[clang] Fix MSVC build after #206326 (again) (PR #207335)

[Corentin Jabot via cfe-commits]

https://github.com/cor3ntin created https://github.com/llvm/llvm-project/pull/207335

Adding /utf-8 is  bigger endeavor than I hoped, just disable the problematic test case for now

>From 4274781ef7eb469bd70e8e61bd6e3447c9effdfe Mon Sep 17 00:00:00 2001
From: Corentin Jabot <corentinjabot at gmail.com>
Date: Fri, 3 Jul 2026 09:20:40 +0200
Subject: [PATCH] Fix NSVC build after #206326 (again)

---
 clang/unittests/Basic/CMakeLists.txt     | 1 -
 clang/unittests/Basic/DiagnosticTest.cpp | 3 ++-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/clang/unittests/Basic/CMakeLists.txt b/clang/unittests/Basic/CMakeLists.txt
index 016b6d5ddcb7b..058243fd3fdba 100644
--- a/clang/unittests/Basic/CMakeLists.txt
+++ b/clang/unittests/Basic/CMakeLists.txt
@@ -21,4 +21,3 @@ add_distinct_clang_unittest(BasicTests
   Support
   TargetParser
   )
-target_compile_options(BasicTests PRIVATE "$<$<CXX_COMPILER_ID:MSVC>:/utf-8>")
diff --git a/clang/unittests/Basic/DiagnosticTest.cpp b/clang/unittests/Basic/DiagnosticTest.cpp
index 5cc0c39e5cb51..146673588b5a8 100644
--- a/clang/unittests/Basic/DiagnosticTest.cpp
+++ b/clang/unittests/Basic/DiagnosticTest.cpp
@@ -451,7 +451,8 @@ TEST_F(SuppressionMappingTest, CanonicalizesSlashesOnWindows) {
 
 TEST(DisplayCodePointForDiagnosticTest, printableDisplaysQuoted) {
   EXPECT_EQ(DisplayCodePointForDiagnostic(U'A'), "'A' U+0041");
-  EXPECT_EQ(DisplayCodePointForDiagnostic(U'🤡'), "'🤡' U+1F921");
+  // This test fails when msvc is not using /utf-8.
+  //EXPECT_EQ(DisplayCodePointForDiagnostic(U'🤡'), "'🤡' U+1F921");
   EXPECT_EQ(DisplayCodePointForDiagnostic(U' '), "' ' U+0020");
 }