The standard library header <cstdalign> is missing

[yurivict]

Bugzilla Link	38411
Version	unspecified
OS	FreeBSD
CC	@mclow

Extended Description

I found this problem on FreeBSD, which uses clang and llvm C++ library: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=230230

cppreference says that there should be such standard header: https://en.cppreference.com/w/cpp/header/cstdalign

[yurivict]

assigned to @mclow

[mclow]

In the long run, you'll want to fix your code, because was deprecated in C++17, and will be removed outright for C++20.

c++17: [diff.mods.to.headers]/4 says:
The headers , (D.4.2), and (D.4.3) are meaningless in C++. Use of the C++ headers , , , and is deprecated (D.5).

c++2a [diff.cpp17.library]/2 says:
Change: Remove vacuous C++ header files.
Rationale: The empty headers implied a false requirement to achieve C compatibility with the C++ headers. Effect on original feature: A valid C++ 2017 program that #includes any of the following headers may fail to compile: , , , , and .

That being said, it looks like libc++ never added or for C++11.

[frederick-vs-ja]

I think this issue is essentially fixed by a linked PR.