Merge pull request #85731 from Xazax-hun/suppress-arc-warning

[cxx-interop] Suppress warning in non-arc Obj-C++

Author: Xazax-hun

lib/PrintAsClang/PrintAsClang.cpp

@@ -567,6 +567,8 @@ static void writePostImportPrologue(raw_ostream &os, ModuleDecl &M) {
         "#pragma clang diagnostic ignored \"-Wunknown-pragmas\"\n"
         "#pragma clang diagnostic ignored \"-Wnullability\"\n"
         "#pragma clang diagnostic ignored "
+        "\"-Warc-bridge-casts-disallowed-in-nonarc\"\n"
+        "#pragma clang diagnostic ignored "
         "\"-Wdollar-in-identifier-extension\"\n"
         "#pragma clang diagnostic ignored "
         "\"-Wunsafe-buffer-usage\"\n"

test/Interop/SwiftToObjCxx/optional-objc-class-in-obj-cxx.swift

@@ -2,6 +2,7 @@
 
 // RUN: %target-swift-frontend %s -module-name UseCoreFoundation -enable-experimental-cxx-interop -clang-header-expose-decls=all-public -typecheck -verify -emit-clang-header-path %t/UseCoreFoundation.h
 // RUN: %target-interop-build-clangxx -std=gnu++20 -fobjc-arc -c -x objective-c++-header %t/UseCoreFoundation.h -o %t/o.o
+// RUN: %target-interop-build-clangxx -Werror=arc-bridge-casts-disallowed-in-nonarc -std=gnu++20 -fno-objc-arc -c -x objective-c++-header %t/UseCoreFoundation.h -o %t/o.o
 
 // REQUIRES: objc_interop
 
@@ -14,3 +15,7 @@ public class TestFoundationType {
         _bundle = bundle
     }
 }
+
+public func getArray() -> [String] {
+    []
+}