I'm on AIX 5.3, working with C.
I have an application (foo) that links in a shared library (lib1.so) at run time, then dynamically loads another library (lib2.so) via dlopen(). lib2.so uses some functions in lib1.so that foo does not use. When I execute the application, I get an error similar to:
rtld: 0712-001 Symbol someLibFunc was referenced from module
/libdir/lib2.so(), but a runtime definition of the symbol was not found.
I don't believe that changing the dlopen() flags would have any effect, since my issue seems to have something to do with what symbols are imported when run-time linking occurs. Is there some type of ld option I can use when building foo to force it to import all shared library symbols? This same build works great in my Linux environment.
I found the culprit.
I ran 'dump -Tv' on lib1.so and found that the function I expected to be exported was not there (although it did show up in nm, oddly enough). The library was linked with -bexpall so all symbols should be there. I dug deeper into the ld man page and saw that expall did not export symbols prefixed with an underscore (_). The function I was trying to use began with an underscore. I found the 'expfull' ld option, which exports symbols prefixed with an underscore, rebuilt lib1.so with that option, and everything is good now.