Provide default minimum version for iOS and apply its target triplet.

- Fix incorrect clang_path override for iOS during link stage.

src/build_settings.cpp

@@ -1907,12 +1907,16 @@ gb_internal void init_build_context(TargetMetrics *cross_target, Subtarget subta
 	// does not annoy the user with version warnings.
 	if (metrics->os == TargetOs_darwin) {
 		if (!bc->minimum_os_version_string_given) {
-			bc->minimum_os_version_string = str_lit("11.0.0");
+			if (subtarget == Subtarget_Default) {
+				bc->minimum_os_version_string = str_lit("11.0.0");
+			} else if (subtarget == Subtarget_iOS || subtarget == Subtarget_iPhoneSimulator) {
+				// NOTE(harold): We default to 17.4 on iOS because that's when os_sync_wait_on_address was added and
+				//               we'd like to avoid any potential App Store issues by using the private ulock_* there.
+				bc->minimum_os_version_string = str_lit("17.4");
+			}
 		}
 
-		if (subtarget == Subtarget_Default) {
-			bc->metrics.target_triplet = concatenate_strings(permanent_allocator(), bc->metrics.target_triplet, bc->minimum_os_version_string);
-		}
+		bc->metrics.target_triplet = concatenate_strings(permanent_allocator(), bc->metrics.target_triplet, bc->minimum_os_version_string);
 	} else if (selected_subtarget == Subtarget_Android) {
 		init_android_values(bc->build_mode == BuildMode_Executable && (bc->command_kind & Command__does_build) != 0);
 	}

src/linker.cpp

@@ -431,8 +431,10 @@ try_cross_linking:;
 
 			// Link using `clang`, unless overridden by `ODIN_CLANG_PATH` environment variable.
 			const char* clang_path = gb_get_env("ODIN_CLANG_PATH", permanent_allocator());
+			bool has_odin_clang_path_env = true;
 			if (clang_path == NULL) {
 				clang_path = "clang";
+				has_odin_clang_path_env = false;
 			}
 
 			// NOTE(vassvik): needs to add the root to the library search paths, so that the full filenames of the library
@@ -779,6 +781,8 @@ try_cross_linking:;
 				char const* darwin_xcrun_sdk_name = "macosx";
 				char const* darwin_min_version_id = "macosx";
 
+				const char* original_clang_path = clang_path;
+
 				// NOTE(harold): We set the clang_path to run through xcrun because otherwise it complaints about the the sysroot
 				//               being set to 'MacOSX' even though we've set the sysroot to the correct SDK (-Wincompatible-sysroot).
 				//               This is because it is likely not using the SDK's toolchain Apple Clang but another one installed in the system.
@@ -787,18 +791,20 @@ try_cross_linking:;
 					darwin_platform_name  = "iPhoneOS";
 					darwin_xcrun_sdk_name = "iphoneos";
 					darwin_min_version_id = "ios";
-					clang_path            = "xcrun --sdk iphoneos clang";
+					if (!has_odin_clang_path_env) {
+						clang_path = "xcrun --sdk iphoneos clang";
+					}
 					break;
 				case Subtarget_iPhoneSimulator:
 					darwin_platform_name  = "iPhoneSimulator";
 					darwin_xcrun_sdk_name = "iphonesimulator";
 					darwin_min_version_id = "ios-simulator";
-					clang_path            = "xcrun --sdk iphonesimulator clang";
+					if (!has_odin_clang_path_env) {
+						clang_path = "xcrun --sdk iphonesimulator clang";
+					}
 					break;
 				}
 
-				const char* original_clang_path = clang_path;
-
 				gbString darwin_find_sdk_cmd = gb_string_make(temporary_allocator(), "");
 				darwin_find_sdk_cmd = gb_string_append_fmt(darwin_find_sdk_cmd, "xcrun --sdk %s --show-sdk-path", darwin_xcrun_sdk_name);