ref: prevent implicit UIKit linkage

.github/workflows/build.yml

@@ -166,3 +166,23 @@ jobs:
       - uses: actions/checkout@v4
       - run: swift build
         shell: sh
+
+  check-uikit-linkage-debug:
+    name: Check UIKit linkage (Debug)
+    runs-on: macos-13
+    steps:
+      - uses: actions/checkout@v4
+      - name: Build for Debug
+        run: ./scripts/xcode-test.sh "iOS" "latest" $GITHUB_REF_NAME ci build "iPhone 14" Debug_without_UIKit uikit-check-build
+      - name: Ensure no UIKit
+        run: ./scripts/check-uikit-linkage.sh Debug_without_UIKit uikit-check-build
+
+  check-uikit-linkage-release:
+    name: Check UIKit linkage (Release)
+    runs-on: macos-13
+    steps:
+      - uses: actions/checkout@v4
+      - name: Build for Release
+        run: ./scripts/xcode-test.sh "iOS" "latest" $GITHUB_REF_NAME ci build "iPhone 14" Release_without_UIKit uikit-check-build
+      - name: Ensure no UIKit
+        run: ./scripts/check-uikit-linkage.sh Release_without_UIKit uikit-check-build

.github/workflows/test.yml

@@ -182,14 +182,14 @@ jobs:
       # We split building and running tests in two steps so we know how long running the tests takes.
       - name: Build tests
         id: build_tests
-        run: ./scripts/xcode-test.sh ${{matrix.platform}} ${{matrix.test-destination-os}} $GITHUB_REF_NAME ci build-for-testing "${{matrix.device}}"
+        run: ./scripts/xcode-test.sh ${{matrix.platform}} ${{matrix.test-destination-os}} $GITHUB_REF_NAME ci build-for-testing "${{matrix.device}}" TestCI
 
       - name: Run tests
         # We call a script with the platform so the destination
         # passed to xcodebuild doesn't end up in the job name,
         # because GitHub Actions don't provide an easy way of
         # manipulating string in expressions.
-        run: ./scripts/xcode-test.sh ${{matrix.platform}} ${{matrix.test-destination-os}} $GITHUB_REF_NAME ci test-without-building "${{matrix.device}}"
+        run: ./scripts/xcode-test.sh ${{matrix.platform}} ${{matrix.test-destination-os}} $GITHUB_REF_NAME ci test-without-building "${{matrix.device}}" TestCI
 
       - name: Slowest Tests
         if: ${{ always() }}

CHANGELOG.md

@@ -4,6 +4,7 @@
 
 ### Features
 
+- Sentry can now be used without linking UIKit; this is helpful for using the SDK in certain app extension contexts (#3175)
 - GA of MetricKit integration (#3340)
 
 Once enabled, this feature subscribes to [MetricKit's](https://developer.apple.com/documentation/metrickit) [MXDiagnosticPayload](https://developer.apple.com/documentation/metrickit/mxdiagnosticpayload) data, converts it to events, and sends it to Sentry.

Makefile

@@ -44,7 +44,7 @@ GIT-REF := $(shell git rev-parse --abbrev-ref HEAD)
 
 test:
 	@echo "--> Running all tests"
-	./scripts/xcode-test.sh iOS latest $(GIT-REF) YES
+	./scripts/xcode-test.sh iOS latest $(GIT-REF) YES test Test
 	./scripts/xcode-slowest-tests.sh
 .PHONY: test
 

Package.swift

@@ -19,6 +19,7 @@ let package = Package(
                 "SentryCrash/"
             ],
             publicHeadersPath: "Sentry/Public/",
+            cSettings: [.unsafeFlags(["-DSENTRY_UIKIT_LINKED=1"])],
             cxxSettings: [
                 .define("GCC_ENABLE_CPP_EXCEPTIONS", to: "YES"),
                 .headerSearchPath("Sentry/include"),

