Unable to find libclang.so

[NobodyXu]

When using cross to cross compiling crate zstd in PR cargo-bins/cargo-binstall#148, the CI that use-cross: true all failed with libclang.so not found.

Edit:

The PR enabled feature bindgen of zstd and bindgen uses libclang.so to parse C headers.

[Emilgardis]

https://github.com/ryankurte/cargo-binstall/runs/6665668295?check_suite_focus=true#step:7:569

[Emilgardis]

works kinda on the newest images, either pull the newest unreleased cross version to override whatever actions-rs does, or set

CARGO_TARGET_${TARGET}_IMAGE=ghcr.io/cross-rs/armv7-unknown-linux-gnueabihf:edge

seems like there's some more issues though, we're missing linux-libc-dev-<target>-cross on the linux images

[NobodyXu]

We are using cross via actions-rs/cargo by setting use-cross: true.

Does changing env work for actions-rs/cargo?

Edit:

Seems like that we can adjust the image in Cross.toml

[Emilgardis]

Yes, it works for everything using cross.
You can also install cross before invoking use-cross and if actions-rs finds the cross binary it won't/shouldn't override it

You can adjust the image in the Cross.toml too ofc :)

[NobodyXu]

@Emilgardis The build still failed for armv7 glibc and aarch64 glibc:

  /usr/arm-linux-gnueabihf/include/limits.h:123:16: fatal error: 'limits.h' file not found

[Emilgardis]

As mentioned, missing linux-libc-dev-<target>-cross @NobodyXu

We should include that, pr pending :)

[NobodyXu]

As mentioned, missing linux-libc-dev--cross @NobodyXu

Ok, sorry I missed that part.

[Emilgardis]

hmm, seems like that's not it

[Emilgardis]

alright! Seems like you should enable pkg-config feature of the zstd crate, and then you'll need to install libzstd-dev and clang-3.9 (https://github.com/cross-rs/cross/wiki/FAQ#linking-external-libraries)

the zstd-sys crate doesn't have a valid discovery for cross compilation without that feature.

doing that however, we find that the version in ubuntu 16.04 is too old, which probably means you need this: https://github.com/cross-rs/cross/wiki/FAQ#newer-linux-versions / #591

ping #678 (this would be a great help for this scenario...)

[NobodyXu]

@Emilgardis We need it to be statically linked so that it can run on everywhere, so we probably cannot use external version of libzstd that is dynamically linked.

[Emilgardis]

of course, the issue is not with cross now however, you need to install zstd and clang-3.9 in the image that cross uses so that it/cargo/bindgen can find the relevant files.

[Emilgardis]

doing that however, we find that the version in ubuntu 16.04 is too old, which probably means you need this: cross-rs/cross/wiki/FAQ#newer-linux-versions / #591

instead of this, you could manually get the files needed and place them in the normal places or make cargo understand where they live

[NobodyXu]

@Emilgardis Is there anyway to fix

/usr/arm-linux-gnueabihf/include/limits.h:123:16: fatal error: 'limits.h' file not found, err: true

We can wait for the PR that fixes this.

Can you please point to me which PR fixes this issue so that we can subscribe and wait for it?

[Emilgardis]

the fix for it is for you to enable the pkg-config feature in zstd

[Emilgardis]

The other issues you'll encounter are solved with something like https://github.com/cross-rs/cross/wiki/Recipes and https://github.com/cross-rs/cross/wiki/FAQ#custom-images