How to add a symbol of function into the file .exp

[jeffwang66]

Hello,

If there are two projects A and B. A is created as .dll, while B is created as static library.

project A has a class "classA"

classA: public classB
{
public:
testA();
};

project B has a class "classB"

classB
{
public:
testB();

} ;

I want to make a symbol of classB::testB() in A.exp (like ?testB@classB@@QAEXXZ), can I do it by using __declspec(dllexport)?

Also if I make classB as a template class, can the symbol of classB::testB() be generated automatically in A.exp when building project A?

Thanks,

[Igor Vartanov]

A is created as .dll, while B is created as static library.

This is where your problem is. The specific of linking with static library is that objects get extracted from the library on the stage of linking loadable module. Only those ones that required for resolving this particular module symbols. Once the dll hosts classA but never calls classB::testB inside the code, the said classB::testB body never appears in the module, and therefore, there's no symbol ?testB@classB@@QAEXXZ to export from the dll. For the process of linking the relation of inheritance really means nothing, and linking is strictly about resolving binary symbol dependencies.

[OReubens]

The answer is already given in your previous post about this.

Either explicitely provide the testB member override in classA or make your executable dependant on the static lib as well.