Samples/iOS-Swift/iOS-Swift/ExtraViewController.swift

@@ -30,7 +30,7 @@ class ExtraViewController: UIViewController {
         }
 
         SentrySDK.reportFullyDisplayed()
-
+        
         Timer.scheduledTimer(withTimeInterval: 0.5, repeats: true) { _ in
             self.framesLabel?.text = "Frames Total:\(PrivateSentrySDKOnly.currentScreenFrames.total) Slow:\(PrivateSentrySDKOnly.currentScreenFrames.slow) Frozen:\(PrivateSentrySDKOnly.currentScreenFrames.frozen)"
         }

Sentry.podspec

@@ -19,7 +19,8 @@ Pod::Spec.new do |s|
   s.pod_target_xcconfig = {
       'GCC_ENABLE_CPP_EXCEPTIONS' => 'YES',
       'CLANG_CXX_LANGUAGE_STANDARD' => 'c++14',
-      'CLANG_CXX_LIBRARY' => 'libc++'
+      'CLANG_CXX_LIBRARY' => 'libc++',
+      'GCC_PREPROCESSOR_DEFINITIONS' => 'SENTRY_UIKIT_LINKED=1'
   }
   s.watchos.pod_target_xcconfig = {
       'OTHER_LDFLAGS' => '$(inherited) -framework WatchKit'

Sentry.xcodeproj/xcshareddata/xcschemes/Sentry.xcscheme

@@ -76,6 +76,9 @@
                <Test
                   Identifier = "SentrySubClassFinderTests/testActOnSubclassesOfViewController()">
                </Test>
+               <Test
+                  Identifier = "SentryThreadInspectorTests/testStacktraceHasFrames_forEveryThread()">
+               </Test>
             </SkippedTests>
          </TestableReference>
          <TestableReference

SentryTestUtils/SentryTestUtils-ObjC-BridgingHeader.h

@@ -1,5 +1,11 @@
 #import "SentryDefines.h"
 
+#if TARGET_OS_IOS || TARGET_OS_TV
+#    define SENTRY_UIKIT_AVAILABLE 1
+#else
+#    define SENTRY_UIKIT_AVAILABLE 0
+#endif
+
 #if SENTRY_HAS_UIKIT
 #    import "SentryAppStartTracker.h"
 #    import "SentryDisplayLinkWrapper.h"

Sources/Sentry/PrivateSentrySDKOnly.mm

@@ -27,7 +27,7 @@ @implementation PrivateSentrySDKOnly
 static BOOL _appStartMeasurementHybridSDKMode = NO;
 #if SENTRY_HAS_UIKIT
 static BOOL _framesTrackingMeasurementHybridSDKMode = NO;
-#endif
+#endif // SENTRY_HAS_UIKIT
 
 + (void)storeEnvelope:(SentryEnvelope *)envelope
 {
@@ -157,40 +157,77 @@ + (void)discardProfilerForTrace:(SentryId *)traceId;
 
 #endif // SENTRY_TARGET_PROFILING_SUPPORTED
 
-#if SENTRY_HAS_UIKIT
-
 + (BOOL)framesTrackingMeasurementHybridSDKMode
 {
+#if SENTRY_HAS_UIKIT
     return _framesTrackingMeasurementHybridSDKMode;
+#else
+    SENTRY_LOG_DEBUG(@"PrivateSentrySDKOnly.framesTrackingMeasurementHybridSDKMode only works with "
+                     @"UIKit enabled. Ensure you're "
+                     @"using the right configuration of Sentry that links UIKit.");
+    return NO;
+#endif // SENTRY_HAS_UIKIT
 }
 
 + (void)setFramesTrackingMeasurementHybridSDKMode:(BOOL)framesTrackingMeasurementHybridSDKMode
 {
+#if SENTRY_HAS_UIKIT
     _framesTrackingMeasurementHybridSDKMode = framesTrackingMeasurementHybridSDKMode;
+#else
+    SENTRY_LOG_DEBUG(@"PrivateSentrySDKOnly.framesTrackingMeasurementHybridSDKMode only works with "
+                     @"UIKit enabled. Ensure you're "
+                     @"using the right configuration of Sentry that links UIKit.");
+#endif // SENTRY_HAS_UIKIT
 }
 
