Unable build to wasm32-unknown-unknown target on macos

[stickmy]

The following warnings were emitted during compilation:
warning: /workspace/quickjs-binding/target/wasm32-unknown-unknown/debug/build/rquickjs-sys-4f6d692d8e0606a0/out/libregexp.c:24:10: fatal error: 'stdlib.h' file not found
warning: #include <stdlib.h>
warning: ^~~~~~~~~~
warning: 1 error generated.
error: failed to run custom build command for rquickjs-sys v0.1.7
Caused by:
process didn't exit successfully: /workspace/quickjs-binding/target/debug/build/rquickjs-sys-0833c19788412099/build-script-build (exit status: 1)
--- stdout
cargo:rerun-if-changed=build.rs
cargo:rerun-if-env-changed=CARGO_FEATURE_EXPORTS
cargo:rerun-if-env-changed=CARGO_FEATURE_BINDGEN
cargo:rerun-if-env-changed=CARGO_FEATURE_UPDATE_BINDINGS
cargo:rerun-if-env-changed=CARGO_FEATURE_DUMP_BYTECODE
cargo:rerun-if-env-changed=CARGO_FEATURE_DUMP_GC
cargo:rerun-if-env-changed=CARGO_FEATURE_DUMP_GC_FREE
cargo:rerun-if-env-changed=CARGO_FEATURE_DUMP_FREE
cargo:rerun-if-env-changed=CARGO_FEATURE_DUMP_LEAKS
cargo:rerun-if-env-changed=CARGO_FEATURE_DUMP_MEM
cargo:rerun-if-env-changed=CARGO_FEATURE_DUMP_OBJECTS
cargo:rerun-if-env-changed=CARGO_FEATURE_DUMP_ATOMS
cargo:rerun-if-env-changed=CARGO_FEATURE_DUMP_SHAPES
cargo:rerun-if-env-changed=CARGO_FEATURE_DUMP_MODULE_RESOLVE
cargo:rerun-if-env-changed=CARGO_FEATURE_DUMP_PROMISE
cargo:rerun-if-env-changed=CARGO_FEATURE_DUMP_READ_OBJECT
Appliyng patch patches/check_stack_overflow.patch
patching file quickjs.c
Appliyng patch patches/infinity_handling.patch
patching file quickjs.c
Hunk #1 succeeded at 10235 (offset 44 lines).
Hunk #2 succeeded at 41732 (offset 168 lines).
Hunk #3 succeeded at 47839 (offset 168 lines).
Appliyng patch patches/atomic_new_class_id.patch
patching file quickjs.c
Hunk #1 succeeded at 3371 (offset 18 lines).
Appliyng patch patches/read_module_exports.patch
patching file quickjs.c
Hunk #1 succeeded at 27254 (offset 93 lines).
patching file quickjs.h
Hunk #1 succeeded at 1039 (offset 4 lines).
TARGET = Some("wasm32-unknown-unknown")
OPT_LEVEL = Some("0")
HOST = Some("x86_64-apple-darwin")
CC_wasm32-unknown-unknown = None
CC_wasm32_unknown_unknown = None
TARGET_CC = None
CC = None
CFLAGS_wasm32-unknown-unknown = None
CFLAGS_wasm32_unknown_unknown = None
TARGET_CFLAGS = None
CFLAGS = None
CRATE_CC_NO_DEFAULTS = None
DEBUG = Some("true")
running: "clang" "-O0" "-ffunction-sections" "-fdata-sections" "-fPIC" "-g" "-fno-omit-frame-pointer" "--target=wasm32-unknown-unknown" "-Wall" "-D_GNU_SOURCE" "-DCONFIG_VERSION="2020-01-19"" "-DCONFIG_BIGNUM" "-DCONFIG_MODULE_EXPORTS" "-o" "/workspace/quickjs-binding/target/wasm32-unknown-unknown/debug/build/rquickjs-sys-4f6d692d8e0606a0/out/libregexp.o" "-c" "/workspace/quickjs-binding/target/wasm32-unknown-unknown/debug/build/rquickjs-sys-4f6d692d8e0606a0/out/libregexp.c"
cargo:warning=/workspace/quickjs-binding/target/wasm32-unknown-unknown/debug/build/rquickjs-sys-4f6d692d8e0606a0/out/libregexp.c:24:10: fatal error: 'stdlib.h' file not found
cargo:warning=#include <stdlib.h>
cargo:warning= ^~~~~~~~~~
cargo:warning=1 error generated.
exit status: 1
--- stderr
error occurred: Command "clang" "-O0" "-ffunction-sections" "-fdata-sections" "-fPIC" "-g" "-fno-omit-frame-pointer" "--target=wasm32-unknown-unknown" "-Wall" "-D_GNU_SOURCE" "-DCONFIG_VERSION="2020-01-19"" "-DCONFIG_BIGNUM" "-DCONFIG_MODULE_EXPORTS" "-o" "/workspace/quickjs-binding/target/wasm32-unknown-unknown/debug/build/rquickjs-sys-4f6d692d8e0606a0/out/libregexp.o" "-c" "/workspace/quickjs-binding/target/wasm32-unknown-unknown/debug/build/rquickjs-sys-4f6d692d8e0606a0/out/libregexp.c" with args "clang" did not execute successfully (status code exit status: 1).
warning: build failed, waiting for other jobs to finish...
Process finished with exit code 101

