Explicitly exporting shared library functions in Linux

Question

Is there a Linux equivalent of __declspec(dllexport) notation for explicitly exporting a function from a shared library? For some reason with the toolchain I'm using, functions that aren't class members don't appear in the resulting shared library file.

Answer 1

__attribute__((visibility("default"))) 

And there is no equivalent of __declspec(dllimport) to my knowledge.

#if defined(_MSC_VER)     //  Microsoft      #define EXPORT __declspec(dllexport)     #define IMPORT __declspec(dllimport) #elif defined(__GNUC__)     //  GCC     #define EXPORT __attribute__((visibility("default")))     #define IMPORT #else     //  do nothing and hope for the best?     #define EXPORT     #define IMPORT     #pragma warning Unknown dynamic link import/export semantics. #endif 

Typical usage is to define a symbol like MY_LIB_PUBLIC conditionally define it as either EXPORT or IMPORT, based on if the library is currently being compiled or not:

#if MY_LIB_COMPILING #   define MY_LIB_PUBLIC EXPORT #else #   define MY_LIB_PUBLIC IMPORT #endif 

To use this, you mark your functions and classes like this:

MY_LIB_PUBLIC void foo();  class MY_LIB_PUBLIC some_type {     // ... };