================
@@ -0,0 +1,25 @@
+// RUN: %clang_cc1 %s -fsyntax-only -verify=expected,cpp
+// RUN: %clang_cc1 -x c %s -fsyntax-only -verify=expected,c
+
+// Ensure that we correctly parse _Alignas as an extension in C++.
+_Alignas(64) int i1;
+_Alignas(long long) int i2;
+int volatile _Alignas(64) i3; // Test strange ordering
+
+void foo(void) {
+ // We previously rejected these valid declarations.
+ _Alignas(8) char i4;
+ _Alignas(char) char i5;
+
+ (void)(int _Alignas(64))0; // expected-warning {{'_Alignas' attribute
ignored when parsing type}}
+ // FIXME: C and C++ should both diagnose the same way, as being ignored.
----------------
AaronBallman wrote:
Note: I plan to fix this in a follow-up
https://github.com/llvm/llvm-project/pull/81915
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