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, 5 insertions, 10 deletions

diff --git a/lib/libcxx/src/optional.cpp b/lib/libcxx/src/optional.cpp
index d0214981a2..6ba63f2d89 100644
--- a/lib/libcxx/src/optional.cpp
+++ b/lib/libcxx/src/optional.cpp
@@ -8,18 +8,15 @@
 
 #include <__availability>
 #include <optional>
+#include <stdexcept>
 
-namespace std
-{
+namespace std {
 
 bad_optional_access::~bad_optional_access() noexcept = default;
 
-const char* bad_optional_access::what() const noexcept {
-  return "bad_optional_access";
-}
-
-} // std
+const char* bad_optional_access::what() const noexcept { return "bad_optional_access"; }
 
+} // namespace std
 
 #include <experimental/__config>
 
@@ -27,9 +24,7 @@ const char* bad_optional_access::what() const noexcept {
 //  Even though it no longer exists in a header file
 _LIBCPP_BEGIN_NAMESPACE_EXPERIMENTAL
 
-class _LIBCPP_EXPORTED_FROM_ABI _LIBCPP_AVAILABILITY_BAD_OPTIONAL_ACCESS bad_optional_access
-  : public std::logic_error
-{
+class _LIBCPP_EXPORTED_FROM_ABI _LIBCPP_AVAILABILITY_BAD_OPTIONAL_ACCESS bad_optional_access : public std::logic_error {
 public:
   bad_optional_access() : std::logic_error("Bad optional Access") {}