[-Wunreachable-code] constexpr functions can be used as configuration values.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@204308 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 5 insertions, 0 deletions

diff --git a/lib/Analysis/ReachableCode.cpp b/lib/Analysis/ReachableCode.cpp
index c79a94b820..ffe576cd05 100644
--- a/lib/Analysis/ReachableCode.cpp
+++ b/lib/Analysis/ReachableCode.cpp
@@ -139,6 +139,11 @@ static bool isConfigurationValue(const Stmt *S,
     S = Ex->IgnoreParenCasts();
 
   switch (S->getStmtClass()) {
+    case Stmt::CallExprClass: {
+      const FunctionDecl *Callee =
+        dyn_cast_or_null<FunctionDecl>(cast<CallExpr>(S)->getCalleeDecl());
+      return Callee ? Callee->isConstexpr() : false;
+    }
     case Stmt::DeclRefExprClass: {
       const DeclRefExpr *DR = cast<DeclRefExpr>(S);
       const ValueDecl *D = DR->getDecl();