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, 14 insertions, 12 deletions

diff --git a/lib/libcxx/src/print.cpp b/lib/libcxx/src/print.cpp
index 3d8a4c291e..8fa59fdd09 100644
--- a/lib/libcxx/src/print.cpp
+++ b/lib/libcxx/src/print.cpp
@@ -7,23 +7,27 @@
 //===----------------------------------------------------------------------===//
 
 #include <__config>
+
 #include <cstdlib>
 #include <print>
 
+#include <__system_error/system_error.h>
+
+#include "filesystem/error.h"
+
 #if defined(_LIBCPP_WIN32API)
 #  define WIN32_LEAN_AND_MEAN
 #  define NOMINMAX
 #  include <io.h>
 #  include <windows.h>
-
-#  include <__system_error/system_error.h>
-
-#  include "filesystem/error.h"
+#elif __has_include(<unistd.h>)
+#  include <unistd.h>
 #endif
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#ifdef _WIN32
+#if defined(_LIBCPP_WIN32API)
+
 _LIBCPP_EXPORTED_FROM_ABI bool __is_windows_terminal(FILE* __stream) {
   // Note the Standard does this in one call, but it's unclear whether
   // an invalid handle is allowed when calling GetConsoleMode.
@@ -47,16 +51,14 @@ __write_to_windows_console([[maybe_unused]] FILE* __stream, [[maybe_unused]] wst
                     __view.size(),
                     nullptr,
                     nullptr) == 0) {
-#    ifndef _LIBCPP_HAS_NO_EXCEPTIONS
-    // There is no __throw_system_error overload that takes an error code.
-    throw system_error{filesystem::detail::make_windows_error(GetLastError()), "failed to write formatted output"};
-#    else  // _LIBCPP_HAS_NO_EXCEPTIONS
-    std::abort();
-#    endif // _LIBCPP_HAS_NO_EXCEPTIONS
+    __throw_system_error(filesystem::detail::make_windows_error(GetLastError()), "failed to write formatted output");
   }
 }
 #  endif // _LIBCPP_HAS_NO_WIDE_CHARACTERS
 
-#endif // _WIN32
+#elif __has_include(<unistd.h>) // !_LIBCPP_WIN32API
+
+_LIBCPP_EXPORTED_FROM_ABI bool __is_posix_terminal(FILE* __stream) { return isatty(fileno(__stream)); }
+#endif
 
 _LIBCPP_END_NAMESPACE_STD