From: Douglas Gregor <dgregor@apple.com>
Date: Wed, 30 Jun 2010 17:24:13 +0000 (+0000)
Subject: Complain about the application of a transparent_union attribute to a
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=90cd672ed107d5986936c577ce47ad7374096bd2;p=clang

Complain about the application of a transparent_union attribute to a
union whose first field has integral vector type. Also, clean up this
diagnostic a bit. Thanks to Eli for spotting this change in semantics
last week.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@107296 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/include/clang/Basic/DiagnosticSemaKinds.td b/include/clang/Basic/DiagnosticSemaKinds.td
index 752e4da7e7..fae25196fe 100644
--- a/include/clang/Basic/DiagnosticSemaKinds.td
+++ b/include/clang/Basic/DiagnosticSemaKinds.td
@@ -965,8 +965,8 @@ def warn_transparent_union_attribute_not_definition : Warning<
   "transparent_union attribute can only be applied to a union definition; "
   "attribute ignored">;
 def warn_transparent_union_attribute_floating : Warning<
-  "first field of a transparent union cannot have floating point or vector "
-  "type; transparent_union attribute ignored">;
+  "first field of a transparent union cannot have %select{floating point|"
+  "vector}0 type %1; transparent_union attribute ignored">;
 def warn_transparent_union_attribute_zero_fields : Warning<
   "transparent union definition must contain at least one field; "
   "transparent_union attribute ignored">;
diff --git a/lib/Sema/SemaDeclAttr.cpp b/lib/Sema/SemaDeclAttr.cpp
index 0f53fb92ef..db128185f2 100644
--- a/lib/Sema/SemaDeclAttr.cpp
+++ b/lib/Sema/SemaDeclAttr.cpp
@@ -1410,9 +1410,10 @@ static void HandleTransparentUnionAttr(Decl *d, const AttributeList &Attr,
 
   FieldDecl *FirstField = *Field;
   QualType FirstType = FirstField->getType();
-  if (FirstType->hasFloatingRepresentation()) {
+  if (FirstType->hasFloatingRepresentation() || FirstType->isVectorType()) {
     S.Diag(FirstField->getLocation(),
-           diag::warn_transparent_union_attribute_floating);
+           diag::warn_transparent_union_attribute_floating)
+      << FirstType->isVectorType() << FirstType;
     return;
   }
 
diff --git a/test/Sema/transparent-union.c b/test/Sema/transparent-union.c
index cdfc8506d1..27d5c2403b 100644
--- a/test/Sema/transparent-union.c
+++ b/test/Sema/transparent-union.c
@@ -38,3 +38,10 @@ typedef union {
 } TU3 __attribute__((transparent_union));
 
 typedef union { } TU4 __attribute__((transparent_union)); // expected-warning{{field}} 
+
+typedef int int4 __attribute__((ext_vector_type(4)));
+typedef union {
+  int4 vec; // expected-warning{{first field of a transparent union cannot have vector type 'int4'; transparent_union attribute ignored}}
+} TU5 __attribute__((transparent_union));
+
+