Support for wasm32-wasip1-threads

[oligamiq]

The -pthread is required as a flag.
For -D_WASI_EMULATED_MMAN, it is not necessary yet because the Rust compiler does not support it!

[NobodyXu]

Sorry I didn't quite get you.

cc-rs only compiles the source code and produce an archive, it does not performing linking, so I don't think -pthread is needed

[oligamiq]

When compiling C or C++ for wasm32-wasip1-threads, it is necessary to include the -pthreads flag. Otherwise, during linking, you will encounter an error such as:

note: wasm-ld: error: --shared-memory is disallowed by dlmalloc.o because it was not compiled with 'atomics' or 'bulk-memory' features.

[NobodyXu]

When compiling C or C++ for wasm32-wasip1-threads, it is necessary to include the -pthreads flag. Otherwise, during linking, you will encounter an error such as:

note: wasm-ld: error: --shared-memory is disallowed by dlmalloc.o because it was not compiled with 'atomics' or 'bulk-memory' features.

So -pthread needs to be provided when compiling objects, otherwise the linking will fail?

Hmmm I didn't know that -pthread flag has that effect during compilation.

[oligamiq]

Yes

[NobodyXu]

In that case, we might want to special case for this target

[oligamiq]

Small example:
https://github.com/oligamiq/small_example_pthread

Running the command cargo +nightly b --target wasm32-wasip1-threads fails.

However, when I replace rusqlite in Cargo.toml, it succeeds.
The only patch applied is for pthreads:
oligamiq/rusqlite@95bcbdf

[NobodyXu]

Thanks, I can reproduce this.

Will create a PR for it.