libcxx: update to LLVM 18

release/18.x branch, commit 78b99c73ee4b96fe9ce0e294d4632326afb2db42

This adds the flag `-D_LIBCPP_HARDENING_MODE` which is determined based
on the Zig optimization mode.

This commit also fixes libunwind, libcxx, and libcxxabi to properly
report sub compilation errors.

1 files changed, 8 insertions, 8 deletions

diff --git a/lib/libcxx/include/__variant/monostate.h b/lib/libcxx/include/__variant/monostate.h
index 8fec34008f..16f156609e 100644
--- a/lib/libcxx/include/__variant/monostate.h
+++ b/lib/libcxx/include/__variant/monostate.h
@@ -25,32 +25,32 @@ _LIBCPP_BEGIN_NAMESPACE_STD
 
 struct _LIBCPP_TEMPLATE_VIS monostate {};
 
-_LIBCPP_HIDE_FROM_ABI constexpr bool operator==(monostate, monostate) noexcept { return true; }
+_LIBCPP_HIDE_FROM_ABI inline constexpr bool operator==(monostate, monostate) noexcept { return true; }
 
 #  if _LIBCPP_STD_VER >= 20
 
-_LIBCPP_HIDE_FROM_ABI constexpr strong_ordering operator<=>(monostate, monostate) noexcept {
+_LIBCPP_HIDE_FROM_ABI inline constexpr strong_ordering operator<=>(monostate, monostate) noexcept {
   return strong_ordering::equal;
 }
 
 #  else // _LIBCPP_STD_VER >= 20
 
-_LIBCPP_HIDE_FROM_ABI constexpr bool operator!=(monostate, monostate) noexcept { return false; }
+_LIBCPP_HIDE_FROM_ABI inline constexpr bool operator!=(monostate, monostate) noexcept { return false; }
 
-_LIBCPP_HIDE_FROM_ABI constexpr bool operator<(monostate, monostate) noexcept { return false; }
+_LIBCPP_HIDE_FROM_ABI inline constexpr bool operator<(monostate, monostate) noexcept { return false; }
 
-_LIBCPP_HIDE_FROM_ABI constexpr bool operator>(monostate, monostate) noexcept { return false; }
+_LIBCPP_HIDE_FROM_ABI inline constexpr bool operator>(monostate, monostate) noexcept { return false; }
 
-_LIBCPP_HIDE_FROM_ABI constexpr bool operator<=(monostate, monostate) noexcept { return true; }
+_LIBCPP_HIDE_FROM_ABI inline constexpr bool operator<=(monostate, monostate) noexcept { return true; }
 
-_LIBCPP_HIDE_FROM_ABI constexpr bool operator>=(monostate, monostate) noexcept { return true; }
+_LIBCPP_HIDE_FROM_ABI inline constexpr bool operator>=(monostate, monostate) noexcept { return true; }
 
 #  endif // _LIBCPP_STD_VER >= 20
 
 template <>
 struct _LIBCPP_TEMPLATE_VIS hash<monostate> {
   using argument_type = monostate;
-  using result_type = size_t;
+  using result_type   = size_t;
 
   inline _LIBCPP_HIDE_FROM_ABI result_type operator()(const argument_type&) const _NOEXCEPT {
     return 66740831; // return a fundamentally attractive random value.