diff --git a/libdispatch.xcodeproj/project.pbxproj b/libdispatch.xcodeproj/project.pbxproj
index 5d58c56ca..a29c67c4e 100644
--- a/libdispatch.xcodeproj/project.pbxproj
+++ b/libdispatch.xcodeproj/project.pbxproj
@@ -3,7 +3,7 @@
 	archiveVersion = 1;
 	classes = {
 	};
-	objectVersion = 46;
+	objectVersion = 53;
 	objects = {
 
 /* Begin PBXAggregateTarget section */
@@ -1768,9 +1768,8 @@
 		08FB7793FE84155DC02AAC07 /* Project object */ = {
 			isa = PBXProject;
 			attributes = {
-				BuildIndependentTargetsInParallel = YES;
 				DefaultBuildSystemTypeForWorkspace = Latest;
-				LastUpgradeCheck = 1010;
+				LastUpgradeCheck = 1300;
 				TargetAttributes = {
 					3F3C9326128E637B0042B1F7 = {
 						ProvisioningStyle = Manual;
@@ -1825,14 +1824,15 @@
 				};
 			};
 			buildConfigurationList = 1DEB91EF08733DB70010E9CD /* Build configuration list for PBXProject "libdispatch" */;
-			compatibilityVersion = "Xcode 3.2";
-			developmentRegion = English;
+			compatibilityVersion = "Xcode 11.4";
+			developmentRegion = en;
 			hasScannedForEncodings = 1;
 			knownRegions = (
-				English,
-				Japanese,
-				French,
-				German,
+				ja,
+				fr,
+				de,
+				Base,
+				en,
 			);
 			mainGroup = 08FB7794FE84155DC02AAC07 /* libdispatch */;
 			projectDirPath = "";
@@ -2565,6 +2565,7 @@
 			isa = XCBuildConfiguration;
 			baseConfigurationReference = E40041AA125D705F0022B135 /* libdispatch-resolver.xcconfig */;
 			buildSettings = {
+				CLANG_ENABLE_OBJC_WEAK = YES;
 			};
 			name = Release;
 		};
@@ -2572,24 +2573,34 @@
 			isa = XCBuildConfiguration;
 			baseConfigurationReference = E43D93F11097917E004F6A62 /* libdispatch.xcconfig */;
 			buildSettings = {
+				CLANG_ANALYZER_LOCALIZABILITY_NONLOCALIZED = YES;
+				CLANG_WARN_BLOCK_CAPTURE_AUTORELEASING = YES;
+				CLANG_WARN_COMMA = YES;
+				CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF = YES;
+				CLANG_WARN_QUOTED_INCLUDE_IN_FRAMEWORK_HEADER = YES;
+				CLANG_WARN_RANGE_LOOP_ANALYSIS = YES;
+				CLANG_WARN_STRICT_PROTOTYPES = YES;
 			};
 			name = Release;
 		};
 		3F3C9357128E637B0042B1F7 /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				CLANG_ENABLE_OBJC_WEAK = YES;
 			};
 			name = Release;
 		};
 		3F3C9358128E637B0042B1F7 /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				CLANG_ENABLE_OBJC_WEAK = YES;
 			};
 			name = Debug;
 		};
 		4552540C19B1389700B88766 /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				CLANG_ENABLE_OBJC_WEAK = YES;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 			};
 			name = Release;
@@ -2597,6 +2608,7 @@
 		4552540D19B1389700B88766 /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				CLANG_ENABLE_OBJC_WEAK = YES;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 			};
 			name = Debug;
@@ -2605,6 +2617,7 @@
 			isa = XCBuildConfiguration;
 			baseConfigurationReference = 6E040C721C499C3600411A2E /* libfirehose_kernel.xcconfig */;
 			buildSettings = {
+				CLANG_ENABLE_OBJC_WEAK = YES;
 			};
 			name = Release;
 		};
@@ -2612,12 +2625,14 @@
 			isa = XCBuildConfiguration;
 			baseConfigurationReference = 6E040C721C499C3600411A2E /* libfirehose_kernel.xcconfig */;
 			buildSettings = {
+				CLANG_ENABLE_OBJC_WEAK = YES;
 			};
 			name = Debug;
 		};
 		6E2ECAFF1C49C30000A30A32 /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				CLANG_ENABLE_OBJC_WEAK = YES;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 			};
