compiler-errors - `yyerror'的多重定义

Question

使用 Bison(或 yacc)我如何解决错误

 multiple definition of `yyerror'

我试过 %option noyywrap nodefault yylineno并在顶部编写原型(prototype)。没运气。

-编辑-

没关系。当我复制粘贴一个示例以使用时，我没有意识到我已经有一个 yyerror 函数。

Answer 1

您需要以下 ld(1)选项:

    -y symbol
   --trace-symbol=symbol
       Print the name of each linked file in which symbol  appears.   This
       option  may  be  given  any number of times.  On many systems it is
       necessary to prepend an underscore.

您可以通过 cc(1) 提供此信息前端通过 -Wl,option

   -Wl,option
       Pass option as an option to the linker.  If option contains commas,
       it is split into multiple options at the commas.

所以， cc -Wl,--trace-symbol=yyerror ...