https://github.com/DanShaders updated
https://github.com/llvm/llvm-project/pull/71148
>From b26dd88d456cff7f412cdff6126d0e48454d9eb9 Mon Sep 17 00:00:00 2001
From: Dan Klishch <danilklis...@gmail.com>
Date: Fri, 3 Nov 2023 21:18:06 -0400
Subject: [PATCH] [clang] Stub out gcc_struct attribute
This commit implements gcc_struct attribute with the behavior similar to
one in GCC. Current behavior is as follows:
When C++ ABI is not "Microsoft" (i. e. when
ItaniumRecordLayoutBuilder is used), [[gcc_struct]] will locally cancel
the effect of -mms-bitfields on a record. If -mms-bitfields is not
supplied and is not a default behavior on a target, [[gcc_struct]] will
be a no-op. This should provide enough compatibility with GCC.
If C++ ABI is "Microsoft", [[gcc_struct]] will currently always produce
a diagnostic, since support for it is not yet implemented in
MicrosoftRecordLayoutBuilder. Note, however, that all the infrastructure
is ready for the future implementation.
In particular, check for default value of -mms-bitfields is moved from a
driver to TargetInfo, since it now non-trivially depends on other
supplied flags. Also this, unfortunately, makes it impossible to use
usual argument parsing for `-m{no-,}ms-bitfields`.
The patch doesn't introduce any backwards-incompatible changes, except
for situations when cc1 is called directly with `-mms-bitfields` option.
---
clang/docs/ReleaseNotes.rst | 6 ++++
clang/include/clang/Basic/Attr.td | 9 +++++-
clang/include/clang/Basic/AttrDocs.td | 16 +++++++++++
.../include/clang/Basic/DiagnosticASTKinds.td | 3 ++
clang/include/clang/Basic/LangOptions.def | 3 +-
clang/include/clang/Basic/LangOptions.h | 10 +++++++
clang/include/clang/Basic/TargetInfo.h | 4 +++
clang/include/clang/Driver/Options.td | 10 +++++--
clang/lib/AST/Decl.cpp | 9 +++++-
clang/lib/AST/RecordLayoutBuilder.cpp | 7 +++++
clang/lib/CodeGen/CGRecordLayoutBuilder.cpp | 5 +---
clang/lib/Driver/ToolChains/Clang.cpp | 10 +++++--
clang/lib/Sema/SemaDecl.cpp | 4 +--
clang/lib/Sema/SemaDeclCXX.cpp | 28 ++++++++++++-------
clang/test/CodeGen/mingw-long-double.c | 2 +-
clang/test/CodeGen/mms-bitfields.c | 2 +-
clang/test/Driver/ms-bitfields.c | 19 +++++++++----
clang/test/Layout/itanium-union-bitfield.cpp | 2 +-
...a-attribute-supported-attributes-list.test | 1 +
clang/test/Sema/mms-bitfields.c | 2 +-
clang/test/SemaCXX/ms_struct.cpp | 2 +-
clang/test/SemaCXX/ms_wide_bitfield.cpp | 2 +-
22 files changed, 118 insertions(+), 38 deletions(-)
diff --git a/clang/docs/ReleaseNotes.rst b/clang/docs/ReleaseNotes.rst
index 3cbce1be159437..a089a8586659dd 100644
--- a/clang/docs/ReleaseNotes.rst
+++ b/clang/docs/ReleaseNotes.rst
@@ -397,6 +397,12 @@ Attribute Changes in Clang
returns a type annotated with ``[[clang::coro_lifetimebound]]`` and
``[[clang::coro_return_type]]``.
This analysis can be disabled for a function by annotating the function with
``[[clang::coro_disable_lifetimebound]]``.
+- On targets with Itanium C++ ABI, Clang now supports ``[[gnu:gcc_struct]]``
+ with the behavior similar to one existing in GCC. In particular, whenever
+ ``-mms-bitfields`` command line option is provided (or if
Microsoft-compatible
+ structure layout is default on the target), ``[[gnu::gcc_struct]]`` requests
+ the compiler to follow Itanium rules for the layout of an annotated
structure.