 			name = Release;
@@ -2625,6 +2640,7 @@
 		6E2ECB001C49C30000A30A32 /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				CLANG_ENABLE_OBJC_WEAK = YES;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 			};
 			name = Debug;
@@ -2632,6 +2648,7 @@
 		6E435542215B5D9D00C13177 /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				CLANG_ENABLE_OBJC_WEAK = YES;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 			};
 			name = Release;
@@ -2639,6 +2656,7 @@
 		6E435543215B5D9D00C13177 /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				CLANG_ENABLE_OBJC_WEAK = YES;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 			};
 			name = Debug;
@@ -2646,6 +2664,7 @@
 		6EA833C42162D6380045EFDC /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				CLANG_ENABLE_OBJC_WEAK = YES;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 			};
 			name = Release;
@@ -2653,6 +2672,7 @@
 		6EA833C52162D6380045EFDC /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				CLANG_ENABLE_OBJC_WEAK = YES;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 			};
 			name = Debug;
@@ -2661,6 +2681,7 @@
 			isa = XCBuildConfiguration;
 			baseConfigurationReference = 6EB4E4421BA8BD7800D7B9D2 /* libfirehose.xcconfig */;
 			buildSettings = {
+				CLANG_ENABLE_OBJC_WEAK = YES;
 			};
 			name = Release;
 		};
@@ -2668,12 +2689,14 @@
 			isa = XCBuildConfiguration;
 			baseConfigurationReference = 6EB4E4421BA8BD7800D7B9D2 /* libfirehose.xcconfig */;
 			buildSettings = {
+				CLANG_ENABLE_OBJC_WEAK = YES;
 			};
 			name = Debug;
 		};
 		92CBD7241BED924F006E0892 /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				CLANG_ENABLE_OBJC_WEAK = YES;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 			};
 			name = Release;
@@ -2681,6 +2704,7 @@
 		92CBD7251BED924F006E0892 /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				CLANG_ENABLE_OBJC_WEAK = YES;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 			};
 			name = Debug;
@@ -2688,18 +2712,21 @@
 		92F3FECC1BEC69E500025962 /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				CLANG_ENABLE_OBJC_WEAK = YES;
 			};
 			name = Release;
 		};
 		92F3FECD1BEC69E500025962 /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				CLANG_ENABLE_OBJC_WEAK = YES;
 			};
 			name = Debug;
 		};
 		9BEBA57020127D3300E6FD0D /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				CLANG_ENABLE_OBJC_WEAK = YES;
 				CODE_SIGN_STYLE = Automatic;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 			};
@@ -2708,6 +2735,7 @@
 		9BEBA57120127D3300E6FD0D /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				CLANG_ENABLE_OBJC_WEAK = YES;
 				CODE_SIGN_STYLE = Automatic;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 			};
@@ -2717,6 +2745,7 @@
 			isa = XCBuildConfiguration;
 			baseConfigurationReference = C00B0E121C5AEBF7000330B3 /* libdispatch-dyld-stub.xcconfig */;
 			buildSettings = {
+				CLANG_ENABLE_OBJC_WEAK = YES;
 			};
 			name = Release;
 		};
@@ -2724,6 +2753,7 @@
 			isa = XCBuildConfiguration;
 			baseConfigurationReference = C00B0E121C5AEBF7000330B3 /* libdispatch-dyld-stub.xcconfig */;
 			buildSettings = {
+				CLANG_ENABLE_OBJC_WEAK = YES;
 			};
 			name = Debug;
 		};
@@ -2731,6 +2761,7 @@
 			isa = XCBuildConfiguration;
 			baseConfigurationReference = C01866BE1C59735B0040FC07 /* libdispatch-mp-static.xcconfig */;
 			buildSettings = {
+				CLANG_ENABLE_OBJC_WEAK = YES;
