r199531 - Restrict redeclaration of tags introduced by using decls to MSVCCompat
Alp Toker
alp at nuanti.com
Fri Jan 17 16:59:32 PST 2014
Author: alp
Date: Fri Jan 17 18:59:32 2014
New Revision: 199531
URL: http://llvm.org/viewvc/llvm-project?rev=199531&view=rev
Log:
Restrict redeclaration of tags introduced by using decls to MSVCCompat
This limits the facility added in r199490 while we seek clarification on the
standard.
Modified:
cfe/trunk/lib/Sema/SemaDecl.cpp
cfe/trunk/test/SemaCXX/MicrosoftCompatibility.cpp
cfe/trunk/test/SemaCXX/using-decl-1.cpp
Modified: cfe/trunk/lib/Sema/SemaDecl.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Sema/SemaDecl.cpp?rev=199531&r1=199530&r2=199531&view=diff
==============================================================================
--- cfe/trunk/lib/Sema/SemaDecl.cpp (original)
+++ cfe/trunk/lib/Sema/SemaDecl.cpp Fri Jan 17 18:59:32 2014
@@ -10681,8 +10681,9 @@ Decl *Sema::ActOnTag(Scope *S, unsigned
}
if (!Previous.empty()) {
- NamedDecl *DirectPrevDecl = *Previous.begin();
- NamedDecl *PrevDecl = DirectPrevDecl->getUnderlyingDecl();
+ NamedDecl *PrevDecl = Previous.getFoundDecl();
+ NamedDecl *DirectPrevDecl =
+ getLangOpts().MSVCCompat ? *Previous.begin() : PrevDecl;
// It's okay to have a tag decl in the same scope as a typedef
// which hides a tag decl in the same scope. Finding this
Modified: cfe/trunk/test/SemaCXX/MicrosoftCompatibility.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/SemaCXX/MicrosoftCompatibility.cpp?rev=199531&r1=199530&r2=199531&view=diff
==============================================================================
--- cfe/trunk/test/SemaCXX/MicrosoftCompatibility.cpp (original)
+++ cfe/trunk/test/SemaCXX/MicrosoftCompatibility.cpp Fri Jan 17 18:59:32 2014
@@ -120,6 +120,27 @@ private:
}
+namespace using_tag_redeclaration
+{
+ struct S;
+ namespace N {
+ using ::using_tag_redeclaration::S;
+ struct S {}; // expected-note {{previous definition is here}}
+ }
+ void f() {
+ N::S s1;
+ S s2;
+ }
+ void g() {
+ struct S; // expected-note {{forward declaration of 'S'}}
+ S s3; // expected-error {{variable has incomplete type 'S'}}
+ }
+ void h() {
+ using ::using_tag_redeclaration::S;
+ struct S {}; // expected-error {{redefinition of 'S'}}
+ }
+}
+
namespace MissingTypename {
Modified: cfe/trunk/test/SemaCXX/using-decl-1.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/SemaCXX/using-decl-1.cpp?rev=199531&r1=199530&r2=199531&view=diff
==============================================================================
--- cfe/trunk/test/SemaCXX/using-decl-1.cpp (original)
+++ cfe/trunk/test/SemaCXX/using-decl-1.cpp Fri Jan 17 18:59:32 2014
@@ -119,27 +119,6 @@ namespace foo
};
}
-namespace using_tag_redeclaration
-{
- struct S;
- namespace N {
- using ::using_tag_redeclaration::S;
- struct S {}; // expected-note {{previous definition is here}}
- }
- void f() {
- N::S s1;
- S s2;
- }
- void g() {
- struct S; // expected-note {{forward declaration of 'S'}}
- S s3; // expected-error {{variable has incomplete type 'S'}}
- }
- void h() {
- using ::using_tag_redeclaration::S;
- struct S {}; // expected-error {{redefinition of 'S'}}
- }
-}
-
// Don't suggest non-typenames for positions requiring typenames.
namespace using_suggestion_tyname_val {
namespace N { void FFF() {} }
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