zlib-ada and linker option

[Björn Persson]

Pavel Zhukov wrote:
> I've been testing zlib-ada with test exaples as well as with aws. I've
> to add -lz options to gprbuild manually.
> I think the best way is adding Linker_Option to zlib_ada.gpr, isn't
> it?

That's odd, you shouldn't need to do that. libzlib_ada is supposed to be 
linked to libz already, and I just verified that I can compile both AWS 
and the examples without -lz.

If a program would call functions in Zlib directly, then it would need 
to be linked with -lz, but programs (and libraries like AWS) that use 
Zlib-Ada aren't supposed to call Zlib directly. They call subprograms in 
Zlib-Ada, and those subprograms in turn call functions in Zlib. That is 
after all the whole purpose of a binding.

If you run "readelf --dynamic /usr/lib*/libzlib_ada-1.4.so.0", do you 
see a line saying "Shared library: [libz.so.1]"?

If you run "ldd /usr/lib*/libzlib_ada-1.4.so.0", does it resolve the 
link to libz.so.1 successfully?

Have you ensured that the Zlib-Ada sources aren't in any of the source 
directories? If they are, I suppose they'll get compiled in directly 
instead of being linked in as a library, and then -lz will be required. 
To link the test programs to the shared library you should first separate 
them from the sources of the library itself. For AWS you need to delete 
all the files that begin with "zlib" in the "include" directory.

Björn