[coderedart]

There's a long discussion at mlua-rs/mlua#23 . basically, c bindings crates cannot be compiled to wasm. so, the best alternative is to wait for a pure rust impl of JS like Boa or starlight

[stickmy]

There's a long discussion at khvzak/mlua#23 . basically, c bindings crates cannot be compiled to wasm. so, the best alternative is to wait for a pure rust impl of JS like Boa or starlight

Yes, also some discussions on Tracking issue for the unstable "wasm" ABI.

The Boa performance than quickjs still has a certain gap.

[coderedart]

are there any public benchmarks for Boa?

[stickmy]

are there any public benchmarks for Boa?

unofficial benchmark boa-dev/boa#1924 (comment)

And the same benchmark for quickjs here https://bellard.org/quickjs/bench.html

[lastmjs]

Sorry, are you saying that rquickjs doesn't work with Wasm at all? I'm using another QuickJS bindings crate and it works with Wasm, though is more immature. I was in the process of switching to rquickjs and just ran into this.

Please help me understand.

[coderedart]

@lastmjs

As quickjs is a C library, it won't support compiling to wasm32-unknown-unknown (wuu) target which is what wasm-bindgen (and its users like winit/reqwest etc..) uses.

But, you can probably compile this to wasm32-unknown-emscripten (wue) target, as rust will use emscripten compiler to compile C source to wasm. Most crates (eg: wgpu/glow/glfw/sdl2 etc..) would work fine on this target, but any crates which use wasm-bindgen like winit/reqwest etc.. won't work on emscripten.

Both wue and wuu are browser targets though.

idk what quickjs bindings you were using in the past though. if you were targeting wasm32-wasi with https://docs.rs/quickjs-wasm-rs/2.0.1/quickjs_wasm_rs/ , then that is a non-browser platform. rquickjs (or any crate tbh) should work fine on wasm32-wasi (or atleast should be easy enough to get working).

[lastmjs]

We are in a non-browser wasm32-wasi environment, currently using https://crates.io/crates/quickjs-wasm-rs

Are you staying that rquickjs could be used in place of quickjs-wasm-rs now or in the future?

We have everything working, we just want to swap out bindings for rquickjs.

[coderedart]

It should be possible to use rquickjs on wasm32-wasi. But it would probably be hard to get it setup for the first time.

you will need to see how quickjs-wasm-rs people build quickjs https://github.com/bytecodealliance/javy/blob/main/crates/quickjs-wasm-sys/build.rs and try to do the same for rquickjs.

[mmoskal]

I added WASI support here #245

[DelSkayn]

WASI support is now merged, but we won't support wasm-unknown-unknown for the foreseeable future as there is no way to link a libc required for QuickJS.

I'll leave this issue open for if this ever changes but mark it as won't fix for now.