+
Improvements to Clang's diagnostics
-----------------------------------
- Clang constexpr evaluator now prints template arguments when displaying
diff --git a/clang/include/clang/Basic/Attr.td
b/clang/include/clang/Basic/Attr.td
index a03b0e44e15f7d..50157fb2f08fd9 100644
--- a/clang/include/clang/Basic/Attr.td
+++ b/clang/include/clang/Basic/Attr.td
@@ -3711,7 +3711,14 @@ def CFGuard : InheritableAttr,
TargetSpecificAttr<TargetWindows> {
def MSStruct : InheritableAttr {
let Spellings = [GCC<"ms_struct">];
let Subjects = SubjectList<[Record]>;
- let Documentation = [Undocumented];
+ let Documentation = [MSStructDocs];
+ let SimpleHandler = 1;
+}
+
+def GCCStruct : InheritableAttr {
+ let Spellings = [GCC<"gcc_struct">];
+ let Subjects = SubjectList<[Record]>;
+ let Documentation = [MSStructDocs]; // Covers this attribute too.
let SimpleHandler = 1;
}
diff --git a/clang/include/clang/Basic/AttrDocs.td
b/clang/include/clang/Basic/AttrDocs.td
index 2e8d7752c9751e..cafc867bec21f4 100644
--- a/clang/include/clang/Basic/AttrDocs.td
+++ b/clang/include/clang/Basic/AttrDocs.td
@@ -7827,3 +7827,19 @@ requirement:
}
}];
}
+
+def MSStructDocs : Documentation {
+ let Category = DocCatDecl;
+ let Content = [{
+The ``ms_struct`` and ``gcc_struct`` attributes request the compiler to enter a
+special record layout compatibility mode which mimics the layout of Microsoft
or
+Itanium C++ ABI respectively. Obviously, if the current C++ ABI matches the
+requested ABI, the attribute does nothing. However, if it does not, annotated
+structure or class is laid out in a special compatibility mode, which slightly
+changes offsets for fields and bit-fields. The intention is to match the layout
+of the requested ABI for structures which only use C features.
+
+Note that the default behavior can be controlled by ``-mms-bitfields`` and
+``-mno-ms-bitfields`` switches and via ``#pragma ms_struct``.
+ }];
+}
diff --git a/clang/include/clang/Basic/DiagnosticASTKinds.td
b/clang/include/clang/Basic/DiagnosticASTKinds.td
index c81d17ed641084..0346b7fed8163e 100644
--- a/clang/include/clang/Basic/DiagnosticASTKinds.td
+++ b/clang/include/clang/Basic/DiagnosticASTKinds.td
@@ -998,6 +998,9 @@ def warn_npot_ms_struct : Warning<
"data types with sizes that aren't a power of two">,
DefaultError, InGroup<IncompatibleMSStruct>;
+def err_itanium_layout_unimplemented : Error<
+ "Itanium-compatible layout for the Microsoft C++ ABI is not yet supported">;
+
// -Wpadded-bitfield
def warn_padded_struct_bitfield : Warning<
"padding %select{struct|interface|class}0 %1 with %2 "
diff --git a/clang/include/clang/Basic/LangOptions.def
b/clang/include/clang/Basic/LangOptions.def
index 0428b70c602062..4014223d9a4743 100644
--- a/clang/include/clang/Basic/LangOptions.def
+++ b/clang/include/clang/Basic/LangOptions.def
@@ -149,7 +149,8 @@ LANGOPT(AssumeNothrowExceptionDtor , 1, 0, "Assume
exception object's destructor
LANGOPT(TraditionalCPP , 1, 0, "traditional CPP emulation")
LANGOPT(RTTI , 1, 1, "run-time type information")
LANGOPT(RTTIData , 1, 1, "emit run-time type information data")
-LANGOPT(MSBitfields , 1, 0, "Microsoft-compatible structure layout")
+ENUM_LANGOPT(LayoutCompatibility, LayoutCompatibilityKind, 2,
+ LayoutCompatibilityKind::Default, "Microsoft-compatible structure
layout")
LANGOPT(MSVolatile , 1, 0, "Microsoft-compatible volatile loads and
stores")
LANGOPT(Freestanding, 1, 0, "freestanding implementation")
LANGOPT(NoBuiltin , 1, 0, "disable builtin functions")
diff --git a/clang/include/clang/Basic/LangOptions.h
b/clang/include/clang/Basic/LangOptions.h
index 9f986fce2d4418..bfb4c199f2c6bd 100644
--- a/clang/include/clang/Basic/LangOptions.h
+++ b/clang/include/clang/Basic/LangOptions.h
@@ -394,6 +394,16 @@ class LangOptions : public LangOptionsBase {
enum ComplexRangeKind { CX_Full, CX_Limited, CX_Fortran };
+ enum class LayoutCompatibilityKind {
+ /// Use default layout rules of the target.
