Keep track of when declarations are "used" according to C and

C++. This logic is required to trigger implicit instantiation of
function templates and member functions of class templates, which will
be implemented separately.

This commit includes support for -Wunused-parameter, printing warnings
for named parameters that are not used within a function/Objective-C
method/block. Fixes <rdar://problem/6505209>.

llvm-svn: 73797

1 files changed, 1 insertions, 0 deletions

diff --git a/clang/lib/Frontend/PCHReaderDecl.cpp b/clang/lib/Frontend/PCHReaderDecl.cpp
index 7c477560c64..27a08696320 100644
--- a/clang/lib/Frontend/PCHReaderDecl.cpp
+++ b/clang/lib/Frontend/PCHReaderDecl.cpp
@@ -82,6 +82,7 @@ void PCHDeclReader::VisitDecl(Decl *D) {
   if (Record[Idx++])
     D->addAttr(*Reader.getContext(), Reader.ReadAttributes());
   D->setImplicit(Record[Idx++]);
+  D->setUsed(Record[Idx++]);
   D->setAccess((AccessSpecifier)Record[Idx++]);
 }