inherit python3native # Common variables used by all Rust builds export rustlibdir = "${libdir}/rust" FILES:${PN} += "${rustlibdir}/*.so" FILES:${PN}-dev += "${rustlibdir}/*.rlib ${rustlibdir}/*.rmeta" FILES:${PN}-dbg += "${rustlibdir}/.debug" RUSTLIB = "-L ${STAGING_LIBDIR}/rust" RUST_DEBUG_REMAP = "--remap-path-prefix=${WORKDIR}=/usr/src/debug/${PN}/${EXTENDPE}${PV}-${PR}" RUSTFLAGS += "${RUSTLIB} ${RUST_DEBUG_REMAP}" RUSTLIB_DEP ?= "libstd-rs" export RUST_TARGET_PATH = "${STAGING_LIBDIR_NATIVE}/rustlib" RUST_PANIC_STRATEGY ?= "unwind" # Native builds are not effected by TCLIBC. Without this, rust-native # thinks it's "target" (i.e. x86_64-linux) is a musl target. RUST_LIBC = "${TCLIBC}" RUST_LIBC:class-native = "glibc" def determine_libc(d, thing): '''Determine which libc something should target''' # BUILD is never musl, TARGET may be musl or glibc, # HOST could be musl, but only if a compiler is built to be run on # target in which case HOST_SYS != BUILD_SYS. if thing == 'TARGET': libc = d.getVar('RUST_LIBC') elif thing == 'BUILD' and (d.getVar('HOST_SYS') != d.getVar('BUILD_SYS')): libc = d.getVar('RUST_LIBC') else: libc = d.getVar('RUST_LIBC:class-native') return libc def target_is_armv7(d): '''Determine if target is armv7''' # TUNE_FEATURES may include arm* even if the target is not arm # in the case of *-native packages if d.getVar('TARGET_ARCH') != 'arm': return False feat = d.getVar('TUNE_FEATURES') feat = frozenset(feat.split()) mach_overrides = d.getVar('MACHINEOVERRIDES') mach_overrides = frozenset(mach_overrides.split(':')) v7=frozenset(['armv7a', 'armv7r', 'armv7m', 'armv7ve']) if mach_overrides.isdisjoint(v7) and feat.isdisjoint(v7): return False else: return True target_is_armv7[vardepvalue] = "${@target_is_armv7(d)}" # Responsible for taking Yocto triples and converting it to Rust triples def rust_base_triple(d, thing): ''' Mangle bitbake's *_SYS into something that rust might support (see rust/mk/cfg/* for a list) Note that os is assumed to be some linux form ''' # The llvm-target for armv7 is armv7-unknown-linux-gnueabihf if thing == "TARGET" and target_is_armv7(d): arch = "armv7" else: arch = d.getVar('{}_ARCH'.format(thing)) # All the Yocto targets are Linux and are 'unknown' vendor = "-unknown" os = d.getVar('{}_OS'.format(thing)) libc = determine_libc(d, thing) # Prefix with a dash and convert glibc -> gnu if libc == "glibc": libc = "-gnu" elif libc == "musl": libc = "-musl" # Don't double up musl (only appears to be the case on aarch64) if os == "linux-musl": if libc != "-musl": bb.fatal("{}_OS was '{}' but TCLIBC was not 'musl'".format(thing, os)) os = "linux" # This catches ARM targets and appends the necessary hard float bits if os == "linux-gnueabi" or os == "linux-musleabi": libc = bb.utils.contains('TUNE_FEATURES', 'callconvention-hard', 'hf', '', d) return arch + vendor + '-' + os + libc # Naming explanation # Yocto # - BUILD_SYS - Yocto triple of the build environment # - HOST_SYS - What we're building for in Yocto # - TARGET_SYS - What we're building for in Yocto # # So when building '-native' packages