The missing libc++ headers for Xcode9

It seems Apple only update clang compiler itself, but not about the standard library libc++. Fortunately, missing headers work well by simplly copying from REAL LLVM.

This package includes any, optional and variant.

Installing with Cocoapods

Here is an example of Podfile:

platform :osx, '10.12'

target 'MyApp' do
    pod 'libc++'
end

Installing with Makefile

Note: This is not recommended. This method will change your Xcode internal files. Note that this action might break your Xcode or system. Try it by your own risk.

# Clone this repository.
# Run `make brew` to install llvm@5 via homebrew.
# Run `make install` and follow the instruction.