[PATCH] D119230: [clang] Add test for C++ DR2390

[Timm Bäder via Phabricator via cfe-commits]

tbaeder created this revision.
tbaeder added a reviewer: aaron.ballman.
tbaeder requested review of this revision.
Herald added a project: clang.
Herald added a subscriber: cfe-commits.

DR2390 clarifies that the argument to `__has_cpp_attribute()` needs to be
macro-expanded. Clang already supports this and tests it explicitly in
`clang/test/Preprocessor/has_attribute.cpp`.

Copy the test over to `clang/test/CXX/drs/` so the `make_cxx_drs` script
picks it up.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D119230

Files:
  clang/test/CXX/drs/dr2390.cpp


Index: clang/test/CXX/drs/dr2390.cpp
===================================================================
--- /dev/null
+++ clang/test/CXX/drs/dr2390.cpp
@@ -0,0 +1,47 @@
+// RUN: %clang_cc1 -E -P %s -o - | FileCheck %s
+
+// dr2390: yes
+
+namespace PR48462 {
+// Test that macro expansion of the builtin argument works.
+#define C clang
+#define F fallthrough
+#define CF clang::fallthrough
+
+#if __has_cpp_attribute(F)
+int has_fallthrough;
+#endif
+// CHECK: int has_fallthrough;
+
+#if __has_cpp_attribute(C::F)
+int has_clang_fallthrough_1;
+#endif
+// CHECK: int has_clang_fallthrough_1;
+
+#if __has_cpp_attribute(clang::F)
+int has_clang_fallthrough_2;
+#endif
+// CHECK: int has_clang_fallthrough_2;
+
+#if __has_cpp_attribute(C::fallthrough)
+int has_clang_fallthrough_3;
+#endif
+// CHECK: int has_clang_fallthrough_3;
+
+#if __has_cpp_attribute(CF)
+int has_clang_fallthrough_4;
+#endif
+// CHECK: int has_clang_fallthrough_4;
+
+#define FUNCLIKE1(x) clang::x
+#if __has_cpp_attribute(FUNCLIKE1(fallthrough))
+int funclike_1;
+#endif
+// CHECK: int funclike_1;
+
+#define FUNCLIKE2(x) _Clang::x
+#if __has_cpp_attribute(FUNCLIKE2(fallthrough))
+int funclike_2;
+#endif
+// CHECK: int funclike_2;
+} // namespace PR48462


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