Standardized Equivalent to __declspec(dllexport)?

Message

wswartzendruber · Post by **wswartzendruber** » Tue Oct 14, 2008 7:12 pm

I'm looking for a standardized way to achieve the results of __declspec(dllexport) with GCC on a POSIX environment.

Genone · Post by **Genone** » Tue Oct 14, 2008 8:08 pm

There is no need for such a construct, see http://www.groupsrv.com/linux/about71257.html for details.

Eckos · Post by **Eckos** » Tue Oct 14, 2008 9:42 pm

I have something like this in my code

#ifdef Q_CC_MSVC
#ifdef BUILD_DLL
#define DECL_EXPORT __declspec(dllexport)
#else
#define DECL_EXPORT __declspec(dllimport)
#endif
#elif Q_CC_UNIX
#define DECL_EXPORT
#endif

Post by Hu » Wed Oct 15, 2008 12:43 am

Any global scope variable with default visibility should be exported when a shared object is built. If you build with hidden visibility as a global setting, which you should do, then use __attribute__((visibility("default"))) to mark the symbol as having exported visibility. You may also be interesting in reading How To Write Shared Libraries by Ulrich Drepper.