Undefined reference gcc

Question

When I try to compile my program on ubuntu using gcc, i get these errors:

main.c:(.text+0x162): undefined reference to json_parse' main.c:(.text+0x182): undefined reference tojson_value_free'

However, these functions are included in a file called json.h, which I import in main.c and which I include in my gcc command.

Anyone got a clue?

score 8 · Accepted Answer · 2012-06-27 18:59:03Z

8

You should not compile the "json.h" header. The undefined reference is not a compiler error, it's a linker error. It means you have either not compiled the file containing json_value_free to your code, or haven't linked to the library containing it. You should do either action instead of trying to compile the header file itself.

So, if you have a separate json.c file, you have to compile and link it also to your main.c file. Try (I assume GCC):

gcc -o myprog main.c json.c

edited Jun 27, 2012 at 18:59

answered Jun 27, 2012 at 18:51

user529758

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3 Comments

Thomas K Over a year ago

Sorry, I think I didn't make myself clear: I'm trying to compile main.c. The thing is, that the json.h file is not in a library. It's just an .h (and .c) file that I import and include..

user529758 Over a year ago

I understand. See my further explanation.

Thomas K Over a year ago

That's it! Thanks! (Can and will accept your answer in four minutes)

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