What is the correct multi-platform way to build one dub project as a shared library, and load said shared library in a separate dub project? So far I am able to load a shared library and run a function from it (had to extern(C) it to get the symbol to load) by using "targetType":"dynamicLibrary" in the shared library project, but the main program exits with code -11 and if I don't unload the library manually I get a weird "Aborting from src/rt/sections_elf_shared.d(500) DSO being unregistered isn't current last one.Program exited with code -6" error that Google knows nothing about.

I'm trying to add a module system to DMildew because the core runtime is over 50 MB in the debug build. Libraries would be written in regular D and optionally dynamically loaded by a regular D application that links to the core static library (the DMildew runtime).

Update: the dub "dynamicLibrary" target option is busted on Windows and does not build anything at all. This should be filed as a bug.

On Tuesday, 2 March 2021 at 03:42:14 UTC, Pillager86 wrote:
> Update: the dub "dynamicLibrary" target option is busted on Windows and does not build anything at all. This should be filed as a bug.

Update again: I got the Windows DLL to build and run without crashing, but I don't know how to put specific platform options in dub. I need "dflags" "-defaultlibrary=phobos2" or something on Linux but not Windows.

On Tuesday, 2 March 2021 at 04:13:31 UTC, Pillager86 wrote:
> On Tuesday, 2 March 2021 at 03:42:14 UTC, Pillager86 wrote:
>> Update: the dub "dynamicLibrary" target option is busted on Windows and does not build anything at all. This should be filed as a bug.
>
> Update again: I got the Windows DLL to build and run without crashing, but I don't know how to put specific platform options in dub. I need "dflags" "-defaultlibrary=phobos2" or something on Linux but not Windows.

Also, what do you do if the shared library needs to refer to types in the main static library?

On Tuesday, 2 March 2021 at 04:26:52 UTC, Pillager86 wrote:
> On Tuesday, 2 March 2021 at 04:13:31 UTC, Pillager86 wrote:
>> On Tuesday, 2 March 2021 at 03:42:14 UTC, Pillager86 wrote:
>>> Update: the dub "dynamicLibrary" target option is busted on Windows and does not build anything at all. This should be filed as a bug.
>>
>> Update again: I got the Windows DLL to build and run without crashing, but I don't know how to put specific platform options in dub. I need "dflags" "-defaultlibrary=phobos2" or something on Linux but not Windows.

Try this (for dub.json)

"dflags-linux": ["-defaultlibrary=phobos2"]

For platform/architecture/compiler specific variants just add suffix like this, also works with lflags, and I guess pretty much any other options.

"dflags-linux" : ["specific flags for linux"]
"dflags-windows" : ["specific flags for windows"]
"dflags-windows-dmd" : ["more flags if building with dmd"]
"dflags-windows-dmd-x86" : ["even more flags if building for x86 using dmd"]

> Also, what do you do if the shared library needs to refer to types in the main static library?


You need to link it with your DLL, this will however will create lots of duplicated symbols in your executable.

In most cases this is undesireable, so instead one will usually put all common stuff into DLL and share across main executable and other DLL's that relies on it.

On Windows however DLL support is unfinished, so you are stuck with hacks and/or static libs option.

On Tuesday, 2 March 2021 at 00:40:06 UTC, Pillager86 wrote:
> What is the correct multi-platform way to build one dub project as a shared library, and load said shared library in a separate dub project? So far I am able to load a shared library and run a function from it (had to extern(C) it to get the symbol to load) by using "targetType":"dynamicLibrary" in the shared library project, but the main program exits with code -11 and if I don't unload the library manually I get a weird "Aborting from src/rt/sections_elf_shared.d(500) DSO being unregistered isn't current last one.Program exited with code -6" error that Google knows nothing about.
>
> [...]

https://www.flipcause.com/secure/cause_pdetails/ODcyMDE=

On Tuesday, 2 March 2021 at 10:00:46 UTC, Imperatorn wrote:
> On Tuesday, 2 March 2021 at 00:40:06 UTC, Pillager86 wrote:
>> What is the correct multi-platform way to build one dub project as a shared library, and load said shared library in a separate dub project? So far I am able to load a shared library and run a function from it (had to extern(C) it to get the symbol to load) by using "targetType":"dynamicLibrary" in the shared library project, but the main program exits with code -11 and if I don't unload the library manually I get a weird "Aborting from src/rt/sections_elf_shared.d(500) DSO being unregistered isn't current last one.Program exited with code -6" error that Google knows nothing about.
>>
>> [...]
>
> https://www.flipcause.com/secure/cause_pdetails/ODcyMDE=

I see the problem now. On Linux I can load a ScriptFunction into the Interpreter instance and run it. On Windows, it crashes with invalid memory access. How sad. DMildew modules will be a POSIX-only feature and that's OK because more people need to adopt other OS besides Windows, which was created by a psychopath anyway.