在C中编译ANTLR 3语法 [英] Compiling an ANTLR 3 grammar in C

问题描述

我一直在努力学习ANTLR，并使用这个教程（也在这个问题）。我成功地让ANTLR生成词法分析器和解析器作为C源代码，但是我无法让它们在Mac OS X Snow Leopard（i686-apple-darwin10-gcc-4.2.1）上使用gcc进行编译。下面是我尝试编译SimpleCalcLexer.c时的结果。

I've been trying to learn ANTLR and get it working with C output code using this tutorial (also referenced in this question). I successfully got ANTLR to generate the lexer and parser as C source, but I cannot get them to compile using gcc on Mac OS X Snow Leopard (i686-apple-darwin10-gcc-4.2.1). Below is the result when I try to compile the "SimpleCalcLexer.c".

dyn-72-33-132-199:Desktop bf$ gcc -o lexer SimpleCalcLexer.c
Undefined symbols:
  "_main", referenced from:
      start in crt1.10.6.o
  "_antlr3LexerNewStream", referenced from:
      _SimpleCalcLexerNewSSD in ccjXa6NU.o
ld: symbol(s) not found
collect2: ld returned 1 exit status

SimpleCalcLexer.c文件没有在任何地方引用main（也没有定义），但解析器确实定义了它，所以我试图编译它：

The SimpleCalcLexer.c file does not reference "main" anywhere (nor is it defined), but the parser does define it, so I tried to compile that:

dyn-72-33-132-199:Desktop bf$ gcc -o parser SimpleCalcParser.c
Undefined symbols:
  "_antlr3CommonTokenStreamSourceNew", referenced from:
      _main in ccn8ZVhk.o
  "_antlr3ParserNewStream", referenced from:
      _SimpleCalcParserNewSSD in ccn8ZVhk.o
  "_SimpleCalcLexerNew", referenced from:
      _main in ccn8ZVhk.o
  "_antlr3AsciiFileStreamNew", referenced from:
      _main in ccn8ZVhk.o
ld: symbol(s) not found
collect2: ld returned 1 exit status

所以几个问题：

1）我在做什么错了？我很确定这些库已经找到，因为在代码中还有其他antlr函数和定义。我是否错误地调用gcc？ （我从来没有在命令行上编译过任何复杂的命令）。

2）什么是 ccn8ZVhk.o ？我可以告诉它它是一个目标代码文件，但我在我的系统上找不到它（ locate 和 mdfind ）。

So several questions:
1) What am I doing wrong? I'm pretty sure the libraries are being found, as there are other antlr functions and definitions being found in the code. Am I calling gcc incorrectly? (I've never compiled anything this complex on the commandline before.)
2) What is ccn8ZVhk.o? I can tell that it is an object code file, but I can't find it on my system (both locate and mdfind).

推荐答案

您需要将词法分析器和解析器编译为相同的可执行文件;他们一起工作创建一个单一的程序。试试这个：

You need to compile the lexer and the parser into the same executable; they work together to create a single program. Try this:

gcc -o lexer SimpleCalcLexer.c SimpleCalcParser.c -lantlr3c

该命令行将编译词法分析器和解析器，然后将结果与ANTLR库（-lantlr3c部分）相链接。

That command line will compile the lexer and the parser and then link the result with the ANTLR library (the "-lantlr3c" part).

目标文件ccn8ZVhk.o是运行时库的一部分，实际上是调用main（）。它不包含用户可服务的部分。

The object file ccn8ZVhk.o is part of the runtime library and is what actually calls main(). It doesn't contain user-servicable parts.

这篇关于在C中编译ANTLR 3语法的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！