Daniel Golle a1788e6156 tools/sccache: add sccache Rust compiler cache ... RUST_SCCACHE builds sccache 0.18.0 from a vendor tarball and makes it the RUSTC_WRAPPER of the cargo builds of host tools, target packages and libstd-rust. For target packages, scripts/rust-target-wrapper.sh runs it in turn. The option sits next to CCACHE and is available with any Rust toolchain of the build system. The packages feed defines RUST_SCCACHE as well, without a dependency, and Kconfig merges both definitions, so the tools and the cargo variables check for a Rust toolchain once more. sccache is built without default features: the local disk cache stays, the remote storage backends and their HTTP and TLS stacks are left out, so the build needs no host library. sccache needs rustc to build, so the rustc build from source and the sccache build run unwrapped. sccache keeps its cache and configuration in $(TOPDIR)/.sccache, or in RUST_SCCACHE_DIR when set, and its server listens on a socket in $(TMP_DIR), so that each tree has a server of its own. distclean removes .sccache, and the SCCACHE_* variables of the environment are unexported. Signed-off-by: Daniel Golle <daniel@makrotopia.org>		2026-10-30 12:06:08 +02:00
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Makefile	tools/sccache: add sccache Rust compiler cache	2026-10-30 12:06:08 +02:00