粉丝不w
/usr/lib/gcc/x86_64-linux-gnu/7/../../../x86_64-linux-gnu/Scrt1.o: In function `_start':
(.text+0x20): undefined reference to `main'
collect2: error: ld returned 1 exit status
注意main是不是写错了，或者 return 写错误
一定不要粗心·，哈哈哈哈
In function `_start' undefined reference to `main' error: ld returned 1 exit status
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