Compile Godot Engine as a library.

[fire]

Fixes: godotengine/godot-proposals#4773

• Replace the entry points of main of Windows and Linux.
• Replace the entry points of osx.
• Replace the entry points of android.
• Replace the entry points of ios.
• Replace the entry points of uwp.
• Investigate the entry points of Javascript.
• Cannot avoid 64k symbols limit on Windows dll format.

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Part of the V-Sekai group. https://github.com/v-sekai

[fire]

For Windows only godot_main is exposed. For Mac and Linux all symbols are exposed.

See also https://github.com/lucasg/Dependencies.

[Faless]

My understanding is that calling godot_main will basically result in the main loop starting and the function only returning when the main loop quits. Am I missing something? 👀

[fire]

Yes, in my example and tested on the Linux platform I run the scenetree iteration loop manually.

https://github.com/V-Sekai/godot/blob/elixir/c_src/godot/godot_elixir.cpp

[Faless]

I see, so the windows version which only exposes the godot_main isn't usable for this purpose right?

[fire]

There are three problems on Windows.

1. there's a 64k symbols limit.

scons -j32 library_type=shared_library use_llvm=yes use_mingw=yes LINKFLAGS='-Wl,--export-all-symbols -Wl,-pdb=' CCFLAGS='-g -gcodeview' debug_symbols=no

2. If we can't expose everything, there's ways to force map a list of symbols.

https://stackoverflow.com/a/54067711

3. Need know what symbols to keep.

[bruvzg]

If we can't expose everything, there's ways to force map a list of symbols.

It is necessary to directly exposing everything? Besides, exported C++ symbols are not portable and will be usable only if main app is built with exactly same compiler and C++ runtime version, which kinda makes it almost useless.

Maybe it's better to expose only a few pure-C wrappers for OS/Main initialization / finalization, and functions to get access GDExtension interface struct and register initializers/terminators, the and the rest can be done via GDExtension API.

[fire]

It’s a good suggestion to get at the gdextension api. Or at least the classdb and execution of the api. Can look

[fire]

I don't have time to salvage this proposal to use the design from @bruvzg before the feature freeze, but it's a good idea.

[fire]

Can be salvaged or used as is. Closing for now.