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, 6 insertions, 2 deletions

diff --git a/clang/lib/Parse/ParseDecl.cpp b/clang/lib/Parse/ParseDecl.cpp
index efabf3a7c6d..69152523a11 100644
--- a/clang/lib/Parse/ParseDecl.cpp
+++ b/clang/lib/Parse/ParseDecl.cpp
@@ -2699,8 +2699,12 @@ void Parser::ParseBracketDeclarator(Declarator &D) {
     // things like '=' and '*='.  Sema rejects these in C89 mode because they
     // are not i-c-e's, so we don't need to distinguish between the two here.
     
-    // Parse the assignment-expression now.
-    NumElements = ParseAssignmentExpression();
+    // Parse the constant-expression or assignment-expression now (depending
+    // on dialect).
+    if (getLang().CPlusPlus)
+      NumElements = ParseConstantExpression();
+    else
+      NumElements = ParseAssignmentExpression();
   }
   
   // If there was an error parsing the assignment-expression, recover.