 + (BOOL)isFramesTrackingRunning
 {
+#if SENTRY_HAS_UIKIT
     return SentryDependencyContainer.sharedInstance.framesTracker.isRunning;
+#else
+    SENTRY_LOG_DEBUG(@"PrivateSentrySDKOnly.isFramesTrackingRunning only works with UIKit enabled. "
+                     @"Ensure you're "
+                     @"using the right configuration of Sentry that links UIKit.");
+    return NO;
+#endif // SENTRY_HAS_UIKIT
 }
 
 + (SentryScreenFrames *)currentScreenFrames
 {
+#if SENTRY_HAS_UIKIT
     return SentryDependencyContainer.sharedInstance.framesTracker.currentFrames;
+#else
+    SENTRY_LOG_DEBUG(
+        @"PrivateSentrySDKOnly.currentScreenFrames only works with UIKit enabled. Ensure you're "
+        @"using the right configuration of Sentry that links UIKit.");
+    return nil;
+#endif // SENTRY_HAS_UIKIT
 }
 
 + (NSArray<NSData *> *)captureScreenshots
 {
+#if SENTRY_HAS_UIKIT
     return [SentryDependencyContainer.sharedInstance.screenshot takeScreenshots];
+#else
+    SENTRY_LOG_DEBUG(
+        @"PrivateSentrySDKOnly.captureScreenshots only works with UIKit enabled. Ensure you're "
+        @"using the right configuration of Sentry that links UIKit.");
+    return nil;
+#endif // SENTRY_HAS_UIKIT
 }
 
 + (NSData *)captureViewHierarchy
 {
+#if SENTRY_HAS_UIKIT
     return [SentryDependencyContainer.sharedInstance.viewHierarchy fetchViewHierarchy];
+#else
+    SENTRY_LOG_DEBUG(
+        @"PrivateSentrySDKOnly.captureViewHierarchy only works with UIKit enabled. Ensure you're "
+        @"using the right configuration of Sentry that links UIKit.");
+    return nil;
+#endif // SENTRY_HAS_UIKIT
 }
 
-#endif
-
 + (SentryUser *)userWithDictionary:(NSDictionary *)dictionary
 {
     return [[SentryUser alloc] initWithDictionary:dictionary];

Sources/Sentry/Public/SentryDefines.h

@@ -6,13 +6,29 @@
 #    define SENTRY_EXTERN extern __attribute__((visibility("default")))
 #endif
 
+// SENTRY_UIKIT_AVAILABLE basically means: are we on a platform where we can link UIKit?
 #if TARGET_OS_IOS || TARGET_OS_TV
+#    define SENTRY_UIKIT_AVAILABLE 1
+#else
+#    define SENTRY_UIKIT_AVAILABLE 0
+#endif
+
+// SENTRY_HAS_UIKIT means we're on a platform that can link UIKit and we're building a configuration
+// that will allow it to be autolinked. SENTRY_UIKIT_LINKED is set in GCC_PREPROCESSOR_DEFINITIONS
+// for configurations that we will allow to link UIKit by setting CLANG_MODULES_AUTOLINK to YES.
+#if SENTRY_UIKIT_AVAILABLE && SENTRY_UIKIT_LINKED
 #    define SENTRY_HAS_UIKIT 1
 #else
 #    define SENTRY_HAS_UIKIT 0
 #endif
 
-#if TARGET_OS_IOS || TARGET_OS_OSX || TARGET_OS_MACCATALYST
+#if TARGET_OS_OSX || TARGET_OS_MACCATALYST
+#    define SENTRY_TARGET_MACOS 1
+#else
+#    define SENTRY_TARGET_MACOS 0
+#endif
+
+#if TARGET_OS_IOS || SENTRY_TARGET_MACOS
 #    define SENTRY_HAS_METRIC_KIT 1
 #else
 #    define SENTRY_HAS_METRIC_KIT 0

