Undefined reference : very strange linking problem...

Undefined reference : very strange linking problem...

[Sébastien ZINSIUS]

Hello all!

I have a very strange linking problem... I'm working on a quite complex project written in C++ and compiled/linked with g++.

This project includes a lot of libraries. I recently added 3 new classes (one base class and two classes inheriting the first) to the A library. This library is used by library B. Finally, application is linked with both libraries.

Everything worked sofar but this times I got strange undefined references when linking (only with the two classes inheriting the third, but I don't know if it is related). I checked header files (#ifdef, class names, method names...), libraries linking order (but that always worked...) and everything is OK. Compilation also succeeds and when I use classes directly (not through libraries) or when I use them through library A it works!!

That's why I suspect something with library B. It seems that there is an overflow somewhere (to many symbols defined in library)... Is this possible? Is there any solution? Any other idea?

Thanks in anticipation!

Sébastien

Re: Undefined reference : very strange linking problem...

[Eljay Love-Jensen]

Hi Sebastien,

Could be a "too many symbols" overflow.

Could be an interdependency between library A and B (usually "a bad thing").

Try this:

g++ -o foo myapp.o libA.a libB.a libA.a

That will help if there are library interdependencies.

HTH,
--Eljay