command export '_ZSt7nothrow' is not a function

[vshymanskyy]

Steps to Reproduce

git clone https://github.com/wasm3/wasm3-self-compiling.git

cd wasm3-self-compiling

wasmtime run --mapdir=/::. --mapdir=./::. ./wasm/clang.wasm -- -cc1 -triple wasm32-unknown-wasi -isysroot /sys -internal-isystem /sys/include -emit-obj -o source/hello/hello.o source/hello/hello.c -O3

Expected Results

Compilation succeeds

Actual Results

Error: failed to run main module `./wasm/clang.wasm`

Caused by:
    0: failed to instantiate "./wasm/clang.wasm"
    1: command export '_ZSt7nothrow' is not a function

Versions and Environment

Wasmtime version or commit: 0.26.0

Operating system: Ubuntu 21.04
Architecture: x86-64

Extra Info

A similar command works with Wasm3, Wasmer, Node.js (wasm-run)

[peterhuene]

@sunfishcode the repro clang.wasm exports a bunch of globals that aren't expected for "commands" to export.

Perhaps we should warn on or ignore non-function exports for commands (that we don't otherwise have a deprecation message for)?

[tschneidereit]

Is this the same issue as in #2587?

[peterhuene]

It appears to be and I think your proposed solution there is a good one.

[vshymanskyy]

Duplicate of #2587. Sorry didn't notice it!
Is there any workaround currently?

[tschneidereit]

No worries at all—thank you for the report!

Is there any workaround currently?

I don't think there is, I'm afraid :( I think the solution in the other bug shouldn't be too hard to implement, but I unfortunately don't have the bandwidth to do so right now :(

[peterhuene]

I have a fix ready that I'll put up a PR shortly for.

[sunfishcode]

@vshymanskyy Can you describe how you produced the wasm file? Workarounds are one thing, but I'm also curious if there's an underlying bug in clang or wasm-ld here. Are you using any special flags, like --export-dynamic?

[vshymanskyy]

@sunfishcode it was found in the wild: https://wapm.io/package/clang 😀
The files were produced by @binji : https://github.com/binji/llvm-project/releases