[cfe-commits] [PATCH] Disable -Wtautological-compare in template instantiations.

[Richard Trieu]

http://llvm-reviews.chandlerc.com/D128

Files:
  test/SemaCXX/compare.cpp
  lib/Sema/SemaChecking.cpp

Index: test/SemaCXX/compare.cpp
===================================================================
--- test/SemaCXX/compare.cpp
+++ test/SemaCXX/compare.cpp
@@ -348,3 +348,16 @@
   (void)((E)x == 1);
   (void)((E)x == -1);
 }
+
+template <typename T>
+void template9 (T t, unsigned u) {
+  (void)(t >= 0);
+  (void)(u >= 0);  // expected-warning{{true}}
+
+  (void)(t != 0x100000000);
+  (void)(u != 0x100000000);  // expected-warning{{true}}
+}
+
+void test9() {
+  template9<unsigned>(1,1);
+}
Index: lib/Sema/SemaChecking.cpp
===================================================================
--- lib/Sema/SemaChecking.cpp
+++ lib/Sema/SemaChecking.cpp
@@ -4309,6 +4309,9 @@
   if (E->isValueDependent())
     return;
 
+  if (!S.ActiveTemplateInstantiations.empty())
+    return;
+
   if (op == BO_LT && IsZero(S, E->getRHS())) {
     S.Diag(E->getOperatorLoc(), diag::warn_lunsigned_always_true_comparison)
       << "< 0" << "false" << HasEnumType(E->getLHS())
@@ -4336,6 +4339,9 @@
   if (Value == 0)
     return;
 
+  if (!S.ActiveTemplateInstantiations.empty())
+    return;
+
   BinaryOperatorKind op = E->getOpcode();
   QualType OtherT = Other->getType();
   QualType ConstantT = Constant->getType();
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