Rework of the riscv64-linux CI build to use CMake cross-compilation on a
standard `ubuntu-24.04` runner, rather than a native RISE runner.
## What changed
**`ci/docker/Dockerfile.riscv64-linux`** (new):
- Ubuntu 24.04 base — has `crossbuild-essential-riscv64` in its package
repos
- Sets `CC=riscv64-linux-gnu-gcc` / `CXX=riscv64-linux-gnu-g++` so CMake
detects cross-compilation and causes LLVM to build a native
`llvm-tblgen` first, then cross-compile the rest of the toolchain
- Sets `CARGO_TARGET_RISCV64_UNKNOWN_LINUX_GNU_LINKER` for Rust
cross-builds
- `XDG_CACHE_HOME=/tmp/cache` avoids write permission issues in the
container
**`ci/docker-build.sh`**:
- Select `ci/docker/Dockerfile.<artifact>` if it exists, fall back to
the default `ci/docker/Dockerfile`
- Make the wasmtime volume mount conditional on
`WASI_SDK_CI_SKIP_SYSROOT != 1`
**`.github/workflows/main.yml`**:
- New `riscv64-linux` matrix entry: `os: ubuntu-24.04`, `rust_target:
riscv64-unknown-linux-gnu`
- `cross_cmake_args: -DCMAKE_SYSTEM_NAME=Linux
-DCMAKE_SYSTEM_PROCESSOR=riscv64 -DWASI_SDK_LLDB=OFF`
- `WASI_SDK_CI_SKIP_SYSROOT: 1`
- Handle `cross_cmake_args` in the cmake flags step
## Why WASI_SDK_CI_SKIP_SYSROOT
The cross-compiled clang runs on riscv64, not on the x86_64 build host,
so the wasm sysroot step is skipped.
## Why WASI_SDK_LLDB=OFF
Avoids cross-compiling libedit and libxml2 in this first iteration; can
be re-enabled as a follow-up.
Closes#607
---------
Signed-off-by: Bruno Verachten <gounthar@gmail.com>
This folder contains the docker images that are used in CI to build the wasi-sdk
release toolchains. Docker is used to intentionally use older Linux
distributions to build the toolchain to have a more maximal set of glibc
compatibility.
These images are intended to be used on an x86_64 host. Images start from the
Dockerfile.common file and then layer on target-specific
toolchains/options/etc as necessary.
Bruno Verachten
42b7263534