Homebrew Clang找不到C标准库标题

毫不奇怪,OSX Mojave的新更新破坏了我在自制程序中的LLVM安装,以下是我尝试的步骤:

xcode-select --install # Complained, so I installed commandLineTools from here https://developer.apple.com/download/more/
xcode-select -p /Library/Developer/CommandLineTools
xcode-select --install # Now says installed
sudo xcodebuild -license # Fails, as it says I only have CommandLineTools installed in /Library/Developer/CommandLineTools not xcode

# Try something else (all versions)
brew uninstall --force llvm
brew install llvm # yay v7 how exciting

# Only it still don't work
clang++ -std=c++17 foo.cpp -o f
In file included from foo.cpp:1:
In file included from /usr/local/Cellar/llvm/7.0.0/include/c++/v1/iostream:38:
In file included from /usr/local/Cellar/llvm/7.0.0/include/c++/v1/ios:215:
In file included from /usr/local/Cellar/llvm/7.0.0/include/c++/v1/iosfwd:90:
/usr/local/Cellar/llvm/7.0.0/include/c++/v1/wchar.h:119:15: fatal error: 'wchar.h' file not found
#include_next <wchar.h>
              ^~~~~~~~~
1 error generated.

有什么想法吗?前半部分我在网上找到的东西,但主要是为了更新macos,也许mojave以一种新的、不可预测的方式打破了一些东西。