Question

I am writing a program that is meant to be extended by some function definitions. One of the way of compiling the program is to create a single executable linking your code to the main code. The problem is: one of the function to define is optional and I need to test for that.

On Linux, here is what I am doing:

Compile the program with the ‘-rdynamic’ option to g++ or ‘–export-dynamic’ option to ld. Then, Use ldsym like this:

fct_type myfct = (fct_type)dlsym(RTLD_DEFAULT, 'fct'); 

If the function ‘fct’ exists in the program, this will return its address, otherwise, it returns NULL.

Now, on Windows, I am supposed to be able to do so:

dll_handle = GetModuleHandle(0); fct_type myfct = (fct_type)GetProcAddress(dll_handle, 'fct'); 

But there is no ‘-rdynamic’ or ‘–export-dynamic’ option to g++ on MinGW32! So this doesn’t work. Does anybody knows what to do on windows with MinGW32 ?

Answer 1

Ok, so in the end, I will answer my own question …

You have to link with the flag -Wl,--export-all-symbols and it works …