[clang] [SystemZ] z/OS only accept C initialization (PR #194023)

[Sean Perry via cfe-commits]

https://github.com/perry-ca created https://github.com/llvm/llvm-project/pull/194023

The TLS support only accept compile constant expressions (both C and C++) on z/OS.  Add #if to skip these tests on z/OS.

>From 146ba07add46163eb78a9874bf08acf4c84b2114 Mon Sep 17 00:00:00 2001
From: Sean Perry <perry at ca.ibm.com>
Date: Fri, 24 Apr 2026 14:45:54 -0400
Subject: [PATCH] z/OS only accept C initialization

---
 clang/test/AST/ByteCode/cxx17.cpp   | 2 ++
 clang/test/SemaCXX/cxx17-compat.cpp | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/clang/test/AST/ByteCode/cxx17.cpp b/clang/test/AST/ByteCode/cxx17.cpp
index 166638b0f5211..5d6e925eab32d 100644
--- a/clang/test/AST/ByteCode/cxx17.cpp
+++ b/clang/test/AST/ByteCode/cxx17.cpp
@@ -174,5 +174,7 @@ template <int I> struct std::tuple_element<I, const C> {
 
 namespace ZeroInCheckInvoke {
   constexpr C foo(const C &) { return C{}; }
+#ifndef __MVS__
   thread_local const auto &[s, t, u] = foo(C{}); // both-warning {{thread_local}}
+#endif
 }
diff --git a/clang/test/SemaCXX/cxx17-compat.cpp b/clang/test/SemaCXX/cxx17-compat.cpp
index 1c9060d388d2a..fdf9b4a1cd55e 100644
--- a/clang/test/SemaCXX/cxx17-compat.cpp
+++ b/clang/test/SemaCXX/cxx17-compat.cpp
@@ -81,6 +81,7 @@ static auto [cx, cy, cz] = C();
     // expected-warning at -4 {{structured binding declaration declared 'static' is incompatible with C++ standards before C++20}}
 #endif
 void f() {
+#ifndef __MVS__
   static thread_local auto [cx, cy, cz] = C();
 #if __cplusplus <= 201703L
     // expected-warning at -2 {{structured binding declaration declared 'static' is a C++20 extension}}
@@ -89,6 +90,7 @@ void f() {
     // expected-warning at -5 {{structured binding declaration declared 'static' is incompatible with C++ standards before C++20}}
     // expected-warning at -6 {{structured binding declaration declared 'thread_local' is incompatible with C++ standards before C++20}}
 #endif
+#endif
 }
 
 struct DefaultedComparisons {