================
@@ -0,0 +1,5 @@
+// RUN: %clang_cc1 -std=c23 -fsyntax-only -verify %s
+// RUN: not %clang_cc1 -std=c99 -pedantic -fsyntax-only %s 2>&1 | FileCheck
-check-prefix=CHECK-EXT %s
+
+_Alignas(int) struct c1; // expected-warning {{attribute '_Alignas' before
"struct" is ignored}}
+alignas(int) struct c1; // expected-warning {{attribute 'alignas' before
"struct" is ignored}}
----------------
jerinphilip wrote:
I tried to add a C23 test carrying over [D141177
(comment)](https://reviews.llvm.org/D141177#4606499_). The C23 test fails at
the moment, because a CXX11 path is activated. My understanding is `alignas`
being present pre C23 only in C++ has parse-paths that take the only C++
existence into consideration (from
[isCXX11AttributeSpecifier](https://github.com/llvm/llvm-project/blob/041a786c78fbcee3537ca636bf796bb18fb6f313/clang/lib/Parse/ParseTentative.cpp#L740)).
It ends up at
https://github.com/llvm/llvm-project/blob/041a786c78fbcee3537ca636bf796bb18fb6f313/clang/include/clang/Parse/Parser.h#L2743
triggering the error messages to move it outward:
https://github.com/llvm/llvm-project/blob/041a786c78fbcee3537ca636bf796bb18fb6f313/clang/lib/Parse/ParseDecl.cpp#L1791
Is it possible to decouple C23 from this what this PR addresses?
https://github.com/llvm/llvm-project/pull/65638
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