Sharing a global/static variable between a process and DLL

Question

I\'d like to share a static/global variable only between a process and a dll that is invoked by the process. The exe and dll are in the same memory address space. I don\'t w

Answer 1

The difference between GCC and and Visual Studio is that on Linux, it implicitly allows code to see symbols from other, dynamically linked (shared) libraries, without you the programmer having to do anything special. All the symbols are available in the shared (dynamically linked) library for the dynamic linker to resolve when the program runs. On Windows, you have to specifically export the symbol from the DLL, and also explicitly import it into the program or library that's using it. (Usually this is done via a macro (#define) that expands to have the dllexport declaration in a header file when building the dll itself, but when the header file is included by some other program using the dll, it expands to have the dllimport declaration instead. In my opinion this is a pain in the neck, and GCC's behavior is easier, since you don't have to do anything special to get the behavior you usually want.

On newer version of GCC, you can set the default to hide symbols when building a dynamic (shared) library, if you want to.