Fix more build warnings.

Signal.xcodeproj/project.pbxproj

@@ -2567,7 +2567,7 @@
 			attributes = {
 				LastSwiftUpdateCheck = 0920;
 				LastTestingUpgradeCheck = 0600;
-				LastUpgradeCheck = 0910;
+				LastUpgradeCheck = 0940;
 				ORGANIZATIONNAME = "Open Whisper Systems";
 				TargetAttributes = {
 					453518671FC635DD00210559 = {
@@ -3486,6 +3486,7 @@
 				CLANG_WARN_IMPLICIT_SIGN_CONVERSION = YES;
 				CLANG_WARN_INFINITE_RECURSION = YES;
 				CLANG_WARN_INT_CONVERSION = YES;
+				CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF = YES;
 				CLANG_WARN_OBJC_RECEIVER_WEAK = YES;
 				CLANG_WARN_RANGE_LOOP_ANALYSIS = YES;
 				CLANG_WARN_STRICT_PROTOTYPES = YES;
@@ -3871,7 +3872,7 @@
 				CLANG_WARN_OBJC_LITERAL_CONVERSION = YES;
 				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
 				CLANG_WARN_UNGUARDED_AVAILABILITY = YES_AGGRESSIVE;
-				CODE_SIGN_IDENTITY = "iPhone Developer";
+				CODE_SIGN_IDENTITY = "";
 				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "iPhone Developer";
 				CODE_SIGN_STYLE = Automatic;
 				COPY_PHASE_STRIP = NO;
@@ -3943,7 +3944,7 @@
 				CLANG_WARN_UNGUARDED_AVAILABILITY = YES_AGGRESSIVE;
 				CLANG_WARN_UNREACHABLE_CODE = YES;
 				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
-				CODE_SIGN_IDENTITY = "iPhone Developer";
+				CODE_SIGN_IDENTITY = "";
 				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "iPhone Developer";
 				CODE_SIGN_STYLE = Automatic;
 				COPY_PHASE_STRIP = NO;
@@ -4022,7 +4023,7 @@
 				CLANG_WARN_UNGUARDED_AVAILABILITY = YES_AGGRESSIVE;
 				CLANG_WARN_UNREACHABLE_CODE = YES;
 				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
-				CODE_SIGN_IDENTITY = "iPhone Developer";
+				CODE_SIGN_IDENTITY = "";
 				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "iPhone Developer";
 				CODE_SIGN_STYLE = Automatic;
 				COPY_PHASE_STRIP = NO;
@@ -4086,6 +4087,7 @@
 				CLANG_WARN_IMPLICIT_SIGN_CONVERSION = YES;
 				CLANG_WARN_INFINITE_RECURSION = YES;
 				CLANG_WARN_INT_CONVERSION = YES;
+				CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF = YES;
 				CLANG_WARN_OBJC_RECEIVER_WEAK = YES;
 				CLANG_WARN_RANGE_LOOP_ANALYSIS = YES;
 				CLANG_WARN_STRICT_PROTOTYPES = YES;
@@ -4156,6 +4158,7 @@
 				CLANG_WARN_IMPLICIT_SIGN_CONVERSION = YES;
 				CLANG_WARN_INFINITE_RECURSION = YES;
 				CLANG_WARN_INT_CONVERSION = YES;
+				CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF = YES;
 				CLANG_WARN_OBJC_RECEIVER_WEAK = YES;
 				CLANG_WARN_RANGE_LOOP_ANALYSIS = YES;
 				CLANG_WARN_STRICT_PROTOTYPES = YES;

Signal.xcodeproj/xcshareddata/xcschemes/Signal-Internal.xcscheme

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "0920"
+   LastUpgradeVersion = "0940"
    version = "1.3">
    <BuildAction
       parallelizeBuildables = "YES"
@@ -26,7 +26,6 @@
       buildConfiguration = "Debug"
       selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
       selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
-      language = ""
       shouldUseLaunchSchemeArgsEnv = "YES">
       <Testables>
       </Testables>
@@ -46,7 +45,6 @@
       buildConfiguration = "Debug"
       selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
       selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
-      language = ""
       launchStyle = "0"
       useCustomWorkingDirectory = "NO"
       ignoresPersistentStateOnLaunch = "NO"

Signal.xcodeproj/xcshareddata/xcschemes/Signal.xcscheme

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "0910"
+   LastUpgradeVersion = "0940"
    version = "1.3">
    <BuildAction
       parallelizeBuildables = "YES"

Signal.xcodeproj/xcshareddata/xcschemes/SignalShareExtension.xcscheme

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "0920"
+   LastUpgradeVersion = "0940"
    wasCreatedForAppExtension = "YES"
    version = "2.0">
    <BuildAction
@@ -41,7 +41,6 @@
       buildConfiguration = "Debug"
       selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
       selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
-      language = ""
       shouldUseLaunchSchemeArgsEnv = "YES">
       <Testables>
       </Testables>
@@ -61,7 +60,6 @@
       buildConfiguration = "Debug"
       selectedDebuggerIdentifier = ""
       selectedLauncherIdentifier = "Xcode.IDEFoundation.Launcher.PosixSpawn"
-      language = ""
       launchStyle = "0"
       useCustomWorkingDirectory = "NO"
       ignoresPersistentStateOnLaunch = "NO"

