Teach Sema::MergeFunctionDecl to properly check for an out-of-line definition of a function that is declared as =default in its class definition.

First part of PR27699.

Patch by Cristina Cristescu!

Reviewed by Richard Smith and me.

llvm-svn: 269935

2 files changed, 9 insertions, 1 deletions

diff --git a/clang/lib/Sema/SemaDecl.cpp b/clang/lib/Sema/SemaDecl.cpp
index 75aca834d2c..d34d9b5688c 100644
--- a/clang/lib/Sema/SemaDecl.cpp
+++ b/clang/lib/Sema/SemaDecl.cpp
@@ -2993,7 +2993,7 @@ bool Sema::MergeFunctionDecl(FunctionDecl *New, NamedDecl *&OldD,
             << New << getSpecialMember(OldMethod);
           return true;
         }
-      } else if (OldMethod->isExplicitlyDefaulted() && !isFriend) {
+      } else if (OldMethod->getFirstDecl()->isExplicitlyDefaulted() && !isFriend) {
         Diag(NewMethod->getLocation(),
              diag::err_definition_of_explicitly_defaulted_member)
           << getSpecialMember(OldMethod);
diff --git a/clang/test/SemaCXX/cxx0x-defaulted-functions.cpp b/clang/test/SemaCXX/cxx0x-defaulted-functions.cpp
index 617a2571631..2aaf6197b64 100644
--- a/clang/test/SemaCXX/cxx0x-defaulted-functions.cpp
+++ b/clang/test/SemaCXX/cxx0x-defaulted-functions.cpp
@@ -150,6 +150,14 @@ namespace PR13527 {
   Y::~Y() = default; // expected-error {{definition of explicitly defaulted}}
 }
 
+namespace PR27699 {
+  struct X {
+    X();
+  };
+  X::X() = default; // expected-note {{here}}
+  X::X() = default; // expected-error {{redefinition of 'X'}}
+}
+
 namespace PR14577 {
   template<typename T>
   struct Outer {