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Apply libc++ fix for compiling <type_traits> with gcc 13

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Merge commit 484e64f7e7b2 from llvm-project (by Roland McGrath):

  [libc++] Use __is_convertible built-in when available

  https://github.com/llvm/llvm-project/issues/62396 reports that
  GCC 13 barfs on parsing <type_traits> because of the declarations
  of `struct __is_convertible`.  In GCC 13, `__is_convertible` is a
  built-in, but `__is_convertible_to` is not.  Clang has both, so
  using either should be fine.

  Reviewed By: #libc, philnik

  Differential Revision: https://reviews.llvm.org/D149313

Reported by:	Mark Millard <marklmi@yahoo.com>
MFC after:	3 days
This commit is contained in:
Dimitry Andric 2023-05-05 18:19:40 +02:00
parent 494e7dfdbe
commit 2df58f1907
1 changed files with 8 additions and 1 deletions
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9
contrib/llvm-project/libcxx/include/__type_traits/is_convertible.h
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@ -24,11 +24,18 @@
_LIBCPP_BEGIN_NAMESPACE_STD
#if __has_builtin(__is_convertible_to) && !defined(_LIBCPP_USE_IS_CONVERTIBLE_FALLBACK)
#if __has_builtin(__is_convertible) && !defined(_LIBCPP_USE_IS_CONVERTIBLE_FALLBACK)
template <class _T1, class _T2>
struct _LIBCPP_TEMPLATE_VIS is_convertible : public integral_constant<bool, __is_convertible(_T1, _T2)> {};
#elif __has_builtin(__is_convertible_to) && !defined(_LIBCPP_USE_IS_CONVERTIBLE_FALLBACK)
template <class _T1, class _T2> struct _LIBCPP_TEMPLATE_VIS is_convertible
: public integral_constant<bool, __is_convertible_to(_T1, _T2)> {};
// TODO: Remove this fallback when GCC < 13 support is no longer required.
// GCC 13 has the __is_convertible built-in.
#else // __has_builtin(__is_convertible_to) && !defined(_LIBCPP_USE_IS_CONVERTIBLE_FALLBACK)
namespace __is_convertible_imp