From aba43bb13b3aa3e81990989375fba3a902bfe1c2 Mon Sep 17 00:00:00 2001
From: Douglas Gregor <dgregor@apple.com>
Date: Tue, 26 May 2009 20:50:29 +0000
Subject: [PATCH] Make sure that CodeGen sees template instantiations.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@72433 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Sema/SemaTemplateInstantiate.cpp       |  4 ++++
 lib/Sema/SemaTemplateInstantiateDecl.cpp   |  4 ++++
 test/CodeGenCXX/explicit-instantiation.cpp | 11 +++++++++++
 3 files changed, 19 insertions(+)
 create mode 100644 test/CodeGenCXX/explicit-instantiation.cpp

diff --git a/lib/Sema/SemaTemplateInstantiate.cpp b/lib/Sema/SemaTemplateInstantiate.cpp
index a5b0911788..3c32a21073 100644
--- a/lib/Sema/SemaTemplateInstantiate.cpp
+++ b/lib/Sema/SemaTemplateInstantiate.cpp
@@ -11,6 +11,7 @@
 //===----------------------------------------------------------------------===/
 
 #include "Sema.h"
+#include "clang/AST/ASTConsumer.h"
 #include "clang/AST/ASTContext.h"
 #include "clang/AST/Expr.h"
 #include "clang/AST/DeclTemplate.h"
@@ -779,6 +780,9 @@ Sema::InstantiateClass(SourceLocation PointOfInstantiation,
   // Exit the scope of this instantiation.
   CurContext = PreviousContext;
 
+  if (!Invalid)
+    Consumer.HandleTagDeclDefinition(Instantiation);
+
   // If this is an explicit instantiation, instantiate our members, too.
   if (!Invalid && ExplicitInstantiation) {
     Inst.Clear();
diff --git a/lib/Sema/SemaTemplateInstantiateDecl.cpp b/lib/Sema/SemaTemplateInstantiateDecl.cpp
index b9a9ae8c50..90c86ec57e 100644
--- a/lib/Sema/SemaTemplateInstantiateDecl.cpp
+++ b/lib/Sema/SemaTemplateInstantiateDecl.cpp
@@ -10,6 +10,7 @@
 //
 //===----------------------------------------------------------------------===/
 #include "Sema.h"
+#include "clang/AST/ASTConsumer.h"
 #include "clang/AST/ASTContext.h"
 #include "clang/AST/DeclTemplate.h"
 #include "clang/AST/DeclVisitor.h"
@@ -622,6 +623,9 @@ void Sema::InstantiateFunctionDefinition(SourceLocation PointOfInstantiation,
                           /*IsInstantiation=*/true);
 
   CurContext = PreviousContext;
+
+  DeclGroupRef DG(Function);
+  Consumer.HandleTopLevelDecl(DG);
 }
 
 /// \brief Instantiate the definition of the given variable from its
diff --git a/test/CodeGenCXX/explicit-instantiation.cpp b/test/CodeGenCXX/explicit-instantiation.cpp
new file mode 100644
index 0000000000..38966aad2d
--- /dev/null
+++ b/test/CodeGenCXX/explicit-instantiation.cpp
@@ -0,0 +1,11 @@
+// RUN: clang-cc -emit-llvm -femit-all-decls -o %t %s &&
+// RUN: grep "_ZNK4plusIillEclERKiRKl" %t | count 1
+
+template<typename T, typename U, typename Result>
+struct plus {
+  Result operator()(const T& t, const U& u) const {
+    return t + u;
+  }
+};
+
+template struct plus<int, long, long>;
-- 
2.40.0