During dynamic linking, a strange undefined link appears. I know the name of the library that should contain this function. Is there any linux command to make sure that the function already exists in the library (.a file)?
You can use nm(a parameter may be required --demangle) to get a list of everything that is inside the library, then use it grepto filter the results, for example. find \d T functionname\(or something like that.
nm
--demangle
grep
\d T functionname\(
Look at the team nmthat should provide you with the information you are looking for