Question

I’ve tried more and more time, but I got the same error.
When I use an external lib, for example I’m try to work on openssl and crypto++, I receive the error: “undefined reference to (function)”.

I dunno why Eclipse do that neverthless the #include are all correct.
I’ve tried even to add the path from Properties-C/C++ General-Path & Symbols but nothing.

Can anybody help me?

Answer 1

You must specify the name of the shared libraries which must be linked to the executable.

Assuming you are using the GNU toolchain, you can do it by following these steps:

1. Right-click on the project, then select Properties
2. Go under C/C++ Build -> Settings
3. Select GCC C Linker -> Libraries
4. In Libraries (-l), add the name of your libraries,
5. If needed, put the directory where your libraries are hosted in Library search path (-L).