`va_list`
lithiumtoast opened this issue · comments
Found when generating bindings for flecs: https://github.com/SanderMertens/flecs
/* Append format string with argument list to a buffer.
* Returns false when max is reached, true when there is still space */
FLECS_API
bool ecs_strbuf_vappend(
ecs_strbuf_t *buffer,
const char *fmt,
va_list args);It's not clear how va_list should be handled.
There is some discussion here on a similar issue: dotnet/runtime#9316
It's my understanding that for flecs, functions which use va_list which are exported are optional. Short term solution is to ignore any exported function which has va_list in the parameters.
There is no immediate clear way to proceed with this. Best to tread water on this and look into it again at a future date.
For now, va_list is remapped into IntPtr where necessary to avoid compilation errors.
heya, this might interest you https://github.com/jeremyVignelles/va-list-interop-demo
@mfkl Thanks.
va_list reading seems hard to do in a cross-platform way. Each platforms has its own implementation and I'm not sure it would work.
Rough. I'm working on adding support for multi-pass so that Clang can parse the translation unit using cross-compilation. Once that is finished I can expand the integration tests to do a dry-run of calling C# bindgen code for each platform and see what passes / fails. From there I can tackle this and add support for va_list but it will be limited by what hardware I have available either on cloud or in house.
Now that multi-pass is in, I'm taking a look at this again. While it would be interesting to do, I don't think I'm very interested in adding support right now myself. If someone wants to take a crack at it, I'm always open to contributions.