-                .target(name: "xdgTestHelper", condition: .when(platforms: [.linux]))
+                .target(name: "xdgTestHelper", condition: .when(platforms: [.linux, .android]))
             ],
             resources: [
                 .copy("Foundation/Resources")

Sources/CoreFoundation/CFPlatform.c

@@ -2283,7 +2283,7 @@ CF_EXPORT int _CFPosixSpawnFileActionsChdir(_CFPosixSpawnFileActionsRef file_act
   // Glibc versions prior to 2.29 don't support posix_spawn_file_actions_addchdir_np, impacting:
   //  - Amazon Linux 2 (EoL mid-2025)
   return ENOSYS;
-  #elif defined(__GLIBC__) || TARGET_OS_DARWIN || defined(__FreeBSD__) || defined(__ANDROID__) || defined(__musl__)
+  #elif defined(__GLIBC__) || TARGET_OS_DARWIN || defined(__FreeBSD__) || (defined(__ANDROID__) && __ANDROID_API__ >= 34) || defined(__musl__)
   // Pre-standard posix_spawn_file_actions_addchdir_np version available in:
   //  - Solaris 11.3 (October 2015)
   //  - Glibc 2.29 (February 2019)

Sources/CoreFoundation/include/ForSwiftFoundationOnly.h

@@ -69,6 +69,13 @@
 #include <sys/stat.h>
 #include <sys/syscall.h>
 #include <termios.h>
+#include <linux/fcntl.h>
+#ifdef __swift__
+// The linux/stat header is private in the Android modulemap.
+#pragma clang module import posix_filesystem.linux_stat
+#else
+#include <linux/stat.h>
+#endif
 #elif TARGET_OS_WASI
 #include <fcntl.h>
 #include <sys/stat.h>

Sources/CoreFoundation/internalInclude/CoreFoundation_Prefix.h

@@ -200,9 +200,9 @@ static dispatch_queue_t __ ## PREFIX ## Queue(void) {			\
 #endif
 
 // We know some things (Darwin, WASI, Glibc >= 2.38) have strlcpy/strlcat
-#if TARGET_OS_MAC || TARGET_OS_WASI                     \
-  || (defined(__GLIBC__) &&                             \
-      ((__GLIBC_MAJOR__ == 2 && __GLIBC_MINOR__ >= 38)  \
+#if TARGET_OS_MAC || TARGET_OS_WASI || TARGET_OS_ANDROID \
+  || (defined(__GLIBC__) &&                              \
+      ((__GLIBC_MAJOR__ == 2 && __GLIBC_MINOR__ >= 38)   \
        || __GLIBC_MAJOR__ > 2))
 #define HAVE_STRLCPY 1
 #define HAVE_STRLCAT 1

Sources/Foundation/CGFloat.swift

@@ -7,6 +7,10 @@
 // See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
 //
 
+#if canImport(Android)
+import Android
+#endif
+
 @frozen
 public struct CGFloat: Sendable {
 #if arch(i386) || arch(arm) || arch(wasm32)

Sources/Foundation/FileHandle.swift

@@ -34,6 +34,11 @@ import WASILibc
 fileprivate let _read = WASILibc.read(_:_:_:)
 fileprivate let _write = WASILibc.write(_:_:_:)
 fileprivate let _close = WASILibc.close(_:)
+#elseif canImport(Android)
+import Android
+fileprivate let _read = Android.read(_:_:_:)
+fileprivate let _write = Android.write(_:_:_:)
+fileprivate let _close = Android.close(_:)
 #endif
 
 #if canImport(WinSDK)
@@ -324,7 +329,7 @@ open class FileHandle : NSObject, @unchecked Sendable {
                 let data = mmap(nil, mapSize, PROT_READ, MAP_PRIVATE, _fd, 0)
                 // Swift does not currently expose MAP_FAILURE
                 if data != UnsafeMutableRawPointer(bitPattern: -1) {
-                    return NSData.NSDataReadResult(bytes: data!, length: mapSize) { buffer, length in
+                    return NSData.NSDataReadResult(bytes: data, length: mapSize) { buffer, length in
                         munmap(buffer, length)
                     }
                 }

