__extenddftf2 is found to be missing at runtime when using the WASI SDK to build Rust crates' C code

[adamnovak]

The WASI SDK folks said that WebAssembly/wasi-sdk#361 is probably a Rust issue.

I'm trying to build a Rust project that uses rusqlite (which compiles C code), for WebAssembly, for the wasm32-wasi Rust target.

When I do my build with:

RUSTC_LOG="rustc_codegen_ssa::back::link=info" CC_wasm32_wasi="$(pwd)/wasi-sdk-20.0/bin/clang" LIBSQLITE3_FLAGS="-DSQLITE_THREADSAFE=0" cargo build --release --target=wasm32-wasi

I end up with the Rust linker linking against /Users/anovak/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/wasm32-wasi/lib/libcompiler_builtins-a0294efb55e060eb.rlib, which does not define __extenddftf2. But the WASI SDK compiler version 20 (the current release) builds C code assuming it will link against its wasi-sdk-20.0/lib/clang/16/lib/wasi/libclang_rt.builtins-wasm32.a file, which does define __extenddftf2.

The WASI SDK folks suggested that the real problem is that the Rust libcompiler_builtins should define that symbol, and is out of date and needs updating. But I installed the wasm32-wasi target with rustup within the past 48 hours, so presumably I have the current version.

Can that function be added?

My full list of missing intrinsic-looking functions from my build seems to be:

 - func[0] sig=18 <__extenddftf2> <- env.__extenddftf2
 - func[1] sig=19 <__trunctfdf2> <- env.__trunctfdf2
 - func[2] sig=20 <__multf3> <- env.__multf3
 - func[3] sig=20 <__addtf3> <- env.__addtf3
 - func[4] sig=21 <__gttf2> <- env.__gttf2
 - func[5] sig=21 <__getf2> <- env.__getf2
 - func[6] sig=20 <__divtf3> <- env.__divtf3
 - func[7] sig=21 <__lttf2> <- env.__lttf2
 - func[8] sig=22 <__fixtfsi> <- env.__fixtfsi
 - func[9] sig=1 <__floatsitf> <- env.__floatsitf
 - func[10] sig=20 <__subtf3> <- env.__subtf3
 - func[11] sig=23 <__floatditf> <- env.__floatditf

Is libcompiler_builtins somehow out of date enough to be missing all of these?

[tgross35]

This should have been fixed by #593

[tgross35]

I am going to close this as completed; please reopen if that is not accurate.