280912 2024-10-04 15:33:40 -0700 Can't build WebKit's clang module on watchOS/tvOS due to availability errors 2024-10-04 15:34:08 -0700 1 1 1 Unclassified WebKit Tools / Tests WebKit Nightly Build Unspecified Unspecified NEW InRadar P2 Normal --- 280734 1 emw webkit-unassigned webkit-bug-importer oldest_to_newest 2065574 0 emw 2024-10-04 15:33:40 -0700 As part of merging WebKit's Swift overlay into the main framework <https://bugs.webkit.org/show_bug.cgi?id=280734>, I've experimented with building the overlay APIs for all Apple platforms. Presently the overlay is only built for platforms where WebKit is a public framework. When I try to build for watchOS/tvOS, I get errors emitting WebKit's underlying clang module, due to availability. For example: WebKit SwiftEmitModule normal arm64 Emitting\ module\ for\ WebKit Source/WebKit/UIProcess/API/Cocoa/NSAttributedString.h:30:9: note: while building module 'UIKit' imported from Source/WebKit/UIProcess/API/Cocoa/NSAttributedString.h:30: #import <UIKit/NSAttributedString.h> <module-includes>:1:9: note: in file included from <module-includes>:1: #import "Headers/UIKit.h" WebKitBuild/Release-appletvsimulator/SDKAdditions/System/Library/Frameworks/UIKit.framework/Headers/UIKit.h:20:9: note: in file included from WebKitBuild/Release-appletvsimulator/SDKAdditions/System/Library/Frameworks/UIKit.framewor k/Headers/UIKit.h:20: #import <UIKit/ShareSheet.h> WebKitBuild/Release-appletvsimulator/SDKAdditions/System/Library/Frameworks/UIKit.framework/Headers/ShareSheet.h:12:9: note: in file included from WebKitBuild/Release-appletvsimulator/SDKAdditions/System/Library/Frameworks/UIKit.fra mework/Headers/ShareSheet.h:12: #import <UIKit/UIDocumentInteractionController.h> WebKitBuild/Release-appletvsimulator/SDKAdditions/System/Library/Frameworks/UIKit.framework/Headers/UIDocumentInteractionController.h:20:98: error: 'UIActionSheetDelegate' is unavailable: not available on tvOS API_AVAILABLE(ios(3.2)) __TVOS_PROHIBITED @interface UIDocumentInteractionController : NSObject <UIActionSheetDelegate> WebKitBuild/Release-appletvsimulator/SDKAdditions/System/Library/Frameworks/UIKit.framework/Headers/UIActionSheet.h:63:11: note: 'UIActionSheetDelegate' has been explicitly marked unavailable here @protocol UIActionSheetDelegate <NSObject> <module-includes>:1:9: note: in file included from <module-includes>:1: #import "Headers/WebKit.h" WebKitBuild/Release-appletvsimulator/WebKit.framework/Headers/WebKit.h:26:9: note: in file included from WebKitBuild/Release-appletvsimulator/WebKit.framework/Headers/WebKit.h:26: #import <WebKit/NSAttributedString.h> Source/WebKit/UIProcess/API/Cocoa/NSAttributedString.h:30:9: error: could not build module 'UIKit' #import <UIKit/NSAttributedString.h> <unknown>:0: error: could not build Objective-C module 'WebKit' The problem is "__TVOS_PROHIBITED" indicates that UIDocumentInteractionController is SPI on tvOS. Normally, our <AvailabilityProhibitedInternal.h> header in the appropriate additions SDK in WebKitLibraries/SDKs would suppress this availability marker, but I think it's being ignored entirely because clang is looking at the `availability` modulemap in the SDK, not importing headers textually. Perhaps we need a new way to suppress availability info for building with modules. In the meantime, I don't think this blocks merging the Swift overlay. It just means we cannot bring the overlay API to these two platforms. 2065575 1 webkit-bug-importer 2024-10-04 15:34:08 -0700 <rdar://problem/137312444>