BUILD_SYS == HOST_SYS == TARGET_SYS # When building packages for the image HOST_SYS == TARGET_SYS # This is a gross over simplification as there are other modes but # currently this is all that's supported. # # Rust # - TARGET - the system where the binary will run # - HOST - the system where the binary is being built # # Rust additionally will use two additional cases: # - undecorated (e.g. CC) - equivalent to TARGET # - triple suffix (e.g. CC:x86_64_unknown_linux_gnu) - both # see: https://github.com/alexcrichton/gcc-rs # The way that Rust's internal triples and Yocto triples are mapped together # its likely best to not use the triple suffix due to potential confusion. RUST_BUILD_SYS = "${@rust_base_triple(d, 'BUILD')}" RUST_HOST_SYS = "${@rust_base_triple(d, 'HOST')}" RUST_TARGET_SYS = "${@rust_base_triple(d, 'TARGET')}" # wrappers to get around the fact that Rust needs a single # binary but Yocto's compiler and linker commands have # arguments. Technically the archiver is always one command but # this is necessary for builds that determine the prefix and then # use those commands based on the prefix. WRAPPER_DIR = "${WORKDIR}/wrapper" RUST_BUILD_CC = "${WRAPPER_DIR}/build-rust-cc" RUST_BUILD_CXX = "${WRAPPER_DIR}/build-rust-cxx" RUST_BUILD_CCLD = "${WRAPPER_DIR}/build-rust-ccld" RUST_BUILD_AR = "${WRAPPER_DIR}/build-rust-ar" RUST_TARGET_CC = "${WRAPPER_DIR}/target-rust-cc" RUST_TARGET_CXX = "${WRAPPER_DIR}/target-rust-cxx" RUST_TARGET_CCLD = "${WRAPPER_DIR}/target-rust-ccld" RUST_TARGET_AR = "${WRAPPER_DIR}/target-rust-ar" create_wrapper () { file="$1" shift cat <<- EOF > "${file}" #!/usr/bin/env python3 import os, sys orig_binary = "$@" binary = orig_binary.split()[0] args = orig_binary.split() + sys.argv[1:] os.execvp(binary, args) EOF chmod +x "${file}" } export WRAPPER_TARGET_CC = "${CC}" export WRAPPER_TARGET_CXX = "${CXX}" export WRAPPER_TARGET_CCLD = "${CCLD}" export WRAPPER_TARGET_LDFLAGS = "${LDFLAGS}" export WRAPPER_TARGET_AR = "${AR}" # compiler is used by gcc-rs # linker is used by rustc/cargo # archiver is used by the build of libstd-rs do_rust_create_wrappers () { mkdir -p "${WRAPPER_DIR}" # Yocto Build / Rust Host C compiler create_wrapper "${RUST_BUILD_CC}" "${BUILD_CC}" # Yocto Build / Rust Host C++ compiler create_wrapper "${RUST_BUILD_CXX}" "${BUILD_CXX}" # Yocto Build / Rust Host linker create_wrapper "${RUST_BUILD_CCLD}" "${BUILD_CCLD}" "${BUILD_LDFLAGS}" # Yocto Build / Rust Host archiver create_wrapper "${RUST_BUILD_AR}" "${BUILD_AR}" # Yocto Target / Rust Target C compiler create_wrapper "${RUST_TARGET_CC}" "${WRAPPER_TARGET_CC}" "${WRAPPER_TARGET_LDFLAGS}" # Yocto Target / Rust Target C++ compiler create_wrapper "${RUST_TARGET_CXX}" "${WRAPPER_TARGET_CXX}" # Yocto Target / Rust Target linker create_wrapper "${RUST_TARGET_CCLD}" "${WRAPPER_TARGET_CCLD}" "${WRAPPER_TARGET_LDFLAGS}" # Yocto Target / Rust Target archiver create_wrapper "${RUST_TARGET_AR}" "${WRAPPER_TARGET_AR}" } addtask rust_create_wrappers before do_configure after do_patch do_prepare_recipe_sysroot do_rust_create_wrappers[dirs] += "${WRAPPER_DIR}"