+ Default = 0,
+ /// Use Itanium rules for bit-field layout and fundamental types alignment.
+ Itanium = 1,
+ /// Use Microsoft C++ ABI rules for bit-field layout and fundamental types
+ /// alignment.
+ Microsoft = 2,
+ };
+
public:
/// The used language standard.
LangStandard::Kind LangStd;
diff --git a/clang/include/clang/Basic/TargetInfo.h
b/clang/include/clang/Basic/TargetInfo.h
index 3eb23ebdacf0ed..ce8ebef600d831 100644
--- a/clang/include/clang/Basic/TargetInfo.h
+++ b/clang/include/clang/Basic/TargetInfo.h
@@ -1741,6 +1741,10 @@ class TargetInfo : public TransferrableTargetInfo,
/// Whether to support HIP image/texture API's.
virtual bool hasHIPImageSupport() const { return true; }
+ virtual bool defaultsToMsStruct() const {
+ return getCXXABI().isMicrosoft() || getTriple().isWindowsGNUEnvironment();
+ }
+
protected:
/// Copy type and layout related info.
void copyAuxTarget(const TargetInfo *Aux);
diff --git a/clang/include/clang/Driver/Options.td
b/clang/include/clang/Driver/Options.td
index d9d6ce81b4d84a..264d0e6963057e 100644
--- a/clang/include/clang/Driver/Options.td
+++ b/clang/include/clang/Driver/Options.td
@@ -4464,9 +4464,7 @@ def mmacos_version_min_EQ : Joined<["-"],
"mmacos-version-min=">,
def : Joined<["-"], "mmacosx-version-min=">,
Group<m_Group>, Alias<mmacos_version_min_EQ>;
def mms_bitfields : Flag<["-"], "mms-bitfields">, Group<m_Group>,
- Visibility<[ClangOption, CC1Option]>,
- HelpText<"Set the default structure layout to be compatible with the
Microsoft compiler standard">,
- MarshallingInfoFlag<LangOpts<"MSBitfields">>;
+ HelpText<"Set the default structure layout to be compatible with the
Microsoft compiler standard">;
def moutline : Flag<["-"], "moutline">, Group<f_clang_Group>,
Visibility<[ClangOption, CC1Option]>,
HelpText<"Enable function outlining (AArch64 only)">;
@@ -4475,6 +4473,12 @@ def mno_outline : Flag<["-"], "mno-outline">,
Group<f_clang_Group>,
HelpText<"Disable function outlining (AArch64 only)">;
def mno_ms_bitfields : Flag<["-"], "mno-ms-bitfields">, Group<m_Group>,
HelpText<"Do not set the default structure layout to be compatible with the
Microsoft compiler standard">;
+def fms_layout_compatibility_EQ : Joined<["-"], "fms-layout-compatibility=">,
+ Visibility<[CC1Option]>,
+ HelpText<"Structure layout compatibility with Microsoft C++ ABI">,
+ Values<"default,itanium,microsoft">,
+ NormalizedValues<["Default", "Itanium", "Microsoft"]>,
NormalizedValuesScope<"LangOptions::LayoutCompatibilityKind">,
+ MarshallingInfoEnum<LangOpts<"LayoutCompatibility">, "Default">;
def mskip_rax_setup : Flag<["-"], "mskip-rax-setup">, Group<m_Group>,
Visibility<[ClangOption, CC1Option]>,
HelpText<"Skip setting up RAX register when passing variable arguments (x86
only)">,
diff --git a/clang/lib/AST/Decl.cpp b/clang/lib/AST/Decl.cpp
index e1440e5183a4e6..7aa6b2b65e61b0 100644
--- a/clang/lib/AST/Decl.cpp
+++ b/clang/lib/AST/Decl.cpp
@@ -5033,7 +5033,14 @@ void RecordDecl::completeDefinition() {
/// This which can be turned on with an attribute, pragma, or the
/// -mms-bitfields command-line option.
