Ignore pointers to incomplete types when diagnosing misaligned addresses

This is a fix for PR35509 in which we crash because we attempt to compute the
alignment of an incomplete type.

Differential Revision: https://reviews.llvm.org/D40895

llvm-svn: 320017

1 files changed, 3 insertions, 2 deletions

diff --git a/clang/lib/Sema/SemaChecking.cpp b/clang/lib/Sema/SemaChecking.cpp
index cdf162da6d1..6dec8d17301 100644
--- a/clang/lib/Sema/SemaChecking.cpp
+++ b/clang/lib/Sema/SemaChecking.cpp
@@ -12399,8 +12399,9 @@ void Sema::DiscardMisalignedMemberAddress(const Type *T, Expr *E) {
                           MisalignedMember(Op));
       if (MA != MisalignedMembers.end() &&
           (T->isIntegerType() ||
-           (T->isPointerType() &&
-            Context.getTypeAlignInChars(T->getPointeeType()) <= MA->Alignment)))
+           (T->isPointerType() && (T->getPointeeType()->isIncompleteType() ||
+                                   Context.getTypeAlignInChars(
+                                       T->getPointeeType()) <= MA->Alignment))))
         MisalignedMembers.erase(MA);
     }
   }