为啥写的代码一样，而运行后成这个？
运行失败
/usr/lib/gcc/x86_64-alpine-linux-musl/6.3.0/../../../../lib/Scrt1.o: In function `_start_c': /home/buildozer/aports/main/musl/src/musl-1.1.16/crt/crt1.c:17: undefined reference to `main' /usr/lib/gcc/x86_64-alpine-linux-musl/6.3.0/../../../../x86_64-alpine-linux-musl/bin/ld: final link failed: No space left on device collect2: error: ld returned 1 exit status
