From: Benjamin Kramer <benny.kra@googlemail.com>
Date: Thu, 19 Oct 2017 19:07:13 +0000 (+0000)
Subject: [Sema] Fix assertion failure when checking for unused variables in a dependent context.
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=73f05d57767628a433992d6e4a44846f106fd21d;p=clang

[Sema] Fix assertion failure when checking for unused variables in a dependent context.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@316177 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Sema/SemaDecl.cpp b/lib/Sema/SemaDecl.cpp
index 9e5fa0e563..d75a469970 100644
--- a/lib/Sema/SemaDecl.cpp
+++ b/lib/Sema/SemaDecl.cpp
@@ -1724,7 +1724,7 @@ static bool ShouldDiagnoseUnusedDecl(const NamedDecl *D) {
           if (Construct && !Construct->isElidable()) {
             CXXConstructorDecl *CD = Construct->getConstructor();
             if (!CD->isTrivial() && !RD->hasAttr<WarnUnusedAttr>() &&
-                !VD->evaluateValue())
+                (VD->getInit()->isValueDependent() || !VD->evaluateValue()))
               return false;
           }
         }
diff --git a/test/SemaCXX/warn-unused-variables.cpp b/test/SemaCXX/warn-unused-variables.cpp
index 0974cf5a61..a7ac9afc36 100644
--- a/test/SemaCXX/warn-unused-variables.cpp
+++ b/test/SemaCXX/warn-unused-variables.cpp
@@ -226,4 +226,14 @@ void test(int i) {
   NoLiteral nl2(42);   // no-warning
 }
 }
+
+namespace crash {
+struct a {
+  a(const char *);
+};
+template <typename b>
+void c() {
+  a d(b::e ? "" : "");
+}
+}
 #endif