Buildroot documentation specifies that cargo-based package should only
depends on BR2_PACKAGE_HOST_RUSTC_ARCH_SUPPORTS and selects
BR2_PACKAGE_HOST_CARGO but this fails with the following error:
warning: (BR2_PACKAGE_LIBRSVG) selects BR2_PACKAGE_HOST_CARGO which has
unmet direct dependencies (BR2_PACKAGE_HAS_HOST_RUSTC)
Indeed, host-cargo depends on
BR2_PACKAGE_HAS_HOST_RUSTC which is selected only when host-rustc is
selected.
So instead of having to select both cargo and rustc in each cargo-based
package, replace BR2_PACKAGE_HAS_HOST_RUSTC dependency by
BR2_PACKAGE_HOST_RUSTC_ARCH_SUPPORTS and select
BR2_PACKAGE_HOST_RUSTC
Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
This new package provides Cargo, the Rust official package manager.
Cargo is written in Rust and uses Cargo as its build system. It also
depends on other Rust packages.
Normally, a previously installed version of Cargo would be used to:
1. Fetch the dependencies.
2. Build the new version of Cargo, using the available Rust compiler.
But the fetching step prevents offline builds. So instead two features
of Cargo are leveraged: vendoring [1] and local registry.
First, a tarball of the build dependencies generated using `cargo
vendor` is fetched along with Cargo source code.
Then, the build process is as follows:
1. The tarball of the build dependencies is uncompressed in a local
registry.
2. A snapshot of Cargo, provided by cargo-bin, builds the final
version of Cargo.
3. A configuration file telling Cargo how to cross-compile programs for
the target is generated and installed.
Currently, only the host variant is provided.
[1] https://github.com/alexcrichton/cargo-vendor
[Peter: use src.fedoraproject.org, fix comment]
Signed-off-by: Eric Le Bihan <eric.le.bihan.dev@free.fr>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
