diff --git a/clang/test/Modules/ModuleDebugInfo.cpp b/clang/test/Modules/ModuleDebugInfo.cpp
--- a/clang/test/Modules/ModuleDebugInfo.cpp
+++ b/clang/test/Modules/ModuleDebugInfo.cpp
@@ -1,3 +1,4 @@
+// UNSUPPORTED: -zos, -aix
 // Test that (the same) debug info is emitted for an Objective-C++
 // module and a C++ precompiled header.
 
diff --git a/clang/test/Modules/ModuleDebugInfo.m b/clang/test/Modules/ModuleDebugInfo.m
--- a/clang/test/Modules/ModuleDebugInfo.m
+++ b/clang/test/Modules/ModuleDebugInfo.m
@@ -1,3 +1,4 @@
+// UNSUPPORTED: -zos, -aix
 // Test that debug info is emitted for an Objective-C module and
 // a precompiled header.
 
diff --git a/clang/test/Modules/clang_module_file_info.m b/clang/test/Modules/clang_module_file_info.m
--- a/clang/test/Modules/clang_module_file_info.m
+++ b/clang/test/Modules/clang_module_file_info.m
@@ -1,4 +1,4 @@
-
+// UNSUPPORTED: -zos, -aix
 @import DependsOnModule;
 
 // RUN: rm -rf %t %t-obj
diff --git a/clang/test/Modules/debug-info-moduleimport-in-module.m b/clang/test/Modules/debug-info-moduleimport-in-module.m
--- a/clang/test/Modules/debug-info-moduleimport-in-module.m
+++ b/clang/test/Modules/debug-info-moduleimport-in-module.m
@@ -1,3 +1,4 @@
+// UNSUPPORTED: -zos, -aix
 // Test that an @import inside a module is not represented in the debug info.
 
 // REQUIRES: asserts
diff --git a/clang/test/Modules/module-debuginfo-prefix.m b/clang/test/Modules/module-debuginfo-prefix.m
--- a/clang/test/Modules/module-debuginfo-prefix.m
+++ b/clang/test/Modules/module-debuginfo-prefix.m
@@ -1,3 +1,4 @@
+// UNSUPPORTED: -zos, -aix
 // REQUIRES: asserts
 
 // Modules:
diff --git a/llvm/test/DebugInfo/X86/objc_direct.ll b/llvm/test/DebugInfo/X86/objc_direct.ll
--- a/llvm/test/DebugInfo/X86/objc_direct.ll
+++ b/llvm/test/DebugInfo/X86/objc_direct.ll
@@ -1,3 +1,4 @@
+; UNSUPPORTED: -zos, -aix
 ; RUN: llc < %s -filetype=obj -o %t
 ; RUN: llvm-dwarfdump -v %t | FileCheck %s