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Sebastian TottéandClaude Opus 5
ecfd9af9d6
DebugBridgeTouch.m and its header both promise the code is DEBUG-only and
never shipped:
"Uses these private UIKit selectors (DEBUG-only; never shipped to App Store)"
"DEBUG-only — never link in Release."
Nothing enforced it. The only guard was `#if TARGET_OS_IOS`, so a Release build
for iOS compiled the entire implementation in, private API and all.
Measured on a real app (an iOS Release build, `nm -j` on the app binary):
DebugBridge symbols 15
IOHIDEventCreateDigitizer 2
AXSSetAutomationEnabled 1 symbol, 2 strings
IOKit.framework 4 strings
including +[DebugBridgeTouch sendTapAtPoint:inWindow:] and
_OBJC_CLASS_$_DebugBridgeTouch. That is a Guideline 2.5.1 private-API exposure
in a shippable binary, and it fails Package.swift's own stated CI invariant:
nm -j build/Release/<binary> | grep -q DebugBridge && exit 1
WHY THE EXISTING GUARD DOES NOT COVER THIS
Package.swift documents the protection as `.when(configuration: .debug)` on the
consuming target's dependency. That works for SwiftPM consumers. It cannot be
expressed by an app that integrates DebugBridge as a local package inside an
.xcodeproj: Xcode's Filters column under Frameworks, Libraries, and Embedded
Content offers platform conditions only — iOS, macOS, visionOS — never build
configuration. So for xcodeproj consumers the documented guard silently does
nothing, which is precisely the case that was measured.
The Swift targets were already safe: all four .swift files are `#if DEBUG`
guarded and Package.swift defines DEBUG for them via swiftSettings. Only the
Objective-C target, the one that actually links private API, was unguarded.
THE FIX
1. DebugBridgeTouch.m.template now branches `#if !defined(DEBUG)` first and
emits nothing at all in Release, falling through to the existing iOS and
non-iOS branches only in Debug.
2. Package.swift.template declares DEBUG explicitly for the ObjC target:
cSettings: [.define("DEBUG", .when(configuration: .debug))]
The two Swift targets already did this. Relying on SwiftPM's implicit DEBUG
for C-family targets is not worth betting a private-API exposure on.
VERIFIED, by compiling the generated file for iOS both ways:
xcrun -sdk iphoneos clang -c DebugBridgeTouch.m -arch arm64 ...
Release (no -DDEBUG) 0 DebugBridge symbols, 0 private-API symbols, 448 B
Debug (-DDEBUG=1) 7 DebugBridge symbols, 6 private-API symbols, 13104 B
The harness is unchanged in Debug. Release now emits an empty translation unit.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>