Disallow use of __has_c_attribute in C++ mode.
__has_cpp_attribute is not available in C mode, and __has_c_attribute
should not be available in C++ mode. This also adds a test to
demonstrate that we properly handle scoped attribute tokens even in C
mode.
diff --git a/clang/test/Preprocessor/has_c_attribute.c b/clang/test/Preprocessor/has_c_attribute.c
index 843a67a..f8b0b36 100644
--- a/clang/test/Preprocessor/has_c_attribute.c
+++ b/clang/test/Preprocessor/has_c_attribute.c
@@ -1,4 +1,5 @@
// RUN: %clang_cc1 -fdouble-square-bracket-attributes -std=c11 -E %s -o - | FileCheck %s
+// RUN: %clang_cc1 -std=c2x -E %s -o - | FileCheck %s
// CHECK: has_fallthrough
#if __has_c_attribute(fallthrough)
@@ -14,3 +15,8 @@
#if __has_c_attribute(__nodiscard__)
int has_nodiscard_underscore();
#endif
+
+// CHECK: has_clang_annotate
+#if __has_c_attribute(clang::annotate)
+ int has_clang_annotate();
+#endif
