c++ - How to use OpenSSL with GCC?

Question

I'm trying to use openssl in a gcc program but it isn't working.

g++ server.cpp /usr/lib/libssl.a -o server

gives an error message, as does anything with the -l option. What must I type on the command line to link with openssl? The file /usr/lib/libssl.a exists, but nevertheless I still get the linker error no such function MD5() exists.

Answer 1

Without knowing the exact errors you are seeing, it is difficult to provide an exact solution. Here is my best attempt.

From the information you provided, it sounds as though the linker is failing because it cannot find a reference to the md5 function in libssl.a. I believe this function is actually in libcrypto so you may need to specify this library as well.

g++ server.cpp -L/usr/lib -lssl -lcrypto -o server