nikomatsakis (May 22 2021 at 21:12): nikomatsakis (May 22 2021 at 21:12):Hey folks! I would like to generate a Rust executable that will run graphviz. I currently generate HTML based on viz.js, which is basically a WASM-ified version of graphviz. I would rather just generate SVG directly by creating my "dot" file and then executing an embedded copy of graphviz. In particular, I don't want to require that the graphviz executable (or ideally even the sources) are found on the system running my rust program.
nikomatsakis (May 22 2021 at 21:12):How do I do it!
nikomatsakis (May 22 2021 at 21:12):cc @Alex Crichton or @fitzgen (he/him)
Alex Crichton (May 22 2021 at 21:14):@nikomatsakis your goal being to basically build a Rust executable that uses wasmtime to execute a compiled-in wasm blob that runs graphviz?
nikomatsakis (May 22 2021 at 21:14):I guess so
nikomatsakis (May 22 2021 at 21:14):I don't care in particular that it's wasmtime
nikomatsakis (May 22 2021 at 21:14):but that is I guess the most likely candidate
Alex Crichton (May 22 2021 at 21:14):do you have the wasm blob on hand and are familiar with it? or is it a black box of sorts?
nikomatsakis (May 22 2021 at 21:14):I'm probably making life harder than I have to
Alex Crichton (May 22 2021 at 21:14):(presumably there's a lot of fancy JS interopereating with the wasm blob as well)
nikomatsakis (May 22 2021 at 21:15):well, right now I have nothing
fitzgen (he/him) (May 22 2021 at 21:15):Compile graphviz to wasm with wasi using wasi-sdk, then run it via wasmtime
nikomatsakis (May 22 2021 at 21:15):I generate a dot file
nikomatsakis (May 22 2021 at 21:15):I could use this Rust graphviz package, but it wants a graphviz executable, and I don't like that idea
nikomatsakis (May 22 2021 at 21:15):fitzgen (he/him) said:
Compile graphviz to wasm with wasi using wasi-sdk, then run it via wasmtime
this sounds like what I had in mind
nikomatsakis (May 22 2021 at 21:15):are there instructions for how to do that sort of thing?
nikomatsakis (May 22 2021 at 21:16):this is partly an excuse for me to play with wasm, of course
fitzgen (he/him) (May 22 2021 at 21:16):Using the existing wasm blob is probably a no go; it’s probably JS specific, as Alex mentions
fitzgen (he/him) (May 22 2021 at 21:16):https://github.com/WebAssembly/wasi-sdk
nikomatsakis (May 22 2021 at 21:17):can I apt-get that?
fitzgen (he/him) (May 22 2021 at 21:17):Read me has details; pretty much just setting CC and passing a couple flags
fitzgen (he/him) (May 22 2021 at 21:17):Probably not
nikomatsakis (May 22 2021 at 21:17):yeah, ok, it doesn't look too hard
nikomatsakis (May 22 2021 at 21:17):(deleted)
nikomatsakis (May 22 2021 at 21:18):fitzgen (he/him) said:
Probably not
too bad :)
fitzgen (he/him) (May 22 2021 at 21:18):I personally don’t install it to /opt, just a local dir in my home so I can have multiple versions installed in parallel
nikomatsakis (May 22 2021 at 21:18):this is like just on the limit of complexity I am willing to endure
nikomatsakis (May 22 2021 at 21:19):I have to copy and paste shell commands and edit them, but there's only 2, and the edits are trivial :)
nikomatsakis (May 22 2021 at 21:19):ok
fitzgen (he/him) (May 22 2021 at 21:19):This may require patching graphviz, btw. I don’t know if it uses signals but that’s a common thing to have to turn off
fitzgen (he/him) (May 22 2021 at 21:19):And multithreading
nikomatsakis (May 22 2021 at 21:20):ok
nikomatsakis (May 22 2021 at 21:20):I suppose I could use https://crates.io/crates/graphviz-sys
nikomatsakis (May 22 2021 at 21:20):that's so much less cool :)
nikomatsakis (May 22 2021 at 21:21):also I guess that would require the people running cargo build to have the libraries on their system
nikomatsakis (May 22 2021 at 21:21):which is kind of what I want to avoid
fitzgen (he/him) (May 22 2021 at 21:21):/me nods
nikomatsakis (May 22 2021 at 21:21):and me to write unsafe code
nikomatsakis (May 22 2021 at 21:37):checking for gcc... /home/nmatsakis/versioned/skill-tree/graphviz/wasi-sdk-12.0/bin/clang --sysroot='/home/nmatsakis/versioned/skill-tree/graphviz/wasi-sdk-12.0/share/wasi-sysroot
checking whether the C compiler works... no
configure: error: in `/home/nmatsakis/versioned/skill-tree/graphviz/graphviz-2.47.1':
configure: error: C compiler cannot create executables
I suppose that should not be surprising :)
Alex Crichton (May 22 2021 at 21:47):tbh honest none of this is likely to succeed
Alex Crichton (May 22 2021 at 21:47):if you're lucky you can configure graphviz for cross compilation
nikomatsakis (May 22 2021 at 21:47):yeah I think I decided to just give up
Alex Crichton (May 22 2021 at 21:47):if you're lucky it'll actually compile with wasi-sdk
Alex Crichton (May 22 2021 at 21:47):if you're lucky it'll actually produce a meaningful output
Alex Crichton (May 22 2021 at 21:47):but anything can go wrong along the way and it's all "goop of porting a C project" which can get... tricky
nikomatsakis (May 22 2021 at 21:48):yeah I have no real appetite for that :)
nikomatsakis (May 22 2021 at 21:49):anyway I have a workable-ish system with viz.js
Last updated: Dec 23 2024 at 12:05 UTC