shared libs for OSX

[Martin Nowak via Digitalmars-d]

On Monday, 25 May 2015 at 19:40:52 UTC, bitwise wrote:
> 1) _dyld_register_func_for_add_image should be taken care of 
> with the above two fixes

You still cannot unregister the callback, so it can't be used for 
dynamically loading druntime. Last time we talked about this 
problem, we found some undocumented function that could be 
deregistered.

> 2) __attribute__((constructor/destructor)) can be added to 
> druntime when building for osx like in the file dylib_fixes.c 
> [1]

For linux we let the compiler emit comdat constructors into every 
D object, so you'll end up with exactly a single function for any 
binary containing D code.
I don't think you need ctors/dtors on OSX if you already have the 
dylib callback.

> 3) copy paste rt_init/rt_term, rename them to 
> dylib_init/dylib_term and remove everything except whats needed 
> to initialize a shared lib's image.

Not sure what you want to copy, but for sure you need to extend 
sections_osx to handle multiple dylibs. It should be very similar 
to _d_dso_registry for ELF, except that you iterate over the 
sections of a dylib image to get EH tables and ModuleInfo.