bool RecordDecl::isMsStruct(const ASTContext &C) const {
- return hasAttr<MSStructAttr>() || C.getLangOpts().MSBitfields == 1;
+ if (hasAttr<MSStructAttr>())
+ return true;
+ if (hasAttr<GCCStructAttr>())
+ return false;
+ auto LayoutCompatibility = C.getLangOpts().getLayoutCompatibility();
+ if (LayoutCompatibility == LangOptions::LayoutCompatibilityKind::Default)
+ return C.getTargetInfo().defaultsToMsStruct();
+ return LayoutCompatibility ==
LangOptions::LayoutCompatibilityKind::Microsoft;
}
void RecordDecl::reorderDecls(const SmallVectorImpl<Decl *> &Decls) {
diff --git a/clang/lib/AST/RecordLayoutBuilder.cpp
b/clang/lib/AST/RecordLayoutBuilder.cpp
index 706991f4fb501c..b8b369d4c48a5d 100644
--- a/clang/lib/AST/RecordLayoutBuilder.cpp
+++ b/clang/lib/AST/RecordLayoutBuilder.cpp
@@ -2795,6 +2795,13 @@ void
MicrosoftRecordLayoutBuilder::initializeLayout(const RecordDecl *RD) {
UseExternalLayout = Source->layoutRecordType(
RD, External.Size, External.Align, External.FieldOffsets,
External.BaseOffsets, External.VirtualBaseOffsets);
+
+ if (!RD->isMsStruct(Context)) {
+ auto Location = RD->getLocation();
+ if (Location.isValid())
+ Context.getDiagnostics().Report(Location,
+ diag::err_itanium_layout_unimplemented);
+ }
}
void
diff --git a/clang/lib/CodeGen/CGRecordLayoutBuilder.cpp
b/clang/lib/CodeGen/CGRecordLayoutBuilder.cpp
index 868ef810f3c4e8..945bf4351243cf 100644
--- a/clang/lib/CodeGen/CGRecordLayoutBuilder.cpp
+++ b/clang/lib/CodeGen/CGRecordLayoutBuilder.cpp
@@ -104,10 +104,7 @@ struct CGRecordLowering {
/// fields of the same formal type. We want to emit a layout with
/// these discrete storage units instead of combining them into a
/// continuous run.
- bool isDiscreteBitFieldABI() {
- return Context.getTargetInfo().getCXXABI().isMicrosoft() ||
- D->isMsStruct(Context);
- }
+ bool isDiscreteBitFieldABI() { return D->isMsStruct(Context); }
/// Helper function to check if we are targeting AAPCS.
bool isAAPCS() const {
diff --git a/clang/lib/Driver/ToolChains/Clang.cpp
b/clang/lib/Driver/ToolChains/Clang.cpp
index 9edae3fec91a87..fdcb2c999e132f 100644
--- a/clang/lib/Driver/ToolChains/Clang.cpp
+++ b/clang/lib/Driver/ToolChains/Clang.cpp
@@ -5622,9 +5622,13 @@ void Clang::ConstructJob(Compilation &C, const JobAction
&JA,
if (KernelOrKext && RawTriple.isOSDarwin())
CmdArgs.push_back("-fforbid-guard-variables");
- if (Args.hasFlag(options::OPT_mms_bitfields, options::OPT_mno_ms_bitfields,
- Triple.isWindowsGNUEnvironment())) {
- CmdArgs.push_back("-mms-bitfields");
+ if (Args.hasArg(options::OPT_mms_bitfields) ||
+ Args.hasArg(options::OPT_mno_ms_bitfields)) {
+ if (Args.hasFlag(options::OPT_mms_bitfields, options::OPT_mno_ms_bitfields,
+ false))
+ CmdArgs.push_back("-fms-layout-compatibility=microsoft");
+ else
+ CmdArgs.push_back("-fms-layout-compatibility=itanium");
}
if (Triple.isWindowsGNUEnvironment()) {
diff --git a/clang/lib/Sema/SemaDecl.cpp b/clang/lib/Sema/SemaDecl.cpp
index e92fd104d78eb5..d15ca408994f9c 100644
--- a/clang/lib/Sema/SemaDecl.cpp
+++ b/clang/lib/Sema/SemaDecl.cpp
@@ -18258,9 +18258,7 @@ ExprResult Sema::VerifyBitField(SourceLocation FieldLoc,
// ABI.
