[PATCH] D24110: [Sema] Don't diagnose an array type mismatch when the new or previous declaration has a dependent type

[Akira Hatanaka via cfe-commits]

ahatanak created this revision.
ahatanak added reviewers: v.g.vassilev, rsmith.
ahatanak added a subscriber: cfe-commits.

We shouldn't compare the bounds of two arrays and issue a diagnostic if one of them is dependent.

https://reviews.llvm.org/D24110

Files:
  lib/Sema/SemaDecl.cpp
  test/SemaTemplate/array-redeclaration.cpp

Index: test/SemaTemplate/array-redeclaration.cpp
===================================================================
--- /dev/null
+++ test/SemaTemplate/array-redeclaration.cpp
@@ -0,0 +1,33 @@
+// RUN: %clang_cc1 -fsyntax-only -verify %s
+// expected-no-diagnostics
+
+extern int array[1];
+
+template <typename>
+class C {
+  enum { D };
+public:
+  template <typename A> void foo1() {
+    extern int array[((int)C<A>::k > (int)D) ? 1 : -1];
+  }
+};
+
+template<>
+class C<int> {
+public:
+  const static int k = 2;
+};
+
+void foo2() {
+  C<char> c;
+  c.foo1<int>();
+}
+
+template<int n>
+void foo3() {
+  extern int array[n ? 1 : -1];
+}
+
+void foo4() {
+  foo3<5>();
+}
Index: lib/Sema/SemaDecl.cpp
===================================================================
--- lib/Sema/SemaDecl.cpp
+++ lib/Sema/SemaDecl.cpp
@@ -3367,11 +3367,11 @@
       // We are merging a variable declaration New into Old. If it has an array
       // bound, and that bound differs from Old's bound, we should diagnose the
       // mismatch.
-      if (!NewArray->isIncompleteArrayType()) {
+      if (!NewArray->isIncompleteArrayType() && !NewArray->isDependentType()) {
         for (VarDecl *PrevVD = Old->getMostRecentDecl(); PrevVD;
              PrevVD = PrevVD->getPreviousDecl()) {
           const ArrayType *PrevVDTy = Context.getAsArrayType(PrevVD->getType());
-          if (PrevVDTy->isIncompleteArrayType())
+          if (PrevVDTy->isIncompleteArrayType() || PrevVDTy->isDependentType())
             continue;
 
           if (!Context.hasSameType(NewArray, PrevVDTy))


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