其实 c11 标准里面就有写了,但似乎 gcc 不支持. 有了这个功能可以搞些很奇怪的东西,例如 C in Chinese: https://github.com/thefangbear/yiic 测试了下,clang 支持的很好.
参考: 1 - gcc wiki : GCC only supports UCNs but not Unicode macro names: https://gcc.gnu.org/PR67224
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