[clang] Fixup test added in #155573 to work when the compiler defaults to C++20. (PR #156166)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: None (dyung)

<details>
<summary>Changes</summary>

The test added in #<!-- -->155573 assumes the compiler defaults to the current default of C++17. If the compiler is changed to default to C++20, the test fails because the expected warnings about a construct being a C++20 extension are no longer emitted. This change fixes up the test to work in either C++17 or C++20 mode by disabling the warning and removing the check for it as this is not what is being tested here.

---
Full diff: https://github.com/llvm/llvm-project/pull/156166.diff


1 Files Affected:

- (modified) clang/test/AST/ByteCode/vectors.cpp (+4-4) 


``````````diff
diff --git a/clang/test/AST/ByteCode/vectors.cpp b/clang/test/AST/ByteCode/vectors.cpp
index 6b41c8d79d5b4..91fec8f86f613 100644
--- a/clang/test/AST/ByteCode/vectors.cpp
+++ b/clang/test/AST/ByteCode/vectors.cpp
@@ -1,5 +1,5 @@
-// RUN: %clang_cc1 -fexperimental-new-constant-interpreter -verify=expected,both -flax-vector-conversions=none %s
-// RUN: %clang_cc1 -verify=ref,both -flax-vector-conversions=none %s
+// RUN: %clang_cc1 -Wno-c++20-extensions -fexperimental-new-constant-interpreter -verify=expected,both -flax-vector-conversions=none %s
+// RUN: %clang_cc1 -Wno-c++20-extensions -verify=ref,both -flax-vector-conversions=none %s
 
 typedef int __attribute__((vector_size(16))) VI4;
 constexpr VI4 A = {1,2,3,4};
@@ -147,7 +147,7 @@ namespace {
 namespace Assign {
   constexpr int a2() {
       VI a = {0, 0, 0, 0};
-      VI b; // both-warning {{C++20 extension}}
+      VI b;
 
       b = {1,1,1,1};
       return b[0] + b[1] + b[2] + b[3];
@@ -161,7 +161,7 @@ namespace Assign {
 
   constexpr bool invalid() {
     v2int16_t a = {0, 0};
-    v2int_t b; // both-warning {{C++20 extension}}
+    v2int_t b;
     b = a; // both-error {{incompatible type}}
 
     return true;

``````````

</details>


https://github.com/llvm/llvm-project/pull/156166