 			};
 			name = Release;
 		};
@@ -2738,18 +2769,21 @@
 			isa = XCBuildConfiguration;
 			baseConfigurationReference = C01866BE1C59735B0040FC07 /* libdispatch-mp-static.xcconfig */;
 			buildSettings = {
+				CLANG_ENABLE_OBJC_WEAK = YES;
 			};
 			name = Debug;
 		};
 		C927F35B10FD7F0600C5AB8B /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				CLANG_ENABLE_OBJC_WEAK = YES;
 			};
 			name = Release;
 		};
 		C927F35C10FD7F0600C5AB8B /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				CLANG_ENABLE_OBJC_WEAK = YES;
 			};
 			name = Debug;
 		};
@@ -2757,6 +2791,7 @@
 			isa = XCBuildConfiguration;
 			baseConfigurationReference = E40041A9125D70590022B135 /* libdispatch-resolved.xcconfig */;
 			buildSettings = {
+				CLANG_ENABLE_OBJC_WEAK = YES;
 				DISPATCH_RESOLVED_VARIANT = armv81;
 			};
 			name = Release;
@@ -2765,6 +2800,7 @@
 			isa = XCBuildConfiguration;
 			baseConfigurationReference = E40041A9125D70590022B135 /* libdispatch-resolved.xcconfig */;
 			buildSettings = {
+				CLANG_ENABLE_OBJC_WEAK = YES;
 				DISPATCH_RESOLVED_VARIANT = armv81;
 			};
 			name = Debug;
@@ -2772,6 +2808,7 @@
 		E49F24D9125D57FA0057C971 /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				CLANG_ENABLE_OBJC_WEAK = YES;
 				WARNING_CFLAGS = (
 					"-Weverything",
 					"$(inherited)",
@@ -2782,6 +2819,7 @@
 		E49F24DA125D57FA0057C971 /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				CLANG_ENABLE_OBJC_WEAK = YES;
 				ONLY_ACTIVE_ARCH = YES;
 				WARNING_CFLAGS = (
 					"-Weverything",
@@ -2794,6 +2832,7 @@
 			isa = XCBuildConfiguration;
 			baseConfigurationReference = E4B515D9164B2E9B00E003AF /* libdispatch-introspection.xcconfig */;
 			buildSettings = {
+				CLANG_ENABLE_OBJC_WEAK = YES;
 			};
 			name = Release;
 		};
@@ -2801,6 +2840,7 @@
 			isa = XCBuildConfiguration;
 			baseConfigurationReference = E4B515D9164B2E9B00E003AF /* libdispatch-introspection.xcconfig */;
 			buildSettings = {
+				CLANG_ENABLE_OBJC_WEAK = YES;
 			};
 			name = Debug;
 		};
@@ -2808,6 +2848,15 @@
 			isa = XCBuildConfiguration;
 			baseConfigurationReference = E43D93F11097917E004F6A62 /* libdispatch.xcconfig */;
 			buildSettings = {
+				CLANG_ANALYZER_LOCALIZABILITY_NONLOCALIZED = YES;
+				CLANG_WARN_BLOCK_CAPTURE_AUTORELEASING = YES;
+				CLANG_WARN_COMMA = YES;
+				CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF = YES;
+				CLANG_WARN_QUOTED_INCLUDE_IN_FRAMEWORK_HEADER = YES;
+				CLANG_WARN_RANGE_LOOP_ANALYSIS = YES;
+				CLANG_WARN_STRICT_PROTOTYPES = YES;
+				ENABLE_TESTABILITY = YES;
+				ONLY_ACTIVE_ARCH = YES;
 			};
 			name = Debug;
 		};
@@ -2815,6 +2864,7 @@
 			isa = XCBuildConfiguration;
 			baseConfigurationReference = E40041AA125D705F0022B135 /* libdispatch-resolver.xcconfig */;
 			buildSettings = {
+				CLANG_ENABLE_OBJC_WEAK = YES;
 			};
 			name = Debug;
 		};
@@ -2822,6 +2872,7 @@
 			isa = XCBuildConfiguration;
 			baseConfigurationReference = E40041A9125D70590022B135 /* libdispatch-resolved.xcconfig */;
 			buildSettings = {
+				CLANG_ENABLE_OBJC_WEAK = YES;
 				DISPATCH_RESOLVED_VARIANT = mp;
 			};
 			name = Release;
@@ -2830,6 +2881,7 @@
 			isa = XCBuildConfiguration;
 			baseConfigurationReference = E40041A9125D70590022B135 /* libdispatch-resolved.xcconfig */;
 			buildSettings = {
+				CLANG_ENABLE_OBJC_WEAK = YES;
 				DISPATCH_RESOLVED_VARIANT = mp;
 			};
 			name = Debug;