[Rust] Implement flatc build script wrapper #5252
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| /// .compile(); | ||
| /// } | ||
| /// ``` | ||
| pub fn schema<P: AsRef<Path>>(&mut self, file: P) -> &mut Self { |
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Wasn't sure what to name this argument as (adding FBS files). I think it might be better of as distinct from --schema.
rust/flatc/Cargo.toml
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| license = "Apache-2.0" | ||
| edition = "2018" | ||
| build = "build.rs" | ||
| description = "flatc Rust build script wrapper" |
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I think we need to make it clear that this new Cargo package is only part of the story -- how about making this description read: Companion package to flatbuffers, to generate code at compile time.?
rust/flatc/src/lib.rs
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| //! # flatc | ||
| //! | ||
| //! A library for build scripts to compile FlatBuffer schemas. |
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Again I think we need to point explicitly to the main flatbuffers package so that users don't get confused. Maybe a description like: Companion package to flatbuffers, to generate code at compile time.
rust/flatc/src/lib.rs
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| fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { | ||
| write!( | ||
| f, | ||
| "An {} error occurred during FlatBuffer compilation: {}", |
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How about we add a phrase here to say: "with crate-provided flatc"? Might save users a lot of time debugging flatc versions, especially if they have it installed in /usr/local/bin or something, as mac users do.
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I've extended the error reporting to include the path of the executable compiled by the crate and the commit SHA that it was built from.
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@rjsberry Also there is a CI failure related to how this PR is adding a Cargo Workspace to the project. WDYT about just keeping the crates totally separate? https://travis-ci.org/google/flatbuffers/jobs/509127091#L1018 |
This can be removed. I have always used a workspace when I have multiple crates in one repository but cargo can locate the crate under |
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wrt. testing there is a small test in |
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| impl Build { | ||
| #[doc(hidden)] | ||
| pub fn output<P: AsRef<Path>>(&mut self, dir: P) -> &mut Self { |
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Not happy with having this as part of the public interface and simply hidden from the docs (as it would permit misuse of Builder), but we need to do this to test the crate from /tests/rust_usage_test.
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Is there a reason why the Travis pipeline is running with |
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It seems that the CMake components in How do you think we should resolve this? A couple of ideas come to mind:
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Not sure, yet. @aardappel any thoughts? |
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I'm not an expert on the technologies involved, but would it make most sense to have the build for the crate be completely isolated in a subdir, such that it builds its own Or, if we don't care to test that, can it reuse the existing |
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We could use the existing flatc, but I think it's important we verify the CMake build done by the crate as part of CI. Seems like there's also an open issue for arch handling of Visual Studio generators in the |
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| use std::{env, fs, path::Path}; | ||
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| #[test] | ||
| fn build_script_wrapper() { |
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@rjsberry WDYT about comparing that the contents are the same as monster_test_generated.rs?
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Sounds reasonable. I've run a quick check locally and am seeing quite a few differences. When and how is monster_test_generated.rs generated?
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@rjsberry It's the result of generate_code.sh
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This pull request is stale because it has been open 6 months with no activity. Please comment or this will be closed in 14 days. |
See also #5216.
This PR implements a wrapper around
flatcusing Rust code which is intended to be used in Rust build script files. Once merged it will be immediately useable:@aardappel @rw Do you have any thoughts on distribution via crates.io?
For working with a specific commit of
flatc, the above is sufficient and pushing to crates.io is not required. However with the current structure (crate as a subdirectory) it will not be possible to use the build script with revisions offlatccommitted before the wrapper.For crates.io distribution we could push on releases of FlatBuffers and tie the commit of this wrapper with the release version.