Given Decl::isUsed() a flag indicating when to consider the "used"

attribute as part of the calculation. Sema::MarkDeclReferenced(), and
a few other places, want only to consider the "used" bit to determine,
e.g, whether to perform template instantiation. Fixes a linkage issue
with Boost.Serialization.

llvm-svn: 106252

1 files changed, 3 insertions, 3 deletions

diff --git a/clang/lib/AST/DeclBase.cpp b/clang/lib/AST/DeclBase.cpp
index f1b78e40fc8..104df7ae84f 100644
--- a/clang/lib/AST/DeclBase.cpp
+++ b/clang/lib/AST/DeclBase.cpp
@@ -212,17 +212,17 @@ ASTContext &Decl::getASTContext() const {
   return getTranslationUnitDecl()->getASTContext();
 }
 
-bool Decl::isUsed() const { 
+bool Decl::isUsed(bool CheckUsedAttr) const { 
   if (Used)
     return true;
   
   // Check for used attribute.
-  if (hasAttr<UsedAttr>())
+  if (CheckUsedAttr && hasAttr<UsedAttr>())
     return true;
   
   // Check redeclarations for used attribute.
   for (redecl_iterator I = redecls_begin(), E = redecls_end(); I != E; ++I) {
-    if (I->hasAttr<UsedAttr>() || I->Used)
+    if ((CheckUsedAttr && I->hasAttr<UsedAttr>()) || I->Used)
       return true;
   }