commit 73067a02db9aa1e29d6df0bece45f8b5f390ed57
author Anders Carlsson <andersca@mac.com> Fri Oct 22 23:37:08 2010 +0000
committer Anders Carlsson <andersca@mac.com> Fri Oct 22 23:37:08 2010 +0000
tree aa47d17dddf91395218071a23fa460f2cded73a2
parent 9ef5c507cea5b8abf0b202d20d67245856c94acc

Warn if a variable marked with the "unused" attribute is used. Patch by Darin Adler!

llvm-svn: 117184

clang/lib/Sema/SemaAttr.cpp

diff --git a/clang/lib/Sema/SemaAttr.cpp b/clang/lib/Sema/SemaAttr.cpp
index 0921156..d7290c3 100644
--- a/clang/lib/Sema/SemaAttr.cpp
+++ b/clang/lib/Sema/SemaAttr.cpp
@@ -288,6 +288,10 @@
       continue;
     }
 
+    // Warn if this was used before being marked unused.
+    if (VD->isUsed())
+      Diag(PragmaLoc, diag::warn_used_but_marked_unused) << Name;
+
     VD->addAttr(::new (Context) UnusedAttr(Tok.getLocation(), Context));
   }
 }