Re: The best possible way to call a function in a shared library

["Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>]

On 01/10/2017 23:06, John Smith wrote:
> I've recently come across this example on rosettacode:
> http://rosettacode.org/wiki/Call_a_function_in_a_shared_library#Ada
> 
> I have a project that's building a DLL. There is a neighboring
> project file that builds an executable and needs to make use of the
> DLL. Is it possible to include the DLL in the application through the
> 2nd project file?

DLL is not included, it is loaded/linked/mapped to.

[ In order to include DLL you must extract object files from there, if 
that works, then put them into a static library and use that instead. ]

In the scenario when the DLL is to be linked to at build time and loaded 
automatically at the application start, you create two library project 
files. One is used to build the library itself. Another is to use the 
library in another project. See GNAT project files.

Essential for "build" project is

    for Library_Interface use (<units-list>);

which determines which Ada units get exported out of the library.

For the "use" project it is

    for Externally_Built use "true";

telling that the library is already built.

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de