Use the following flags for linking

-static -static-libgcc -static-libstdc++

Use these three flags to link against the static versions of all dependencies (assuming gcc). Note, that in certain situation you don’t necessarily need all three flags, but they don’t “hurt” either. Therefore just turn on all three.

Check if it actually worked

1. Make sure that there is really no dynamic linkage

   ldd yourexecutable
   

   should return “not a dynamic executable” or something equivalent.

2. Make sure that there are no unresolved symbols left

   nm yourexecutable | grep " U "
   

   The list should be empty or should contain only some special kernel-space symbols like

   U __tls_get_addr
   

3. Finally, check if you can actually execute your executable