[clang] Add option -fstdlib-hardening= (PR #78763)

[Jonathan Wakely via cfe-commits]

jwakely wrote:


> Also, @jwakely it would be nice if this worked with libstdc++ as well in the future -- it would probably turn on checks like `__GLIBCXX_ASSERT__`.

That should be `_GLIBCXX_ASSERTIONS`

No other thoughts for now. GCC has `-fhardened` now, which already defines that macro. This seems kinda redundant with it.


https://github.com/llvm/llvm-project/pull/78763