[clang] [clang] Add some CodeGen tests for CWG 2xx issues (PR #80823)

[Erich Keane via cfe-commits]

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@@ -6,28 +6,36 @@
 // RUN: %clang_cc1 -std=c++23 %s -triple x86_64-linux-gnu -emit-llvm -disable-llvm-passes -o - -fexceptions -fcxx-exceptions -pedantic-errors | llvm-cxxfilt -n | FileCheck %s --check-prefixes CHECK
 // RUN: %clang_cc1 -std=c++2c %s -triple x86_64-linux-gnu -emit-llvm -disable-llvm-passes -o - -fexceptions -fcxx-exceptions -pedantic-errors | llvm-cxxfilt -n | FileCheck %s --check-prefixes CHECK
 
+#if __cplusplus == 199711L
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wvariadic-macros"
+#define static_assert(...) __extension__ _Static_assert(__VA_ARGS__)
+#pragma clang diagnostic pop
+#endif
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erichkeane wrote:

Wowzers, lot of work to make this happen, but thank you for doing it!

https://github.com/llvm/llvm-project/pull/80823