On Friday, 3 January 2020 at 10:34:40 UTC, Sebastiaan Koppe wrote:
You can track the work here: https://github.com/skoppe/druntime/tree/wasm
I gave it a quick glance; looks pretty good, and like pretty much work. ;) - Thx.
The compiler should probably help a bit by firstly predefining a version `CRuntime_WASI` (either for all wasm targets, or for triples like wasm32-unknown-unknown-wasi) and secondly emitting TLS globals as regular globals for now, so that you don't have to add `__gshared` everywhere.
- reals (probably are going to be unsupported)
It's probably just a matter of checking which type clang uses for C `long double` when targeting wasm, and making LDC use the same type.
- wasi libc needs to be distributed (either in source and compiled into wasm druntime) or statically linked
I'd prefer a static lib (and referencing that one via `-defaultlib=druntime-ldc,phobos2-ldc,wasi` in ldc2.conf's wasm section). Building it via LDC CI for inclusion in (some?) prebuilt LDC packages is probably not that much of a hassle with a clang host compiler.
once ldc-build-druntime works
If you need some CMake help (excluding C files etc.), https://github.com/ldc-developers/ldc/pull/2787 might have something useful.
(_start is the wasm's equivalent of _Dmain)
Not really; _start (in libc) is used on Linux too, which sets up the C runtime, then calls C main, which calls druntime's _d_run_main which in turn calls _Dmain.
