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License: MIT License
Demonstrating Bazel setup for Rust services with Cargo and Docker support.
License: MIT License
When a crate contains Rust macros, cross-compiling the target from MacOS to Linux fails. An example is the postgres crate.
bazel build //cargo:postgres --platforms //build/platform:musl
can't find crate for futures_macro
--> external/raze__futures_util__0_3_19/src/async_await/stream_select_mod.rs:6:9
|
6 | pub use futures_macro::stream_select_internal;
| ^^^^^^^^^^^^^ can't find crate
|
= note: extern location for futures_macro is of an unknown type: bazel-out/darwin-opt-exec-2B5CBBC6/bin/external/raze__futures_macro__0_3_19/libfutures_macro-152066848.dylib
= help: file name should be lib*.rlib or lib*..so
The error is caused because, for the futures_macro crate, a .dylib file was generated instead of a .rlib (or .so?) file.
The issue also occurs when I write my own macros and use the rust_proc_macro
Bazel rule.
Let's say I have this src/lib.rs
use proc_macro::TokenStream;
#[proc_macro_derive(HelloWorld)]
pub fn hello_world(_input: TokenStream) -> TokenStream {
TokenStream::new()
}
and BUILD.bazel like this:
load("@rules_rust//rust:defs.bzl", "rust_proc_macro")
rust_proc_macro(
name = "macro",
srcs = [
"src/lib.rs",
],
edition = "2018",
)
Running bazel build //:macro
now builds a valid .dylib file. However, bazel build //:macro --platforms //build/platform:musl
fails with the following error:
note: /usr/local/bin/x86_64-linux-musl-ld: cannot find -lgcc
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