Introduce __has_feature(attribute_unused_on_fields) to determine whether
the current version of clang understands __attribute__((unused)) on
fields.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@159252 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Lex/PPMacroExpansion.cpp b/lib/Lex/PPMacroExpansion.cpp
index c6aabde..a46e31a 100644
--- a/lib/Lex/PPMacroExpansion.cpp
+++ b/lib/Lex/PPMacroExpansion.cpp
@@ -632,6 +632,7 @@
.Case("attribute_objc_method_family", true)
.Case("attribute_overloadable", true)
.Case("attribute_unavailable_with_message", true)
+ .Case("attribute_unused_on_fields", true)
.Case("blocks", LangOpts.Blocks)
.Case("cxx_exceptions", LangOpts.Exceptions)
.Case("cxx_rtti", LangOpts.RTTI)
diff --git a/test/SemaCXX/warn-unused-member.cpp b/test/SemaCXX/warn-unused-member.cpp
index cabc9b6..6a7922e 100644
--- a/test/SemaCXX/warn-unused-member.cpp
+++ b/test/SemaCXX/warn-unused-member.cpp
@@ -144,6 +144,13 @@
int by_initializer_;
};
+class HasFeatureTest {
+#if __has_feature(attribute_unused_on_fields)
+ int unused_; // expected-warning{{private field 'unused_' is not used}}
+ int unused2_ __attribute__((unused)); // no-warning
+#endif
+};
+
namespace templates {
class B {
template <typename T> void f(T t);
