Add __has_feature support to detect if clang supports the explicit "atomic" keyword for ObjC properties.
Fixes <rdar://problem/12953378>.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@171504 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Lex/PPMacroExpansion.cpp b/lib/Lex/PPMacroExpansion.cpp
index 49ba601..3de6cdb 100644
--- a/lib/Lex/PPMacroExpansion.cpp
+++ b/lib/Lex/PPMacroExpansion.cpp
@@ -818,6 +818,7 @@
.Case("objc_instancetype", LangOpts.ObjC2)
.Case("objc_modules", LangOpts.ObjC2 && LangOpts.Modules)
.Case("objc_nonfragile_abi", LangOpts.ObjCRuntime.isNonFragile())
+ .Case("objc_property_explicit_atomic", true) // Does clang support explicit "atomic" keyword?
.Case("objc_weak_class", LangOpts.ObjCRuntime.hasWeakClassImport())
.Case("ownership_holds", true)
.Case("ownership_returns", true)
