While compiling from source, I see the following error:
error: failed to run custom build command for `roc_bitcode v0.0.1 (/home/stefan/src/roc/crates/compiler/builtins/bitcode)`
Caused by:
process didn't exit successfully: `/home/stefan/src/roc/target/debug/build/roc_bitcode-26668503bbc4355e/build-script-build` (exit status: 101)
--- stdout
cargo:rerun-if-changed=build.rs
Compiling zig object `object` to: /home/stefan/src/roc/crates/compiler/builtins/bitcode/zig-out/builtins-host.o
--- stderr
An internal compiler expectation was broken.
This is definitely a compiler bug.
Please file an issue here: https://github.com/roc-lang/roc/issues/new/choose
thread 'main' panicked at 'zig build object -Drelease=true failed 10 times in a row. The following error is unlikely to be a flaky error: error: unable to find zig installation directory '/home/stefan/.local/bin/zig': FileNotFound
', crates/compiler/builtins/bitcode/build.rs:179:25
LLVM 16
zig 0.12.0-dev.1664+8ca4a5240 (also tried with 0.9)
cargo 1.73.0
I think we are on zig 0.11
Thanks. With v0.11 I run into:
error: failed to run custom build command for `wasi_libc_sys v0.0.1 (/home/stefan/src/roc/crates/wasi-libc-sys)`
Caused by:
process didn't exit successfully: `/home/stefan/src/roc/target/debug/build/wasi_libc_sys-717ef5db1191d761/build-script-build` (exit status: 101)
--- stdout
cargo:rerun-if-changed=build.rs
cargo:rerun-if-changed=src/dummy.c
--- stderr
thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: Os { code: 2, kind: NotFound, message: "No such file or directory" }', crates/wasi-libc-sys/build.rs:33:10
Hmm, not sure. Maybe wasi libc has a system dependency? I always use nix and direnv to avoid dealing with dependencies.
Yes, using nix to build from source is highly recommended. For the first time, make sure to do cargo clean
before doing cargo build --release --bin roc
with nix, otherwise issues may arise from trying to re-use cached rust dependencies with non-nix dependencies.
I've managed to compile the compiler. I made a PR here to clarify the issues I ran into: https://github.com/roc-lang/roc/pull/6059
Thanks @Stéfan van der Walt, I'll do the review :)
Last updated: Jul 05 2025 at 12:14 UTC