Re: rust: cargo build-system: how to handle libraries

[ng0 <ng0@libertad.pw>]

David Craven <david@craven.ch> writes:

>> We run (or this is the default) cargo with `--bin`, which is
>> necessary for everything which needs to be compiled and features
>> a Cargo.toml.
>
> All crates have a Cargo.toml file. The interesting crates are the ones with
> a Cargo.lock file.
>
>> To "build" libraries, we have to explicitly tell cargo to not
>> run/build/whatever with --bin ?
>
> Building libraries is currently not very useful at the moment, since they are
> not meant to be libraries in the C sense, but in the sense that it's a
> collection
> of source code that can be reused in a rust project. One can create a library
> in the C sense, but most crates do not do this and are not intended to be abi
> compatible with C.
>
>> Or do I have to interprete what I read a while ago "we just need
>> to copy the libraries to the store" as literally "if we encounter
>> no Cargo.toml, let's copy everything to the store as is"?
>
> If we encounter no Cargo.lock file it generally means the above.
>

Thanks for your answer.

But, ouch... note to self, packaging while hanging out with other
people to watch streamed talks sometimes does not work out.
The actual failure is different, the build system (currently)
expects a Cargo.toml everywhere, and the folder `libc-test'
doesn't seem to have one, breaking the build phase.

phase `unpack' succeeded after 0.1 seconds
starting phase `patch-usr-bin-file'
phase `patch-usr-bin-file' succeeded after 0.0 seconds
starting phase `patch-source-shebangs'
patch-shebang: ./ci/docker/arm-linux-androideabi/accept-licenses.sh: warning: no binary for interpreter `expect' found in $PATH
patch-shebang: ./ci/docker/arm-linux-androideabi/install-ndk.sh: changing `/bin/sh' to `/gnu/store/qkw4zrwfybxww8f56nkb6hggxambk89b-bash-4.4.0/bin/sh'
patch-shebang: ./ci/docker/arm-linux-androideabi/install-sdk.sh: changing `/bin/sh' to `/gnu/store/qkw4zrwfybxww8f56nkb6hggxambk89b-bash-4.4.0/bin/sh'
patch-shebang: ./ci/dox.sh: changing `/bin/sh' to `/gnu/store/qkw4zrwfybxww8f56nkb6hggxambk89b-bash-4.4.0/bin/sh'
patch-shebang: ./ci/run.sh: changing `/bin/sh' to `/gnu/store/qkw4zrwfybxww8f56nkb6hggxambk89b-bash-4.4.0/bin/sh'
phase `patch-source-shebangs' succeeded after 0.0 seconds
starting phase `configure'
phase `configure' succeeded after 0.0 seconds
starting phase `patch-generated-file-shebangs'
patch-shebang: ./ci/docker/arm-linux-androideabi/accept-licenses.sh: warning: no binary for interpreter `expect' found in $PATH
phase `patch-generated-file-shebangs' succeeded after 0.0 seconds
starting phase `build'
error: failed to read `/tmp/guix-build-rust-libc-0.2.18.drv-0/libc-0.2.18/libc-test/Cargo.toml`

Caused by:
  No such file or directory (os error 2)
phase `build' failed after 0.5 seconds
builder for `/gnu/store/wcn4kyhfmp6pi8kdpssdc3k90hkwwhrp-rust-libc-0.2.18.drv' failed with exit code 1
@ build-failed /gnu/store/wcn4kyhfmp6pi8kdpssdc3k90hkwwhrp-rust-libc-0.2.18.drv - 1 builder for `/gnu/store/wcn4kyhfmp6pi8kdpssdc3k90hkwwhrp-rust-libc-0.2.18.drv' failed with exit code 1
guix build: error: build failed: build of `/gnu/store/wcn4kyhfmp6pi8kdpssdc3k90hkwwhrp-rust-libc-0.2.18.drv' failed


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