Make -Wfor-loop-analysis work with C++17

For now, disable the "variable in loop condition not modified" warning to not
be emitted when there is a structured binding variable in the loop condition.

https://bugs.llvm.org/show_bug.cgi?id=39285

llvm-svn: 344828

1 files changed, 5 insertions, 1 deletions

diff --git a/clang/lib/Sema/SemaStmt.cpp b/clang/lib/Sema/SemaStmt.cpp
index f0d19475827..16ed9ed767c 100644
--- a/clang/lib/Sema/SemaStmt.cpp
+++ b/clang/lib/Sema/SemaStmt.cpp
@@ -1409,7 +1409,11 @@ namespace {
 
     void VisitDeclRefExpr(DeclRefExpr *E) {
       VarDecl *VD = dyn_cast<VarDecl>(E->getDecl());
-      if (!VD) return;
+      if (!VD) {
+        // Don't allow unhandled Decl types.
+        Simple = false;
+        return;
+      }
 
       Ranges.push_back(E->getSourceRange());