Only emit implicit constant conversion truncation warnings in reachable code. Apparently this is what GCC does, and some code depends on this. Fixes <rdar://problem/10321089>.

llvm-svn: 142716

1 files changed, 5 insertions, 3 deletions

diff --git a/clang/lib/Sema/SemaChecking.cpp b/clang/lib/Sema/SemaChecking.cpp
index f080a618b7a..daab1cd4877 100644
--- a/clang/lib/Sema/SemaChecking.cpp
+++ b/clang/lib/Sema/SemaChecking.cpp
@@ -3536,9 +3536,11 @@ void CheckImplicitConversion(Sema &S, Expr *E, QualType T,
       std::string PrettySourceValue = Value.toString(10);
       std::string PrettyTargetValue = PrettyPrintInRange(Value, TargetRange);
 
-      S.Diag(E->getExprLoc(), diag::warn_impcast_integer_precision_constant)
-        << PrettySourceValue << PrettyTargetValue
-        << E->getType() << T << E->getSourceRange() << clang::SourceRange(CC);
+      S.DiagRuntimeBehavior(E->getExprLoc(), E,
+        S.PDiag(diag::warn_impcast_integer_precision_constant)
+            << PrettySourceValue << PrettyTargetValue
+            << E->getType() << T << E->getSourceRange()
+            << clang::SourceRange(CC));
       return;
     }