How to cross compile and link any library?

Hello,

I have a question regarding cross compiling the libraries. In my case, I'm trying to cross compile a library for Raspberry Pi2 model B from my host (Lubuntu x64). Therefore, I followed that tutorial successfully: cross compiling for raspberry. Also, I did remote debugging successfully.

However, when I tried to cross compile a simple application that is tried already running on raspberry, it is NOT successful. The application uses the "pigpio" library and "pthread". The given error indicates (as I think) is related to linking the pigpio. The error is: recipe for target 'CC_threading_mod_m3' failed makefile.

By revising a lab of Free-Electrons Free-Electrons lab for cross-compiling libraries that give libraries cross-compilation examples, I believe that I need to cross-compile the pigpio first, then link the generated binary to Eclipse project. However, because I am new to such an environment (cross compilation & raspberry & Eclipse & external library); I don't know HOW-TO DO ?

Further, the Free-Electrons lab mentions compiler flags & options... which brings up another question: HOW can I apply similar options for my cross-compiler which will be called by Eclipse?


Thank you.

Those are pretty extensive instructions. I do wonder if there's a good intermediate point where you can not do all the Eclipse stuff and just compile at the command line and get something successfully working.

The ideas here are:

1. You install a compiler which is capable of creating binaries which match the target "other" machine
2. You also have local libraries suitable for the target which you can link with to satisfy your needs for linking, but ultimately these libraries need to be installed on the target in a known location for libraries as the toolkit specifies and/or assists you doing
3. As I've said earlier, you should be able after proper install to just do a command line compilation which works. If you can't do that, then there's something wrong, either the cross compilation tools are wrong or not properly installed, or the configuration about where to look for libraries on the target is wrong

Can you just do a simple command line compilation and then see what it shows on the target when you try to run it?