[coroutines] Add feature-test macro for coroutines, defined to 1 to indicate

the implementation is incomplete.

llvm-svn: 250982

2 files changed, 7 insertions, 0 deletions

diff --git a/clang/lib/Frontend/InitPreprocessor.cpp b/clang/lib/Frontend/InitPreprocessor.cpp
index 0b445e8b65c..dc075793ac8 100644
--- a/clang/lib/Frontend/InitPreprocessor.cpp
+++ b/clang/lib/Frontend/InitPreprocessor.cpp
@@ -456,6 +456,8 @@ static void InitializeCPlusPlusFeatureTestMacros(const LangOptions &LangOpts,
     Builder.defineMacro("__cpp_sized_deallocation", "201309");
   if (LangOpts.ConceptsTS)
     Builder.defineMacro("__cpp_experimental_concepts", "1");
+  if (LangOpts.Coroutines)
+    Builder.defineMacro("__cpp_coroutines", "1");
 }
 
 static void InitializePredefinedMacros(const TargetInfo &TI,
diff --git a/clang/test/Lexer/cxx-features.cpp b/clang/test/Lexer/cxx-features.cpp
index 4ec4d55ac08..6c4a092b1c4 100644
--- a/clang/test/Lexer/cxx-features.cpp
+++ b/clang/test/Lexer/cxx-features.cpp
@@ -2,6 +2,7 @@
 // RUN: %clang_cc1 -std=c++11 -verify %s
 // RUN: %clang_cc1 -std=c++1y -fsized-deallocation -verify %s
 // RUN: %clang_cc1 -std=c++1y -fsized-deallocation -fconcepts-ts -DCONCEPTS_TS=1 -verify %s
+// RUN: %clang_cc1 -fcoroutines -DCOROUTINES -verify %s
 
 // expected-no-diagnostics
 
@@ -128,3 +129,7 @@
 #if check(experimental_concepts, 0, 0, CONCEPTS_TS)
 #error "wrong value for __cpp_experimental_concepts"
 #endif
+
+#if (COROUTINES && !__cpp_coroutines) || (!COROUTINES && __cpp_coroutines)
+#error "wrong value for __cpp_coroutines"
+#endif