bool CStdConstraintViolation =
BitfieldIsOverwide && !getLangOpts().CPlusPlus;
- bool MSBitfieldViolation =
- Value.ugt(TypeStorageSize) &&
- (IsMsStruct || Context.getTargetInfo().getCXXABI().isMicrosoft());
+ bool MSBitfieldViolation = Value.ugt(TypeStorageSize) && IsMsStruct;
if (CStdConstraintViolation || MSBitfieldViolation) {
unsigned DiagWidth =
CStdConstraintViolation ? TypeWidth : TypeStorageSize;
diff --git a/clang/lib/Sema/SemaDeclCXX.cpp b/clang/lib/Sema/SemaDeclCXX.cpp
index 36e53c684ac4dc..07191c68228568 100644
--- a/clang/lib/Sema/SemaDeclCXX.cpp
+++ b/clang/lib/Sema/SemaDeclCXX.cpp
@@ -7255,20 +7255,28 @@ void Sema::CheckCompletedCXXClass(Scope *S,
CXXRecordDecl *Record) {
CheckCompletedMemberFunction(MD);
}
- // ms_struct is a request to use the same ABI rules as MSVC. Check
- // whether this class uses any C++ features that are implemented
- // completely differently in MSVC, and if so, emit a diagnostic.
- // That diagnostic defaults to an error, but we allow projects to
- // map it down to a warning (or ignore it). It's a fairly common
- // practice among users of the ms_struct pragma to mass-annotate
- // headers, sweeping up a bunch of types that the project doesn't
- // really rely on MSVC-compatible layout for. We must therefore
- // support "ms_struct except for C++ stuff" as a secondary ABI.
+ // {ms,gcc}_struct is a request to change ABI rules to either follow
+ // Microsoft or Itanium C++ ABI. However, even if these attributes are
+ // present, we do not layout classes following foreign ABI rules, but
+ // instead enter a special "compatibility mode", which only changes
+ // alignments of fundamental types and layout of bit fields.
+ // Check whether this class uses any C++ features that are implemented
+ // completely differently in the requested ABI, and if so, emit a
+ // diagnostic. That diagnostic defaults to an error, but we allow
+ // projects to map it down to a warning (or ignore it). It's a fairly
+ // common practice among users of the ms_struct pragma to
+ // mass-annotate headers, sweeping up a bunch of types that the
+ // project doesn't really rely on MSVC-compatible layout for. We must
+ // therefore support "ms_struct except for C++ stuff" as a secondary
+ // ABI.
// Don't emit this diagnostic if the feature was enabled as a
// language option (as opposed to via a pragma or attribute), as
// the option -mms-bitfields otherwise essentially makes it impossible
// to build C++ code, unless this diagnostic is turned off.
- if (Record->isMsStruct(Context) && !Context.getLangOpts().MSBitfields &&
+ if (Context.getLangOpts().getLayoutCompatibility() ==
+ LangOptions::LayoutCompatibilityKind::Default &&
+ Record->isMsStruct(Context) !=
+ Context.getTargetInfo().defaultsToMsStruct() &&
(Record->isPolymorphic() || Record->getNumBases())) {
Diag(Record->getLocation(), diag::warn_cxx_ms_struct);
}
diff --git a/clang/test/CodeGen/mingw-long-double.c
b/clang/test/CodeGen/mingw-long-double.c
index 4be97526f96319..0f38de6799e0d0 100644
--- a/clang/test/CodeGen/mingw-long-double.c