Sources/Sentry/Public/SentryOptions.h

@@ -199,15 +199,19 @@ NS_SWIFT_NAME(Options)
  */
 @property (nonatomic) SentryScope * (^initialScope)(SentryScope *);
 
-#if SENTRY_HAS_UIKIT
+#if SENTRY_UIKIT_AVAILABLE
 /**
  * When enabled, the SDK tracks performance for UIViewController subclasses.
+ * @warning This feature is not available in @c Debug_without_UIKit and @c Release_without_UIKit
+ * configurations even when targeting iOS or tvOS platforms.
  * @note The default is @c YES .
  */
 @property (nonatomic, assign) BOOL enableUIViewControllerTracing;
 
 /**
  * Automatically attaches a screenshot when capturing an error or exception.
+ * @warning This feature is not available in @c Debug_without_UIKit and @c Release_without_UIKit
+ * configurations even when targeting iOS or tvOS platforms.
  * @note Default value is @c NO .
  */
 @property (nonatomic, assign) BOOL attachScreenshot;
@@ -216,24 +220,29 @@ NS_SWIFT_NAME(Options)
  * @warning This is an experimental feature and may still have bugs.
  * @brief Automatically attaches a textual representation of the view hierarchy when capturing an
  * error event.
+ * @warning This feature is not available in @c Debug_without_UIKit and @c Release_without_UIKit
+ * configurations even when targeting iOS or tvOS platforms.
  * @note Default value is @c NO .
  */
 @property (nonatomic, assign) BOOL attachViewHierarchy;
 
 /**
  * When enabled, the SDK creates transactions for UI events like buttons clicks, switch toggles,
  * and other ui elements that uses UIControl @c sendAction:to:forEvent:
+ * @warning This feature is not available in @c Debug_without_UIKit and @c Release_without_UIKit
+ * configurations even when targeting iOS or tvOS platforms.
  * @note Default value is @c YES .
  */
 @property (nonatomic, assign) BOOL enableUserInteractionTracing;
 
 /**
  * How long an idle transaction waits for new children after all its child spans finished. Only UI
  * event transactions are idle transactions.
+ * @warning This feature is not available in @c Debug_without_UIKit and @c Release_without_UIKit
+ * configurations even when targeting iOS or tvOS platforms.
  * @note The default is 3 seconds.
  */
 @property (nonatomic, assign) NSTimeInterval idleTimeout;
-
 /**
  * @warning This is an experimental feature and may still have bugs.
  * @brief Report pre-warmed app starts by dropping the first app start spans if pre-warming paused
@@ -242,11 +251,12 @@ NS_SWIFT_NAME(Options)
  * @note You can filter for different app start types in Discover with
  * @c app_start_type:cold.prewarmed ,
  * @c app_start_type:warm.prewarmed , @c app_start_type:cold , and @c app_start_type:warm .
+ * @warning This feature is not available in @c Debug_without_UIKit and @c Release_without_UIKit
+ * configurations even when targeting iOS or tvOS platforms.
  * @note Default value is @c NO .
  */
 @property (nonatomic, assign) BOOL enablePreWarmedAppStartTracing;
-
-#endif // SENTRY_HAS_UIKIT
+#endif // SENTRY_UIKIT_AVAILABLE
 
 /**
  * When enabled, the SDK tracks performance for HTTP requests if auto performance tracking and

Sources/Sentry/SentryAppStartMeasurement.m

@@ -1,25 +1,43 @@
 #import "SentryAppStartMeasurement.h"
 
