Make #pragma unused work for static local variables.

llvm-svn: 118500

Author: DougGregor

clang/lib/Sema/SemaAttr.cpp

@@ -282,7 +282,7 @@ void Sema::ActOnPragmaUnused(const Token *Identifiers, unsigned NumIdentifiers,
     }
 
     VarDecl *VD = Lookup.getAsSingle<VarDecl>();
-    if (!VD || !VD->hasLocalStorage()) {
+    if (!VD || !(VD->hasLocalStorage() || VD->isStaticLocal())) {
       Diag(PragmaLoc, diag::warn_pragma_unused_expected_localvar)
         << Name << SourceRange(Tok.getLocation());
       continue;

clang/test/SemaCXX/warn-unused-variables.cpp

@@ -59,3 +59,9 @@ namespace PR6948 {
     X<char> str (read_from_file()); // expected-error{{use of undeclared identifier 'read_from_file'}}
   }
 }
+
+void unused_local_static() {
+  static int x = 0;
+  static int y = 0; // expected-warning{{unused variable 'y'}}
+#pragma unused(x)
+}