a compiling question

neily · 09-24-2006, 04:54 PM

I tried to use <openssl/evp.h> and included it in the program, but when compiling it, I got the information like this:
In function main, undefined reference to 'EVP_CIPHER_CTX_init'....
I saw openssl library folder exsiting in /lib/ and have all the .h file in it, but why can't the program reference to them? how can I solve this?
Waiting to your reply and thank you so much!

demon_vox · 09-24-2006, 05:13 PM

Hi,
I havent used that library, but the error you are getting is not from the compiler, but from the linkers (sutil difference I know).
What you are missing is telling the GCC which library he has to link to. So you need to find out what is it called and then add the -lLIBRARYNAME to your compile/link line.

I hope this is useful.
Cheers!

Flesym · 09-25-2006, 04:45 AM

As 'demon_vox' said, you have to link against the proper library. In this case it is most likely libssl.*. So compile with the flag: -lssl

neily · 10-05-2006, 04:20 PM

Thank you very much, demon_vox, Flesym. It does work!