Fix another unnecessary-struct-padding issue.

llvm-svn: 121352

clang/lib/AST/RecordLayoutBuilder.cpp

@@ -807,8 +807,17 @@ void RecordLayoutBuilder::DeterminePrimaryBase(const CXXRecordDecl *RD) {
   Size += GetVirtualPointersSize(RD);
   DataSize = Size;
 
+  unsigned UnpackedBaseAlign = Context.Target.getPointerAlign(0);
+  unsigned BaseAlign = (Packed) ? 8 : UnpackedBaseAlign;
+
+  // The maximum field alignment overrides base align.
+  if (MaxFieldAlignment) {
+    BaseAlign = std::min(BaseAlign, MaxFieldAlignment);
+    UnpackedBaseAlign = std::min(UnpackedBaseAlign, MaxFieldAlignment);
+  }
+
   // Update the alignment.
-  UpdateAlignment(Context.Target.getPointerAlign(0));
+  UpdateAlignment(BaseAlign, UnpackedBaseAlign);
 }
 
 BaseSubobjectInfo *

clang/test/SemaCXX/pragma-pack.cpp

@@ -6,11 +6,29 @@ struct Base {
   int i;
 };
 
-#pragma pack(1)
+#pragma pack(push, 1)
 struct Sub : public Base {
   char c;
 };
+#pragma pack(pop)
 
 int check[sizeof(Sub) == 5 ? 1 : -1];
 
 }
+
+namespace check2 {
+
+struct Base {
+  virtual ~Base();
+  int x;
+};
+
+#pragma pack(push, 1)
+struct Sub : virtual Base {
+  char c;
+};
+#pragma pack(pop)
+
+int check[sizeof(Sub) == 13 ? 1 : -1];
+
+}