| // RUN: %clang_cc1 -triple i386-unknown-unknown -Eonly -verify %s |
| |
| // We warn users if they write an attribute like |
| // [[__clang__::fallthrough]] because __clang__ is a macro that expands to 1. |
| // Instead, we suggest users use [[_Clang::fallthrough]] in this situation. |
| // However, because __has_cpp_attribute (and __has_c_attribute) require |
| // expanding their argument tokens, __clang__ expands to 1 in the feature test |
| // macro as well. We don't currently give users a kind warning in this case, |
| // but we previously did not expand macros and so this would return 0. Now that |
| // we properly expand macros, users will now get an error about using incorrect |
| // syntax. |
| |
| __has_cpp_attribute(__clang__::fallthrough) // expected-error {{missing ')' after <numeric_constant>}} \ |
| // expected-note {{to match this '('}} \ |
| // expected-error {{builtin feature check macro requires a parenthesized identifier}} |
| |
