Linking Math Library in GCC 4.6.1 (Ubuntu 11.10)

Question

I find a problem in the linking process of my application. I did not have the same with gcc 4.5. It tries to link math library with the following command.

gcc -W         


        

Answer 1

You didn't tell us what -lmems_internals is, but maybe the unresolved symbol comes from there. The order of the -l options is generally important to the linker, you should always put system libraries last.

You can check where the unresolved symbol comes from by using something like

nm yourLibrary | grep sqrt

if there is a U in front of sqrt the symbol is undefined.