Sources/Foundation/FileManager+POSIX.swift

@@ -7,6 +7,10 @@
 //
 #if !os(Windows)
 
+#if canImport(Android)
+import Android
+#endif
+
 #if os(Android) && (arch(i386) || arch(arm)) // struct stat.st_mode is UInt32
 internal func &(left: UInt32, right: mode_t) -> mode_t {
     return mode_t(left) & right
@@ -398,13 +402,13 @@ extension FileManager {
 
                 _current = fts_read(stream)
                 while let current = _current {
-                    let filename = FileManager.default.string(withFileSystemRepresentation: current.pointee.fts_path, length: Int(current.pointee.fts_pathlen))
+                    let filename = FileManager.default.string(withFileSystemRepresentation: current.pointee.fts_path!, length: Int(current.pointee.fts_pathlen))
 
                     switch Int32(current.pointee.fts_info) {
                         case FTS_D:
                             let (showFile, skipDescendants) = match(filename: filename, to: _options, isDir: true)
                             if skipDescendants {
-                                fts_set(_stream, _current, FTS_SKIP)
+                                fts_set(stream, current, FTS_SKIP)
                             }
                             if showFile {
                                  return URL(fileURLWithPath: filename, isDirectory: true)
@@ -578,7 +582,7 @@ extension FileManager {
             let finalErrno = originalItemURL.withUnsafeFileSystemRepresentation { (originalFS) -> Int32? in
                 return newItemURL.withUnsafeFileSystemRepresentation { (newItemFS) -> Int32? in
                     // This is an atomic operation in many OSes, but is not guaranteed to be atomic by the standard.
-                    if rename(newItemFS, originalFS) == 0 {
+                    if rename(newItemFS!, originalFS!) == 0 {
                         return nil
                     } else {
                         return errno

Sources/Foundation/FileManager.swift

@@ -21,6 +21,8 @@ import WinSDK
 
 #if os(WASI)
 import WASILibc
+#elseif canImport(Bionic)
+import Bionic
 #endif
 
 #if os(Windows)

Sources/Foundation/Host.swift

@@ -12,8 +12,9 @@
 import WinSDK
 #endif
 
-#if os(Android)
-    // Android Glibc differs a little with respect to the Linux Glibc.
+#if canImport(Android)
+    import Android
+    // Android Bionic differs a little with respect to the Linux Glibc.
 
     // IFF_LOOPBACK is part of the enumeration net_device_flags, which needs to
     // convert to UInt32.
@@ -24,8 +25,8 @@ import WinSDK
     }
 
     // getnameinfo uses size_t for its 4th and 6th arguments.
-    private func getnameinfo(_ addr: UnsafePointer<sockaddr>?, _ addrlen: socklen_t, _ host: UnsafeMutablePointer<Int8>?, _ hostlen: socklen_t, _ serv: UnsafeMutablePointer<Int8>?, _ servlen: socklen_t, _ flags: Int32) -> Int32 {
-        return Glibc.getnameinfo(addr, addrlen, host, Int(hostlen), serv, Int(servlen), flags)
+    private func getnameinfo(_ addr: UnsafePointer<sockaddr>, _ addrlen: socklen_t, _ host: UnsafeMutablePointer<Int8>?, _ hostlen: socklen_t, _ serv: UnsafeMutablePointer<Int8>?, _ servlen: socklen_t, _ flags: Int32) -> Int32 {
+        return Android.getnameinfo(addr, addrlen, host, Int(hostlen), serv, Int(servlen), flags)
     }
 
     // getifaddrs and freeifaddrs are not available in Android 6.0 or earlier, so call these functions dynamically.