From: Ted Kremenek <kremenek@apple.com>
Date: Fri, 5 Mar 2010 22:43:32 +0000 (+0000)
Subject: Augment __has_feature to report that Clang supports adding attribute 'unused'
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=444b035b5325973bdd5a622006fda6367a670a94;p=clang

Augment __has_feature to report that Clang supports adding attribute 'unused'
to an Objective-C instance variable.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@97850 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Lex/PPMacroExpansion.cpp b/lib/Lex/PPMacroExpansion.cpp
index d60cf0804f..5fe2ef172e 100644
--- a/lib/Lex/PPMacroExpansion.cpp
+++ b/lib/Lex/PPMacroExpansion.cpp
@@ -505,6 +505,7 @@ static bool HasFeature(const Preprocessor &PP, const IdentifierInfo *II) {
            .Case("attribute_cf_returns_retained", true)
            .Case("attribute_ns_returns_not_retained", true)
            .Case("attribute_ns_returns_retained", true)
+           .Case("attribute_objc_ivar_unused", true)
            .Default(false);
 }
 
diff --git a/test/SemaObjC/unused.m b/test/SemaObjC/unused.m
index e99418875a..a33a1bc02f 100644
--- a/test/SemaObjC/unused.m
+++ b/test/SemaObjC/unused.m
@@ -39,7 +39,15 @@ void test2() {
 // instance variables, which GCC does not.
 //===------------------------------------------------------------------------===
 
+#if __has_feature(attribute_objc_ivar_unused)
+#define UNUSED_IVAR __attribute__((unused))
+#else
+#error __attribute__((unused)) not supported on ivars
+#endif
+
 @interface TestUnusedIvar {
-  id x __attribute__((unused)); // no-warning
+  id y __attribute__((unused)); // no-warning
+  id x UNUSED_IVAR; // no-warning
 }
 @end
+