building c-platform example · beginners

Where are <errno.h> and all the other includes supposed to come from? I'm just running cargo run examples/hello-world/c-platform/helloC.roc and getting:

    Finished dev [unoptimized + debuginfo] target(s) in 0.30s
     Running `target/debug/roc examples/hello-world/c-platform/helloC.roc`
🔨 Rebuilding host...
thread '<unnamed>' panicked at 'Failed to rebuild host.c - stderr of the `clang` command was:
/Users/jared/clone/fork/roc/examples/hello-world/c-platform/host.c:1:10: fatal error: 'errno.h' file not found
#include <errno.h>
         ^~~~~~~~~
1 error generated.
', compiler/build/src/link.rs:1191:27
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: Any { .. }', cli/src/build.rs:265:46

Jared (Jun 10 2022 at 02:32):

hm ok so I found errno.h in $(xcrun --show-sdk-path)/usr/include, but I don't know what env vbl incantation to use to get rust to tell clang about it.

Jared (Jun 10 2022 at 02:38):

Anton (Jun 10 2022 at 09:05):

Hi @Jared, are you using nix? Setting everything up is quite complicated, which is why we recommend nix to do it quickly and reliably.

Jared (Jun 10 2022 at 12:23):

yeah I'm not using nix, because I'm stubborn and also I don't have a ton of free disk space to throw around :sweat_smile: but I did get things working eventually.

Jared (Jun 10 2022 at 13:22):

I'm curious how nix would fix the errno.h issue though. Is it putting files in some (more) well-known place? Or installing llvm differently?

Anton (Jun 10 2022 at 13:31):

I'm not sure, I also have a setup that does not use nix and I've never seen this issue :shrug: It could be you've made some specific changes to your system in the past that result in this error.

Stream: beginners

Topic: building c-platform example