From 19f74acdf8842ceece578b7307884f5ba22d7f59 Mon Sep 17 00:00:00 2001
From: Rafael Espindola <rafael.espindola@gmail.com>
Date: Wed, 6 Jul 2011 15:46:09 +0000
Subject: [PATCH] Use attributes from the definition (if available) when
 instantiating functions.

Fixes PR10272.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@134491 91177308-0d34-0410-b5e6-96231b3b80d8
---
 include/clang/Sema/Sema.h                |  2 +-
 lib/Sema/SemaTemplateInstantiateDecl.cpp |  9 +++++++--
 test/CodeGenCXX/noinline-template.cpp    | 16 ++++++++++++++++
 3 files changed, 24 insertions(+), 3 deletions(-)
 create mode 100644 test/CodeGenCXX/noinline-template.cpp

diff --git a/include/clang/Sema/Sema.h b/include/clang/Sema/Sema.h
index 5feb94f23f..67a2678690 100644
--- a/include/clang/Sema/Sema.h
+++ b/include/clang/Sema/Sema.h
@@ -4838,7 +4838,7 @@ public:
                    bool Complain = true);
 
   void InstantiateAttrs(const MultiLevelTemplateArgumentList &TemplateArgs,
-                        Decl *Pattern, Decl *Inst);
+                        const Decl *Pattern, Decl *Inst);
 
   bool
   InstantiateClassTemplateSpecialization(SourceLocation PointOfInstantiation,
diff --git a/lib/Sema/SemaTemplateInstantiateDecl.cpp b/lib/Sema/SemaTemplateInstantiateDecl.cpp
index 0a05d0e304..29385e50b8 100644
--- a/lib/Sema/SemaTemplateInstantiateDecl.cpp
+++ b/lib/Sema/SemaTemplateInstantiateDecl.cpp
@@ -59,7 +59,7 @@ bool TemplateDeclInstantiator::SubstQualifier(const TagDecl *OldDecl,
 
 // FIXME: Is this still too simple?
 void Sema::InstantiateAttrs(const MultiLevelTemplateArgumentList &TemplateArgs,
-                            Decl *Tmpl, Decl *New) {
+                            const Decl *Tmpl, Decl *New) {
   for (AttrVec::const_iterator i = Tmpl->attr_begin(), e = Tmpl->attr_end();
        i != e; ++i) {
     const Attr *TmplAttr = *i;
@@ -2283,7 +2283,12 @@ TemplateDeclInstantiator::InitFunctionInstantiation(FunctionDecl *New,
                                                  EPI));
   }
 
-  SemaRef.InstantiateAttrs(TemplateArgs, Tmpl, New);
+  const FunctionDecl* Definition = Tmpl;
+
+  // Get the definition. Leaves the variable unchanged if undefined.
+  Tmpl->isDefined(Definition);
+
+  SemaRef.InstantiateAttrs(TemplateArgs, Definition, New);
 
   return false;
 }
diff --git a/test/CodeGenCXX/noinline-template.cpp b/test/CodeGenCXX/noinline-template.cpp
new file mode 100644
index 0000000000..6ee3935bc0
--- /dev/null
+++ b/test/CodeGenCXX/noinline-template.cpp
@@ -0,0 +1,16 @@
+// RUN: %clang_cc1 %s  -emit-llvm -o - | FileCheck %s
+
+// This was a problem in Sema, but only shows up as noinline missing
+// in CodeGen.
+
+// CHECK: define linkonce_odr void @_ZN6VectorIiE13growStorageByEv(%struct.Vector* %this) nounwind noinline
+
+template <class Ty> struct Vector  {
+  void growStorageBy();
+};
+template <class T> __attribute__((noinline)) void Vector<T>::growStorageBy() {
+}
+void foo() {
+ Vector<int> strs;
+ strs.growStorageBy();
+}
-- 
2.40.0