lex:如何覆盖YY_BUF_SIZE [英] lex : How to override YY_BUF_SIZE

问题描述

根据手册 YY_BUF_SIZE是16K，我们需要覆盖它.但是，该手册未指定如何覆盖它，也无法为此找到任何命令行选项.有人可以指出如何更改此设置吗?在生成的源中，YY_BUF_SIZE的定义如下:

According to the manual YY_BUF_SIZE is 16K and we need to override it. However, the manual does not specify how to override it, nor could I find any command line option for this. Can someone please indicate how to change this. In the generated source YY_BUF_SIZE is defined as follows:

#ifndef YY_BUF_SIZE
#define YY_BUF_SIZE 16384
#endif

所以在此之前可能有一种方法可以覆盖它.

so there may be a way to override it before this.

推荐答案

在您自己的代码中，只需将YY_BUF_SIZE定义为所需的任何值即可.只要您编译代码以使编译器首先看到您的定义，#ifndef防护将阻止设置默认值.

In your own code, simply #define YY_BUF_SIZE to whatever value you want. As long as you compile your code so the compiler sees your definition first, the #ifndef guard will prevent the default value from being set.

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