diff --git a/xcode/agg/agg.xcodeproj/project.pbxproj b/xcode/agg/agg.xcodeproj/project.pbxproj
index 1d92005357..4e6eee98ef 100644
--- a/xcode/agg/agg.xcodeproj/project.pbxproj
+++ b/xcode/agg/agg.xcodeproj/project.pbxproj
@@ -648,6 +648,7 @@
 			isa = XCBuildConfiguration;
 			baseConfigurationReference = 34F558621DBF440C00A4FC11 /* common-debug.xcconfig */;
 			buildSettings = {
+				GCC_WARN_INHIBIT_ALL_WARNINGS = YES;
 			};
 			name = Debug;
 		};
@@ -655,6 +656,7 @@
 			isa = XCBuildConfiguration;
 			baseConfigurationReference = 34F558631DBF440C00A4FC11 /* common-release.xcconfig */;
 			buildSettings = {
+				GCC_WARN_INHIBIT_ALL_WARNINGS = YES;
 			};
 			name = Release;
 		};
diff --git a/xcode/icu/icu.xcodeproj/project.pbxproj b/xcode/icu/icu.xcodeproj/project.pbxproj
index 1b1a7dda43..213f86d662 100644
--- a/xcode/icu/icu.xcodeproj/project.pbxproj
+++ b/xcode/icu/icu.xcodeproj/project.pbxproj
@@ -2524,6 +2524,7 @@
 					"U_CHARSET_IS_UTF8=1",
 					"U_DISABLE_RENAMING=1",
 				);
+				GCC_WARN_INHIBIT_ALL_WARNINGS = YES;
 				HEADER_SEARCH_PATHS = (
 					"$(inherited)",
 					"$(OMIM_ROOT)",
@@ -2547,6 +2548,7 @@
 					"U_CHARSET_IS_UTF8=1",
 					"U_DISABLE_RENAMING=1",
 				);
+				GCC_WARN_INHIBIT_ALL_WARNINGS = YES;
 				HEADER_SEARCH_PATHS = (
 					"$(inherited)",
 					"$(OMIM_ROOT)",
diff --git a/xcode/opening_hours/opening_hours.xcodeproj/project.pbxproj b/xcode/opening_hours/opening_hours.xcodeproj/project.pbxproj
index 31cbb22c1f..cab74ef760 100644
--- a/xcode/opening_hours/opening_hours.xcodeproj/project.pbxproj
+++ b/xcode/opening_hours/opening_hours.xcodeproj/project.pbxproj
@@ -486,6 +486,7 @@
 			isa = XCBuildConfiguration;
 			baseConfigurationReference = 34F558641DBF460300A4FC11 /* common-debug.xcconfig */;
 			buildSettings = {
+				GCC_WARN_INHIBIT_ALL_WARNINGS = YES;
 			};
 			name = Debug;
 		};
@@ -493,6 +494,7 @@
 			isa = XCBuildConfiguration;
 			baseConfigurationReference = 34F558651DBF460300A4FC11 /* common-release.xcconfig */;
 			buildSettings = {
+				GCC_WARN_INHIBIT_ALL_WARNINGS = YES;
 			};
 			name = Release;
 		};
diff --git a/xcode/osrm/osrm.xcodeproj/project.pbxproj b/xcode/osrm/osrm.xcodeproj/project.pbxproj
index 7cf9978648..e5600406df 100644
--- a/xcode/osrm/osrm.xcodeproj/project.pbxproj
+++ b/xcode/osrm/osrm.xcodeproj/project.pbxproj
@@ -450,6 +450,7 @@
 			isa = XCBuildConfiguration;
 			baseConfigurationReference = 34F558721DBF4B3400A4FC11 /* common-debug.xcconfig */;
 			buildSettings = {
+				GCC_WARN_INHIBIT_ALL_WARNINGS = YES;
 				HEADER_SEARCH_PATHS = (
 					"$(inherited)",
 					"$(OMIM_ROOT)/3party/osrm/osrm-backend/third_party",
@@ -462,6 +463,7 @@
 			isa = XCBuildConfiguration;
 			baseConfigurationReference = 34F558731DBF4B3400A4FC11 /* common-release.xcconfig */;
 			buildSettings = {
+				GCC_WARN_INHIBIT_ALL_WARNINGS = YES;
 				HEADER_SEARCH_PATHS = (
 					"$(inherited)",
 					"$(OMIM_ROOT)/3party/osrm/osrm-backend/third_party",
diff --git a/xcode/pugixml/pugixml.xcodeproj/project.pbxproj b/xcode/pugixml/pugixml.xcodeproj/project.pbxproj
index 01ccb2d438..1511e08333 100644
--- a/xcode/pugixml/pugixml.xcodeproj/project.pbxproj
+++ b/xcode/pugixml/pugixml.xcodeproj/project.pbxproj
@@ -140,6 +140,7 @@
 			isa = XCBuildConfiguration;
 			baseConfigurationReference = 34EBB4801DBF533D005BE9B8 /* common-debug.xcconfig */;
 			buildSettings = {
+				GCC_WARN_INHIBIT_ALL_WARNINGS = YES;
 			};
 			name = Debug;
 		};
@@ -147,6 +148,7 @@
 			isa = XCBuildConfiguration;
 			baseConfigurationReference = 34EBB4811DBF533D005BE9B8 /* common-release.xcconfig */;
 			buildSettings = {
+				GCC_WARN_INHIBIT_ALL_WARNINGS = YES;
 			};
 			name = Release;
 		};
diff --git a/xcode/succinct/succinct.xcodeproj/project.pbxproj b/xcode/succinct/succinct.xcodeproj/project.pbxproj
index 9a6e43eef9..342619a226 100644
--- a/xcode/succinct/succinct.xcodeproj/project.pbxproj
+++ b/xcode/succinct/succinct.xcodeproj/project.pbxproj
@@ -224,6 +224,7 @@
 			isa = XCBuildConfiguration;
 			baseConfigurationReference = 34F5585E1DBF42B200A4FC11 /* common-debug.xcconfig */;
 			buildSettings = {
+				GCC_WARN_INHIBIT_ALL_WARNINGS = YES;
 			};
 			name = Debug;
 		};
@@ -231,6 +232,7 @@
 			isa = XCBuildConfiguration;
 			baseConfigurationReference = 34F5585F1DBF42B200A4FC11 /* common-release.xcconfig */;
 			buildSettings = {
+				GCC_WARN_INHIBIT_ALL_WARNINGS = YES;
 			};
 			name = Release;
 		};