-#if SENTRY_HAS_UIKIT
+#if SENTRY_UIKIT_AVAILABLE
 
 #    import "NSDate+SentryExtras.h"
+#    import "SentryLog.h"
 #    import <Foundation/Foundation.h>
 
 @implementation SentryAppStartMeasurement
+#    if SENTRY_HAS_UIKIT
+{
+    SentryAppStartType _type;
+    BOOL _isPreWarmed;
+    NSTimeInterval _duration;
+    NSDate *_appStartTimestamp;
+    NSDate *_runtimeInitTimestamp;
+    NSDate *_moduleInitializationTimestamp;
+    NSDate *_didFinishLaunchingTimestamp;
+}
+#    endif // SENTRY_HAS_UIKIT
 
 - (instancetype)initWithType:(SentryAppStartType)type
               appStartTimestamp:(NSDate *)appStartTimestamp
                        duration:(NSTimeInterval)duration
            runtimeInitTimestamp:(NSDate *)runtimeInitTimestamp
     didFinishLaunchingTimestamp:(NSDate *)didFinishLaunchingTimestamp
 {
+#    if SENTRY_HAS_UIKIT
     return [self initWithType:type
                           isPreWarmed:NO
                     appStartTimestamp:appStartTimestamp
                              duration:duration
                  runtimeInitTimestamp:runtimeInitTimestamp
         moduleInitializationTimestamp:[NSDate dateWithTimeIntervalSince1970:0]
           didFinishLaunchingTimestamp:didFinishLaunchingTimestamp];
+#    else
+    SENTRY_LOG_DEBUG(@"SentryAppStartMeasurement only works with UIKit enabled. Ensure you're "
+                     @"using the right configuration of Sentry that links UIKit.");
+    return nil;
+#    endif // SENTRY_HAS_UIKIT
 }
 
 - (instancetype)initWithType:(SentryAppStartType)type
@@ -30,6 +48,7 @@ - (instancetype)initWithType:(SentryAppStartType)type
     moduleInitializationTimestamp:(NSDate *)moduleInitializationTimestamp
       didFinishLaunchingTimestamp:(NSDate *)didFinishLaunchingTimestamp
 {
+#    if SENTRY_HAS_UIKIT
     if (self = [super init]) {
         _type = type;
         _isPreWarmed = isPreWarmed;
@@ -41,8 +60,13 @@ - (instancetype)initWithType:(SentryAppStartType)type
     }
 
     return self;
+#    else
+    SENTRY_LOG_DEBUG(@"SentryAppStartMeasurement only works with UIKit enabled. Ensure you're "
+                     @"using the right configuration of Sentry that links UIKit.");
+    return nil;
+#    endif // SENTRY_HAS_UIKIT
 }
 
 @end
 
-#endif // SENTRY_HAS_UIKIT
+#endif // SENTRY_UIKIT_AVAILABLE

Sources/Sentry/SentryAppStartTracker.m

@@ -4,6 +4,7 @@
 
 #    import "SentryAppStartMeasurement.h"
 #    import "SentryAppStateManager.h"
+#    import "SentryDefines.h"
 #    import "SentryLog.h"
 #    import "SentrySysctl.h"
 #    import <Foundation/Foundation.h>

Sources/Sentry/SentryAppStateManager.m

@@ -179,10 +179,11 @@ - (SentryAppState *)buildCurrentAppState
     // Is the current process being traced or not? If it is a debugger is attached.
     bool isDebugging = self.crashWrapper.isBeingTraced;
 
-    NSString *vendorId = [UIDevice.currentDevice.identifierForVendor UUIDString];
+    UIDevice *device = [UIDevice currentDevice];
+    NSString *vendorId = [device.identifierForVendor UUIDString];
 
     return [[SentryAppState alloc] initWithReleaseName:self.options.releaseName
-                                             osVersion:UIDevice.currentDevice.systemVersion
+                                             osVersion:device.systemVersion
                                               vendorId:vendorId
                                            isDebugging:isDebugging
                                    systemBootTimestamp:SentryDependencyContainer.sharedInstance