How can I automatically download the dependencies of an external Rust crate (similar to Cargo)? #14096
How can I automatically download the dependencies of an external Rust crate (similar to Cargo)?
#14096
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Hi! I'm trying to port a fairly complex project to Rust, and since I need to heavily interface with existing C/C++ libraries, I'm trying to use a polyglot build system, in this case Meson. I managed to make it compile Rust, and link against one of the C libraries I'm using. Now, I want to use an external crate (for the sake of MWE, let's say I managed to write a rand.wrap file [wrap-git]
url = https://github.com/rust-random/rand.git
revision = 0.8.5
depth = 1
method = cargo
[provide]
dependency_names = rand-0.8-rsand my relevant meson.build is project('meson-test', ['rust', 'c'],
version : '0.1',
default_options : ['warning_level=3'],
meson_version: '>=1.0.0')
c_lib = static_library('utils', 'utils.c')
# build cJSON lib with CMake
cjson = dependency('cJSON')
# generate cJSON Rust bindings
rust = import('rust')
generated = rust.bindgen(
input : 'cJSON/cJSON.h',
output : 'generated-cJSON.rs',
dependencies : cjson,
args : ['--no-rustfmt-bindings'],
)
rand = dependency('rand')
exe = executable('meson_test',
'main.rs', generated,
link_with: [c_lib],
dependencies: [cjson])but I get the error and in case it's useful, the complete log is What am doing wrong? think this may be related to #13466 . Thanks! |
Answered by
bonzini
Jun 27, 2026
Replies: 3 comments 5 replies
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Since dependency_names is |
0 replies
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Meson can synthesize new My understanding is the eventual goal is to plumb this into |
5 replies
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Thanks! I tried changing my For what I understand from the manual, Meson can automatically download crate dependencies, even for subprojects, :
I would interpret this as: if one of your subprojects is a Cargo one, Meson can derive the dependencies automatically. I tried using a simpler crate, By contrast, it works with a crate that has no dependencies, for instance if I try using |
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Update: I misread, Meson searches for the lock file, not the toml. So I I use Python 3.12.3, so it shouldn't be a problem of the parser. Is it a bug, or did i do something wrong? Thanks |
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Aha, that one I definitely know the answer to. It is a meson bug that was reported in #13826 and got fixed and backported into meson 1.6.1 -- you said you have 1.6.0 installed, so try updating to the latest bugfix release with |
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Thanks, it worked! 🎉 Now, iiuc, this means that to use crates dependencies in the main project meson is building, we need to provide a wrap file for each one. Is it planned for the future to simply list them, in a Cargo.toml or in the meson.build? I'm thinking of something like rust = import('rust')
rand = rust.cratesio('rand', '0.8.0')
executable('test_project', 'main.rs', dependencies : rand) |
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I think so but @xclaesse would know better (I'm not the main driver of rust support in meson). |
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Hi @awbertulli support for external crates has taken shape in 1.11.0. See the documentation or #14639 for more information. |
0 replies
Answer selected by
awbertulli
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Hi @awbertulli support for external crates has taken shape in 1.11.0. See the documentation or #14639 for more information.