[SOLVED] How to compile code using `__declspec(dllexport)` for Linux

Issue

There are a few questions out there about __declspec(dllexport), but none seem to fit my use case:

1. Source code was originally written for Windows and uses __declspec(dllexport).
2. Would like to recompile for a Linux target without modifying the source.

I am trying to use GCC 11.4, which mentions:

You can use __declspec(dllexport) as a synonym for __attribute__ ((dllexport)) for compatibility with other compilers.

I can't seem to get this to work, however.

error: expected constructor, destructor, or type conversion before ‘(’ token
    8 | #define dll_export __declspec(dllexport)

error: ‘dllexport’ was not declared in this scope
   23 | void __declspec(dllexport) _Err_msg(int err, char*& msg);

Hoping that there are some magic GCC flags that I am missing, or another kind of non-invasive shim I could use to get this to compile for Linux. Any help appreciated!

Solution

How about -D option?

-D name=definition

The contents of definition are tokenized and processed as if they appeared during translation phase three in a ‘#define’ directive. In particular, the definition is truncated by embedded newline characters.

gcc -D__declspec(dllexport)=__attribute__((dllexport)) ...

Similar for other Windows specific stuff

Answered By - Severin Pappadeux

Answer Checked By - Cary Denson (WPSolving Admin)