[libcxx-commits] [libcxx] [libc++][string] Remove potential non-trailing 0-length array (PR #105865)

[Nikolas Klauser via libcxx-commits]

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@@ -748,6 +748,41 @@ struct __can_be_converted_to_string_view
 struct __uninitialized_size_tag {};
 struct __init_with_sentinel_tag {};
 
+#ifdef _LIBCPP_ABI_ALTERNATE_STRING_LAYOUT
+template <class _CharT, size_t __min_cap, size_t _Padding = sizeof(_CharT) - 1>
+struct __short_impl {
+  _CharT __data_[__min_cap];
+  unsigned char __padding_[_Padding];
+  unsigned char __size_    : 7;
+  unsigned char __is_long_ : 1;
+};
+
+template <class _CharT, size_t __min_cap>
+struct __short_impl<_CharT, __min_cap, 0> {
+  _CharT __data_[__min_cap];
+  unsigned char __size_    : 7;
+  unsigned char __is_long_ : 1;
+};
+#else
+template <class _CharT, size_t __min_cap, size_t _Padding = sizeof(_CharT) - 1>
+struct __short_impl {
+  struct _LIBCPP_PACKED {
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philnik777 wrote:

Yes, it's intended. It's required to keep the ABI on AIX stable.

https://github.com/llvm/llvm-project/pull/105865