Vendor import of clang trunk r178860:

http://llvm.org/svn/llvm-project/cfe/trunk@178860

1 files changed, 20 insertions, 0 deletions

diff --git a/test/Preprocessor/feature_tests.c b/test/Preprocessor/feature_tests.c
index b78a251..19d8046 100644
--- a/test/Preprocessor/feature_tests.c
+++ b/test/Preprocessor/feature_tests.c
@@ -32,3 +32,23 @@
     __has_builtin(__builtin_altivec_abs_v4sf)
 #error Broken handling of target-specific builtins
 #endif
+
+// Macro expansion does not occur in the parameter to __has_builtin,
+// __has_feature, etc. (as is also expected behaviour for ordinary
+// macros), so the following should not expand:
+
+#define MY_ALIAS_BUILTIN __c11_atomic_init
+#define MY_ALIAS_FEATURE attribute_overloadable
+
+#if __has_builtin(MY_ALIAS_BUILTIN) || __has_feature(MY_ALIAS_FEATURE)
+#error Alias expansion not allowed
+#endif
+
+// But deferring should expand:
+
+#define HAS_BUILTIN(X) __has_builtin(X)
+#define HAS_FEATURE(X) __has_feature(X)
+
+#if !HAS_BUILTIN(MY_ALIAS_BUILTIN) || !HAS_FEATURE(MY_ALIAS_FEATURE)
+#error Expansion should have occurred
+#endif