[PATCH] D19156: [ms][dll] #27212: Generating of implicit special members should take into account MSVC compatibility version

[Andrew V. Tischenko via cfe-commits]

avt77 created this revision.
avt77 added a reviewer: rnk.
avt77 added a subscriber: cfe-commits.

Clang creates implicit move constructor/assign operator in all cases if there is std=c++11. But MSVC supports such generation starting from version 1900 only. As result we have some binary incompatibility.

http://reviews.llvm.org/D19156

Files:
  lib/Sema/SemaDeclCXX.cpp
  test/CodeGenCXX/dllexport.cpp

Index: lib/Sema/SemaDeclCXX.cpp
===================================================================
--- lib/Sema/SemaDeclCXX.cpp
+++ lib/Sema/SemaDeclCXX.cpp
@@ -10549,6 +10549,9 @@
 }
 
 CXXMethodDecl *Sema::DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl) {
+  if (Context.getTargetInfo().getCXXABI().isMicrosoft() &&
+      !getLangOpts().isCompatibleWithMSVC(LangOptions::MSVC2015))
+    return nullptr; // It's not supported before MSVC2015
   assert(ClassDecl->needsImplicitMoveAssignment());
 
   DeclaringSpecialMember DSM(*this, ClassDecl, CXXMoveAssignment);
@@ -11162,6 +11165,9 @@
 
 CXXConstructorDecl *Sema::DeclareImplicitMoveConstructor(
                                                     CXXRecordDecl *ClassDecl) {
+  if (Context.getTargetInfo().getCXXABI().isMicrosoft() &&
+      !getLangOpts().isCompatibleWithMSVC(LangOptions::MSVC2015))
+    return nullptr; // It's not supported before MSVC2015
   assert(ClassDecl->needsImplicitMoveConstructor());
 
   DeclaringSpecialMember DSM(*this, ClassDecl, CXXMoveConstructor);
Index: test/CodeGenCXX/dllexport.cpp
===================================================================
--- test/CodeGenCXX/dllexport.cpp
+++ test/CodeGenCXX/dllexport.cpp
@@ -1,5 +1,9 @@
-// RUN: %clang_cc1 -triple i686-windows-msvc   -emit-llvm -std=c++1y -fno-threadsafe-statics -fms-extensions -O1 -mconstructor-aliases -disable-llvm-optzns -o - %s -w | FileCheck --check-prefix=MSC --check-prefix=M32 %s
-// RUN: %clang_cc1 -triple x86_64-windows-msvc -emit-llvm -std=c++1y -fno-threadsafe-statics -fms-extensions -O0 -o - %s -w | FileCheck --check-prefix=MSC --check-prefix=M64 %s
+// RUN: %clang_cc1 -triple i686-windows-msvc   -emit-llvm -std=c++1y -fno-threadsafe-statics -fms-extensions -O1 -mconstructor-aliases -disable-llvm-optzns -o - %s -w -fms-compatibility-version=19.00 | FileCheck --check-prefix=MSC --check-prefix=M32 -check-prefix=MSVC2015 %s
+// RUN: %clang_cc1 -triple i686-windows-msvc   -emit-llvm -std=c++1y -fno-threadsafe-statics -fms-extensions -O1 -mconstructor-aliases -disable-llvm-optzns -o - %s -w -fms-compatibility-version=18.00 | FileCheck --check-prefix=MSC --check-prefix=M32 -check-prefix=MSVC2013 %s
+
+// RUN: %clang_cc1 -triple x86_64-windows-msvc -emit-llvm -std=c++1y -fno-threadsafe-statics -fms-extensions -O0 -o - %s -w -fms-compatibility-version=19.00 | FileCheck --check-prefix=MSC --check-prefix=M64 -check-prefix=MSVC2015 %s
+// RUN: %clang_cc1 -triple x86_64-windows-msvc -emit-llvm -std=c++1y -fno-threadsafe-statics -fms-extensions -O0 -o - %s -w -fms-compatibility-version=18.00 | FileCheck --check-prefix=MSC --check-prefix=M64 -check-prefix=MSVC2013 %s
+
 // RUN: %clang_cc1 -triple i686-windows-gnu    -emit-llvm -std=c++1y -fno-threadsafe-statics -fms-extensions -O0 -o - %s -w | FileCheck --check-prefix=GNU --check-prefix=G32 %s
 // RUN: %clang_cc1 -triple x86_64-windows-gnu  -emit-llvm -std=c++1y -fno-threadsafe-statics -fms-extensions -O0 -o - %s -w | FileCheck --check-prefix=GNU --check-prefix=G64 %s
 
@@ -528,6 +532,8 @@
   SomeTemplate(T o = T()) : o(o) {}
   T o;
 };
+// MSVC2015-DAG: define weak_odr dllexport {{.+}} @"\01??4?$SomeTemplate at H@@Q{{.+}}@$$Q{{.+}}@@Z"
+// MSVC2013-DAG: define weak_odr dllexport {{.+}} @"\01??4?$SomeTemplate at H@@Q{{.+}}0 at A{{.+}}0@@Z"
 struct __declspec(dllexport) InheritFromTemplate : SomeTemplate<int> {};
 
 // M32-DAG: define weak_odr dllexport x86_thiscallcc void @"\01??_F?$SomeTemplate at H@@QAEXXZ"({{.*}}) comdat
@@ -592,7 +598,8 @@
 
 struct __declspec(dllexport) Y {
   // Move assignment operator:
-  // M32-DAG: define weak_odr dllexport x86_thiscallcc dereferenceable({{[0-9]+}}) %struct.Y* @"\01??4Y@@QAEAAU0@$$QAU0@@Z"
+  // MSVC2015-DAG: define weak_odr dllexport {{.+}} @"\01??4Y@@Q{{.+}}@$$Q{{.+}}@@Z"
+  // MSVC2013-DAG: define weak_odr dllexport {{.+}} @"\01??4Y@@Q{{.+}}0 at A{{.+}}0@@Z"
 
   int x;
 };


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