+++ b/clang/test/CodeGen/mingw-long-double.c
@@ -1,6 +1,6 @@
// RUN: %clang_cc1 -triple i686-windows-gnu -emit-llvm -o - %s \
// RUN: | FileCheck %s --check-prefix=GNU32
-// RUN: %clang_cc1 -triple i686-windows-gnu -emit-llvm -o - %s -mms-bitfields \
+// RUN: %clang_cc1 -triple i686-windows-gnu -emit-llvm -o - %s
-fms-layout-compatibility=microsoft \
// RUN: | FileCheck %s --check-prefix=GNU32
// RUN: %clang_cc1 -triple x86_64-windows-gnu -emit-llvm -o - %s \
// RUN: | FileCheck %s --check-prefix=GNU64
diff --git a/clang/test/CodeGen/mms-bitfields.c
b/clang/test/CodeGen/mms-bitfields.c
index 49c5c1c3e7d40d..43d189a793f7e5 100644
--- a/clang/test/CodeGen/mms-bitfields.c
+++ b/clang/test/CodeGen/mms-bitfields.c
@@ -1,4 +1,4 @@
-// RUN: %clang_cc1 -triple i386-apple-darwin10 -mms-bitfields -emit-llvm %s -o
- | FileCheck %s
+// RUN: %clang_cc1 -triple i386-apple-darwin10
-fms-layout-compatibility=microsoft -emit-llvm %s -o - | FileCheck %s
struct s1 {
int f32;
diff --git a/clang/test/Driver/ms-bitfields.c b/clang/test/Driver/ms-bitfields.c
index 031ed41e2aad67..07d1c38c3ef3be 100644
--- a/clang/test/Driver/ms-bitfields.c
+++ b/clang/test/Driver/ms-bitfields.c
@@ -1,8 +1,15 @@
-// RUN: %clang -### -target x86_64-linux-gnu %s 2>&1 | FileCheck %s
-check-prefix=NO-MSBITFIELDS
-// RUN: %clang -### -target x86_64-windows-gnu %s 2>&1 | FileCheck %s
-check-prefix=MSBITFIELDS
-// RUN: %clang -### -mno-ms-bitfields -mms-bitfields %s 2>&1 | FileCheck %s
-check-prefix=MSBITFIELDS
-// RUN: %clang -### -mms-bitfields -mno-ms-bitfields %s 2>&1 | FileCheck %s
-check-prefix=NO-MSBITFIELDS
+// RUN: %clang -### -target x86_64-linux-gnu %s 2>&1 | FileCheck %s
-check-prefix=DEFAULT-LAYOUT
+// RUN: %clang -### -target x86_64-windows-gnu %s 2>&1 | FileCheck %s
-check-prefix=DEFAULT-LAYOUT
+// RUN: %clang -### -target x86_64-windows-msvc %s 2>&1 | FileCheck %s
-check-prefix=DEFAULT-LAYOUT
+// RUN: %clang -### -mms-bitfields %s 2>&1 | FileCheck %s
-check-prefix=MICROSOFT-LAYOUT
+// RUN: %clang -### -mno-ms-bitfields %s 2>&1 | FileCheck %s
-check-prefix=ITANIUM-LAYOUT
+// RUN: %clang -### -mno-ms-bitfields -mms-bitfields %s 2>&1 | FileCheck %s
-check-prefix=MICROSOFT-LAYOUT
+// RUN: %clang -### -mms-bitfields -mno-ms-bitfields %s 2>&1 | FileCheck %s
-check-prefix=ITANIUM-LAYOUT
-// MSBITFIELDS: -mms-bitfields
-// NO-MSBITFIELDS-NOT: -mms-bitfields
+// DEFAULT-LAYOUT-NOT: -fms-layout-compatibility=itanium
+// DEFAULT-LAYOUT-NOT: -fms-layout-compatibility=microsoft
+// MICROSOFT-LAYOUT: -fms-layout-compatibility=microsoft
+// MICROSOFT-LAYOUT-NOT: -fms-layout-compatibility=itanium
+// ITANIUM-LAYOUT: -fms-layout-compatibility=itanium
+// ITANIUM-LAYOUT-NOT: -fms-layout-compatibility=microsoft
diff --git a/clang/test/Layout/itanium-union-bitfield.cpp
b/clang/test/Layout/itanium-union-bitfield.cpp
index febfc46dfee54c..34f501f4b569a7 100644
--- a/clang/test/Layout/itanium-union-bitfield.cpp
+++ b/clang/test/Layout/itanium-union-bitfield.cpp
@@ -1,4 +1,4 @@
-// RUN: %clang_cc1 -emit-llvm-only -triple %itanium_abi_triple
-fdump-record-layouts %s 2>/dev/null \
