如何将Yacc / Bison-Parser包含到自己的项目中？

Question

I'd like to use the yacc/bison parser for my own project. When building the Parser with my own Makefile, everything works fine. I took the sources from http://ymorin.is-a-geek.org/projects/kconfig-frontends (just the parser that's: /<path-to-kconfig>/libs/parser .

Now when including these files into the C++ project in Eclipse, after hitting make, the compiler crashes at the .y file, because of a syntax error - wasn't able to read the .y - syntax. So I excluded the parser from the building process.

In the answer of Yacc and Lex inclusion confusion , I've read that only the .h files have to be included, to use the functions of the parser.

So what I did is:

• To get access to the parser sources out of my project, I created a simple function that just prints a line on the console in yconf.y and yconf.c: void testout(char *txt) {printf(txt);}
• I even created a yconf.h with the function-head void testout(char *txt);
• compiled the parser with my own makefile

• the main, where I'd like to call the function looks like:

   #include "y.tab.h" #include "yconf.h" #include <stdio.h> extern "C"{ int main(int argc, char *argv[]) { char configIn[] = "test"; printf(configIn); testout(configIn); return 0; } } 

The error

And now when compiling, an error appears: undefined reference to 'testout(char*)' . But Eclipse itself can resolve the function - when clicking that function, the yconf.h opens. And that's why I don't know where exactly the problem is.

Eclipse Settings:

In /project/properties/C/C++ Build/Settings I put the same include paths to the parser-sources for gcc and g++ and the linker. Additionally I added in this settings as "Include files" the y.tab.h and the yconf.h

If more information are needed, please ask.

I appreciate any advises about how to solve this problem. Thanks for the support

Kind Regards

Answer 1

Okay one really just need the y.tab.h and y.tab.c . That is created with this makefile:

lex ./lconf.l
bison -d -y ./yconf.y

My error was: I was programming in C++ and I had the extern "C" command at the wrong place, that header file needs to be declared as c format. Here's the right code:

extern "C"{
    #include "y.tab.h"
}

int main(int argc, char *argv[])
{

    char configIn[] = "test";  
    testout(configIn);
    return 0;
}

(testout is a function in y.tab.h/c with a simple printf of the parameter configIn - when executing "test" was printed.)

BTW: I excluded all source files of the parser for compilation but of the y.tab.c