Add a new Ignored attribute type, and use it for may_alias.

llvm-svn: 64446

3 files changed, 5 insertions, 0 deletions

diff --git a/clang/include/clang/Parse/AttributeList.h b/clang/include/clang/Parse/AttributeList.h
index e5384ddbcd1..2295c30c90b 100644
--- a/clang/include/clang/Parse/AttributeList.h
+++ b/clang/include/clang/Parse/AttributeList.h
@@ -81,6 +81,7 @@ public:
     AT_nsobject,
     AT_cleanup,
     AT_nodebug,
+    IgnoredAttribute,
     UnknownAttribute
   };
   
diff --git a/clang/lib/Parse/AttributeList.cpp b/clang/lib/Parse/AttributeList.cpp
index 71712b646f8..7f18a2c325e 100644
--- a/clang/lib/Parse/AttributeList.cpp
+++ b/clang/lib/Parse/AttributeList.cpp
@@ -89,6 +89,7 @@ AttributeList::Kind AttributeList::getKind(const IdentifierInfo *Name) {
   case 9:
     if (!memcmp(Str, "dllimport", 9)) return AT_dllimport;
     if (!memcmp(Str, "dllexport", 9)) return AT_dllexport;
+    if (!memcmp(Str, "may_alias", 9)) return IgnoredAttribute;
     break;
   case 10:
     if (!memcmp(Str, "deprecated", 10)) return AT_deprecated;
diff --git a/clang/lib/Sema/SemaDeclAttr.cpp b/clang/lib/Sema/SemaDeclAttr.cpp
index 833a52b8159..b585bd544b1 100644
--- a/clang/lib/Sema/SemaDeclAttr.cpp
+++ b/clang/lib/Sema/SemaDeclAttr.cpp
@@ -1372,6 +1372,9 @@ static void ProcessDeclAttribute(Decl *D, const AttributeList &Attr, Sema &S) {
   case AttributeList::AT_pure:        HandlePureAttr      (D, Attr, S); break;
   case AttributeList::AT_cleanup:     HandleCleanupAttr   (D, Attr, S); break;
   case AttributeList::AT_nodebug:     HandleNodebugAttr   (D, Attr, S); break;
+  case AttributeList::IgnoredAttribute: 
+    // Just ignore
+    break;
   default:
 #if 0
     // TODO: when we have the full set of attributes, warn about unknown ones.