[PATCH] Ignore noreturn when checking function template specializations

[Reid Kleckner]

    - Split out noreturn specialization test case to test the warning.

Hi rsmith,

http://llvm-reviews.chandlerc.com/D1634

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D1634?vs=4155&id=4180#toc

Files:
  lib/Sema/SemaTemplate.cpp
  test/SemaTemplate/function-template-specialization-noreturn.cpp

Index: lib/Sema/SemaTemplate.cpp
===================================================================
--- lib/Sema/SemaTemplate.cpp
+++ lib/Sema/SemaTemplate.cpp
@@ -6415,12 +6415,15 @@
         }
       }
 
-      // Ignore differences in calling convention until decl merging.
+      // Ignore differences in calling convention and noreturn until decl
+      // merging.
       const FunctionProtoType *TmplFT =
           TmplFD->getType()->castAs<FunctionProtoType>();
-      if (FPT->getCallConv() != TmplFT->getCallConv()) {
+      if (FPT->getCallConv() != TmplFT->getCallConv() ||
+          FPT->getNoReturnAttr() != TmplFT->getNoReturnAttr()) {
         FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo();
         EPI.ExtInfo = EPI.ExtInfo.withCallingConv(TmplFT->getCallConv());
+        EPI.ExtInfo = EPI.ExtInfo.withNoReturn(TmplFT->getNoReturnAttr());
         FT = Context.getFunctionType(FPT->getResultType(), FPT->getArgTypes(),
                                      EPI);
       }
Index: test/SemaTemplate/function-template-specialization-noreturn.cpp
===================================================================
--- /dev/null
+++ test/SemaTemplate/function-template-specialization-noreturn.cpp
@@ -0,0 +1,8 @@
+// RUN: %clang_cc1 -fsyntax-only -verify %s
+
+// Split from function-template-specialization.cpp because the noreturn warning
+// requires analysis-based warnings, which the other errors in that test case
+// disable.
+
+template <int N> void __attribute__((noreturn)) f3() { __builtin_unreachable(); }
+template <> void f3<1>() { } // expected-warning {{function declared 'noreturn' should not return}}
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