r316820 - Never try to instantiate a deduction guide's "definition". Fixes bogus warning when there inevitably isn't one.

[Richard Smith via cfe-commits]

Author: rsmith
Date: Fri Oct 27 18:15:00 2017
New Revision: 316820

URL: http://llvm.org/viewvc/llvm-project?rev=316820&view=rev
Log:
Never try to instantiate a deduction guide's "definition". Fixes bogus warning when there inevitably isn't one.

Modified:
    cfe/trunk/lib/Sema/SemaTemplateInstantiateDecl.cpp
    cfe/trunk/test/SemaCXX/cxx1z-class-template-argument-deduction.cpp

Modified: cfe/trunk/lib/Sema/SemaTemplateInstantiateDecl.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Sema/SemaTemplateInstantiateDecl.cpp?rev=316820&r1=316819&r2=316820&view=diff
==============================================================================
--- cfe/trunk/lib/Sema/SemaTemplateInstantiateDecl.cpp (original)
+++ cfe/trunk/lib/Sema/SemaTemplateInstantiateDecl.cpp Fri Oct 27 18:15:00 2017
@@ -3768,7 +3768,8 @@ void Sema::InstantiateFunctionDefinition
                                          bool Recursive,
                                          bool DefinitionRequired,
                                          bool AtEndOfTU) {
-  if (Function->isInvalidDecl() || Function->isDefined())
+  if (Function->isInvalidDecl() || Function->isDefined() ||
+      isa<CXXDeductionGuideDecl>(Function))
     return;
 
   // Never instantiate an explicit specialization except if it is a class scope

Modified: cfe/trunk/test/SemaCXX/cxx1z-class-template-argument-deduction.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/SemaCXX/cxx1z-class-template-argument-deduction.cpp?rev=316820&r1=316819&r2=316820&view=diff
==============================================================================
--- cfe/trunk/test/SemaCXX/cxx1z-class-template-argument-deduction.cpp (original)
+++ cfe/trunk/test/SemaCXX/cxx1z-class-template-argument-deduction.cpp Fri Oct 27 18:15:00 2017
@@ -1,5 +1,5 @@
-// RUN: %clang_cc1 -std=c++1z -verify %s -DERRORS
-// RUN: %clang_cc1 -std=c++1z -verify %s -UERRORS
+// RUN: %clang_cc1 -std=c++1z -verify %s -DERRORS -Wundefined-func-template
+// RUN: %clang_cc1 -std=c++1z -verify %s -UERRORS -Wundefined-func-template
 
 // This test is split into two because we only produce "undefined internal"
 // warnings if we didn't produce any errors.