commit 337a5a1c3f450a1bfe69bef54dd46d6fac823e06
author Richard Smith <richard-llvm@metafoo.co.uk> Fri Jun 08 01:30:54 2012 +0000
committer Richard Smith <richard-llvm@metafoo.co.uk> Fri Jun 08 01:30:54 2012 +0000
tree 53245da1f8ceb2fddec2a17847dcc37224a42722
parent 055e9479eb3e041a10a49124c0e4eb0abbb10813

Allow friend declarations of defaulted special member functions. Only
definitions of such members are prohibited, not mere declarations.

llvm-svn: 158186

clang/lib/Sema/SemaDecl.cpp

diff --git a/clang/lib/Sema/SemaDecl.cpp b/clang/lib/Sema/SemaDecl.cpp
index fdda901..68f7469 100644
--- a/clang/lib/Sema/SemaDecl.cpp
+++ b/clang/lib/Sema/SemaDecl.cpp
@@ -2039,7 +2039,7 @@
             << New << getSpecialMember(OldMethod);
           return true;
         }
-      } else if (OldMethod->isExplicitlyDefaulted()) {
+      } else if (OldMethod->isExplicitlyDefaulted() && !isFriend) {
         Diag(NewMethod->getLocation(),
              diag::err_definition_of_explicitly_defaulted_member)
           << getSpecialMember(OldMethod);

clang/test/SemaCXX/cxx0x-defaulted-functions.cpp

diff --git a/clang/test/SemaCXX/cxx0x-defaulted-functions.cpp b/clang/test/SemaCXX/cxx0x-defaulted-functions.cpp
index 2ab0f73..595d428 100644
--- a/clang/test/SemaCXX/cxx0x-defaulted-functions.cpp
+++ b/clang/test/SemaCXX/cxx0x-defaulted-functions.cpp
@@ -51,3 +51,9 @@
 struct lit { constexpr lit() {} };
 S<lit> s_lit; // ok
 S<bar> s_bar; // ok
+
+struct Friends {
+  friend S<bar>::S();
+  friend S<bar>::S(const S&);
+  friend S<bar>::S(S&&);
+};