"_main", referenced from:
start in crt1.10.6.o
"_yywrap", referenced from:
_yylex in ccY7a1Un.o
_input in ccY7a1Un.o
ld: symbol(s) not found for architecture x86_64
collect2: ld returned 1 exit status
这是我以 %% 形式运行简单 lex 程序时遇到的错误。相同的程序在其他地方运行良好。