Signal/src/Jobs/MessageFetcherJob.swift

@@ -26,7 +26,7 @@ public class MessageFetcherJob: NSObject {
         SwiftSingletons.register(self)
     }
 
-    public func run() -> Promise<Void> {
+    @discardableResult public func run() -> Promise<Void> {
         Logger.debug("\(self.logTag) in \(#function)")
 
         guard signalService.isCensorshipCircumventionActive else {

Signal/src/ViewControllers/CallViewController.swift

@@ -616,12 +616,12 @@ class CallViewController: OWSViewController, CallObserver, CallServiceObserver,
             if formattedDate.hasPrefix("00:") {
                 // Don't show the "hours" portion of the date format unless the
                 // call duration is at least 1 hour.
-                formattedDate = formattedDate.substring(from: formattedDate.index(formattedDate.startIndex, offsetBy: 3))
+                formattedDate = String(formattedDate[formattedDate.index(formattedDate.startIndex, offsetBy: 3)...])
             } else {
                 // If showing the "hours" portion of the date format, strip any leading
                 // zeroes.
                 if formattedDate.hasPrefix("0") {
-                    formattedDate = formattedDate.substring(from: formattedDate.index(formattedDate.startIndex, offsetBy: 1))
+                    formattedDate = String(formattedDate[formattedDate.index(formattedDate.startIndex, offsetBy: 1)...])
                 }
             }
             return formattedDate

Signal/src/ViewControllers/ConversationView/ConversationViewController.m

@@ -2880,7 +2880,7 @@ typedef enum : NSUInteger {
 - (void)resetFrame
 {
     // fixes bug on frame being off after this selection
-    CGRect frame = [UIScreen mainScreen].applicationFrame;
+    CGRect frame = [UIScreen mainScreen].bounds;
     self.view.frame = frame;
 }
 

Signal/src/network/PushManager.m

@@ -112,19 +112,13 @@ NSString *const Signal_Message_MarkAsRead_Identifier = @"Signal_Message_MarkAsRe
     DDLogInfo(@"%@ received remote notification", self.logTag);
 
     [AppReadiness runNowOrWhenAppIsReady:^{
-#pragma GCC diagnostic push
-#pragma GCC diagnostic ignored "-Wunused-result"
         [self.messageFetcherJob run];
-#pragma GCC diagnostic pop
     }];
 }
 
 - (void)applicationDidBecomeActive {
     [AppReadiness runNowOrWhenAppIsReady:^{
-#pragma GCC diagnostic push
-#pragma GCC diagnostic ignored "-Wunused-result"
         [self.messageFetcherJob run];
-#pragma GCC diagnostic pop
     }];
 }
 

SignalServiceKit/src/Util/Cryptography.m

@@ -377,9 +377,9 @@ const NSUInteger kAES256_KeyByteLength = 32;
             return [paddedPlainText copy];
         } else {
             unsigned long paddingSize = paddedPlainText.length - unpaddedSize;
-            DDLogInfo(@"%@ decrypted padded attachment with unpaddedSize: %u, paddingSize: %lu",
+            DDLogInfo(@"%@ decrypted padded attachment with unpaddedSize: %lu, paddingSize: %lu",
                 self.logTag,
-                unpaddedSize,
+                (unsigned long)unpaddedSize,
                 paddingSize);
             return [paddedPlainText subdataWithRange:NSMakeRange(0, unpaddedSize)];
         }

SignalServiceKit/src/Util/OWSAnalytics.m

@@ -267,9 +267,9 @@ NSString *NSStringForOWSAnalyticsSeverity(OWSAnalyticsSeverity severity)
     dispatch_once(&onceToken, ^{
         NSOperatingSystemVersion operatingSystemVersion = [[NSProcessInfo processInfo] operatingSystemVersion];
         result = [NSString stringWithFormat:@"%zd.%zd.%zd",
-                           operatingSystemVersion.majorVersion,
-                           operatingSystemVersion.minorVersion,
-                           operatingSystemVersion.patchVersion];
+                           (NSUInteger)operatingSystemVersion.majorVersion,
+                           (NSUInteger)operatingSystemVersion.minorVersion,
+                           (NSUInteger)operatingSystemVersion.patchVersion];
     });
     return result;
 }

SignalServiceKit/src/Util/OWSOperation.m

@@ -98,7 +98,7 @@ NSString *const OWSOperationKeyIsFinished = @"isFinished";
 
 - (void)reportError:(NSError *)error
 {
-    DDLogDebug(@"%@ reportError: %@, fatal?: %d, retryable?: %d, remainingRetries: %d",
+    DDLogDebug(@"%@ reportError: %@, fatal?: %d, retryable?: %d, remainingRetries: %zd",
         self.logTag,
         error,
         error.isFatal,