mac: drop build support for swift versions earlier than version 4.1

this drops support for swift <4.1 and with this support for xcode <=9.2.
this was the last setup that is officially working on macOS 10.12.

our old legacy build macOS 10.12 + xcode 9.2 is replaced by macOS 10.13
+ xcode 9.4.1 with swift 4.1. the macOS 10.13 + xcode 10.1 VM is
replaced by the latest macOS 10.14 + xcode 11.3.1 VM. this is the oldest
version officially supported by Apple.

this is in preparations for the following commit.

.travis.yml

@@ -36,18 +36,13 @@ matrix:
     - <<: *mac
       osx_image: xcode12.2
     - <<: *mac
-      osx_image: xcode10.1
+      osx_image: xcode11.3
+    - <<: *mac
+      osx_image: xcode9.4
       env:
         - HOMEBREW_NO_AUTO_UPDATE=1
         - HOMEBREW_NO_INSTALL_CLEANUP=1
         - CI_HOMEBREW_HASH=7242872d7878f1a4c2706e5837faafcf0782b58d
-    - <<: *mac
-      osx_image: xcode9.2
-      env:
-        - HOMEBREW_NO_AUTO_UPDATE=1
-        - HOMEBREW_NO_INSTALL_CLEANUP=1
-        - CI_SWIFT_FLAGS="\-target x86_64-apple-macosx10.12"
-        - CI_HOMEBREW_HASH=55e02323812604add9a69bab8730319b9255a697
     - os: freebsd
       compiler: clang
     - os: linux
@@ -62,7 +57,7 @@ matrix:
       env: CI_SCRIPT=ci/build-mingw64.sh TARGET=x86_64-w64-mingw32
   allow_failures:
     - os: osx
-      osx_image: xcode9.2
+      osx_image: xcode9.4
   fast_finish: true
 
 dist: focal
@@ -123,15 +118,14 @@ before_install:
         fi
   - |
         if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then
-            remove=$(brew list)
+            remove=$(brew list --formula)
             keep="gettext pcre2 git"
             install="autoconf automake pkg-config libtool python freetype fribidi little-cms2 luajit libass ffmpeg"
             for formula in ${keep[@]}; do remove=("${remove[@]/$formula}"); done
             for formula in ${install[@]}; do remove=("${remove[@]/$formula}"); done
             brew remove --force $remove --ignore-dependencies
-            if [[ "$TRAVIS_OSX_IMAGE" == "xcode9.2" ]]; then
-                brew untap caskroom/cask
-            fi
+            brew remove --cask $(brew list --cask)
+            brew untap homebrew/cask
             brew update
             if [[ -n "$CI_HOMEBREW_HASH" ]]; then
                 pushd "/usr/local/Homebrew/Library/Taps/homebrew/homebrew-core"

osdep/macos/swift_compat.swift

@@ -33,7 +33,6 @@ extension String {
 #endif
 
 extension NSPasteboard.PasteboardType {
-
     static let fileURLCompat: NSPasteboard.PasteboardType = {
         if #available(OSX 10.13, *) {
             return .fileURL
@@ -53,7 +52,6 @@ extension NSPasteboard.PasteboardType {
 
 #if !swift(>=5.0)
 extension Data {
-
     mutating func withUnsafeMutableBytes<Type>(_ body: (UnsafeMutableRawBufferPointer) throws -> Type) rethrows -> Type {
         let dataCount = count
         return try withUnsafeMutableBytes { (ptr: UnsafeMutablePointer<UInt8>) throws -> Type in
@@ -65,33 +63,8 @@ extension Data {
 
 #if !swift(>=4.2)
 extension NSDraggingInfo {
-
     var draggingPasteboard: NSPasteboard {
         get { return draggingPasteboard() }
     }
 }
 #endif
-
-#if !swift(>=4.1)
-extension Array {
-
-    func compactMap<ElementOfResult>(_ transform: (Element) throws -> ElementOfResult?) rethrows -> [ElementOfResult] {
-        return try self.flatMap(transform)
-    }
-}
-
-extension Array where Element == [CGLPixelFormatAttribute] {
-
-    func contains(_ obj: [CGLPixelFormatAttribute]) -> Bool {
-        return self.contains(where:{ $0 == obj })
-    }
-}
-
-extension NSWindow.Level {
-
-    static func +(left: NSWindow.Level, right: Int) -> NSWindow.Level {
-        return NSWindow.Level(left.rawValue + right)
-    }
-}
-#endif
-

waftools/checks/custom.py

@@ -114,17 +114,19 @@ def check_cocoa(ctx, dependency_identifier):
 
     return res
 
-def check_swift(ctx, dependency_identifier):
-    minVer = StrictVersion("3.0.2")
-    if ctx.env.SWIFT_VERSION:
-        if StrictVersion(ctx.env.SWIFT_VERSION) >= minVer:
-            ctx.add_optional_message(dependency_identifier,
-                                     'version found: ' + str(ctx.env.SWIFT_VERSION))
-            return True
-    ctx.add_optional_message(dependency_identifier,
-                             "'swift >= " + str(minVer) + "' not found, found " +
-                             str(ctx.env.SWIFT_VERSION or None))
-    return False
+def check_swift(version):
+    def fn(ctx, dependency_identifier):
+        minVer = StrictVersion(version)
+        if ctx.env.SWIFT_VERSION:
+            if StrictVersion(ctx.env.SWIFT_VERSION) >= minVer:
+                ctx.add_optional_message(dependency_identifier,
+                                         'version found: ' + str(ctx.env.SWIFT_VERSION))
+                return True
+        ctx.add_optional_message(dependency_identifier,
+                                 "'swift >= " + str(minVer) + "' not found, found " +
+                                 str(ctx.env.SWIFT_VERSION or None))
+        return False
+    return fn
 
 def check_egl_provider(minVersion=None, name='egl', check=None):
     def fn(ctx, dependency_identifier, **kw):

wscript

@@ -182,7 +182,7 @@ main_dependencies = [
         'name': '--swift',
         'desc': 'macOS Swift build tools',
         'deps': 'os-darwin',
-        'func': compose_checks(check_swift, check_macos_sdk('10.10')),
+        'func': compose_checks(check_swift('4.1'), check_macos_sdk('10.10')),
     }, {
         'name': '--uwp',
         'desc': 'Universal Windows Platform',