+// RUN: %clang_cc1 -emit-llvm-only -triple %itanium_abi_triple
-fms-layout-compatibility=itanium -fdump-record-layouts %s 2>/dev/null \
// RUN: | FileCheck %s
// On z/OS, a bit-field has single byte alignment. Add aligned(4) on z/OS so
the union has
diff --git a/clang/test/Misc/pragma-attribute-supported-attributes-list.test
b/clang/test/Misc/pragma-attribute-supported-attributes-list.test
index e476c15b35ded9..3fdde9aabf42b5 100644
--- a/clang/test/Misc/pragma-attribute-supported-attributes-list.test
+++ b/clang/test/Misc/pragma-attribute-supported-attributes-list.test
@@ -79,6 +79,7 @@
// CHECK-NEXT: FlagEnum (SubjectMatchRule_enum)
// CHECK-NEXT: Flatten (SubjectMatchRule_function)
// CHECK-NEXT: FunctionReturnThunks (SubjectMatchRule_function)
+// CHECK-NEXT: GCCStruct (SubjectMatchRule_record)
// CHECK-NEXT: GNUInline (SubjectMatchRule_function)
// CHECK-NEXT: HIPManaged (SubjectMatchRule_variable)
// CHECK-NEXT: Hot (SubjectMatchRule_function)
diff --git a/clang/test/Sema/mms-bitfields.c b/clang/test/Sema/mms-bitfields.c
index cee5b0669d252f..d0a67a4a3d793e 100644
--- a/clang/test/Sema/mms-bitfields.c
+++ b/clang/test/Sema/mms-bitfields.c
@@ -1,4 +1,4 @@
-// RUN: %clang_cc1 -mms-bitfields -fsyntax-only -verify -triple
x86_64-apple-darwin9 %s
+// RUN: %clang_cc1 -fms-layout-compatibility=microsoft -fsyntax-only -verify
-triple x86_64-apple-darwin9 %s
// expected-no-diagnostics
// The -mms-bitfields commandline parameter should behave the same
diff --git a/clang/test/SemaCXX/ms_struct.cpp b/clang/test/SemaCXX/ms_struct.cpp
index 995e424d1f8764..29d29e4fd6fdc8 100644
--- a/clang/test/SemaCXX/ms_struct.cpp
+++ b/clang/test/SemaCXX/ms_struct.cpp
@@ -1,7 +1,7 @@
// RUN: %clang_cc1 -fsyntax-only -DTEST_FOR_WARNING
-Wno-error=incompatible-ms-struct -verify -triple i686-apple-darwin9 -std=c++11
%s
// RUN: %clang_cc1 -fsyntax-only -DTEST_FOR_WARNING
-Wno-error=incompatible-ms-struct -verify -triple armv7-apple-darwin9
-std=c++11 %s
// RUN: %clang_cc1 -fsyntax-only -DTEST_FOR_ERROR -verify -triple
armv7-apple-darwin9 -std=c++11 %s
-// RUN: %clang_cc1 -fsyntax-only -DNO_PRAGMA -mms-bitfields -verify -triple
armv7-apple-darwin9 -std=c++11 %s
+// RUN: %clang_cc1 -fsyntax-only -DNO_PRAGMA
-fms-layout-compatibility=microsoft -verify -triple armv7-apple-darwin9
-std=c++11 %s
#ifndef NO_PRAGMA
#pragma ms_struct on
diff --git a/clang/test/SemaCXX/ms_wide_bitfield.cpp
b/clang/test/SemaCXX/ms_wide_bitfield.cpp
index 0dcc787928b0a3..76af5bdaf90930 100644
--- a/clang/test/SemaCXX/ms_wide_bitfield.cpp
+++ b/clang/test/SemaCXX/ms_wide_bitfield.cpp
@@ -1,4 +1,4 @@
-// RUN: %clang_cc1 -fno-rtti -emit-llvm-only -triple i686-pc-win32
-fdump-record-layouts -fsyntax-only -mms-bitfields -verify %s 2>&1
+// RUN: %clang_cc1 -fno-rtti -emit-llvm-only -triple i686-pc-win32
-fdump-record-layouts -fsyntax-only -fms-layout-compatibility=microsoft -verify
%s 2>&1
struct A {
char a : 9; // expected-error{{width of bit-field 'a' (9 bits) exceeds the
size of its type (8 bits)}}
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