-E Stop after the preprocessing stage; do not run the compiler proper.
The output is in the form of preprocessed source code, which is
sent to the standard output.
在终端 gcc -E your_source.c 检查宏展开后代码是否正确
【 在 haman2013 的大作中提到: 】
: 当__VA_ARGS__为空时，总是算不对，请大家帮忙想想有什么办法
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