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Diffstat (limited to 'meta/classes/rust-common.bbclass')
| -rw-r--r-- | meta/classes/rust-common.bbclass | 185 |
1 files changed, 185 insertions, 0 deletions
diff --git a/meta/classes/rust-common.bbclass b/meta/classes/rust-common.bbclass new file mode 100644 index 0000000000..65ad677499 --- /dev/null +++ b/meta/classes/rust-common.bbclass @@ -0,0 +1,185 @@ +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 = oe.rust.arch_to_rust_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 + + +# In some cases uname and the toolchain differ on their idea of the arch name +RUST_BUILD_ARCH = "${@oe.rust.arch_to_rust_arch(d.getVar('BUILD_ARCH'))}" + +# Naming explanation +# Yocto +# - BUILD_SYS - Yocto triple of the build environment +# - HOST_SYS - What we're building for in Yocto +# - TARGET_SYS - What we're building for in Yocto +# +# So when building '-native' packages BUILD_SYS == HOST_SYS == TARGET_SYS +# When building packages for the image HOST_SYS == TARGET_SYS +# This is a gross over simplification as there are other modes but +# currently this is all that's supported. +# +# Rust +# - TARGET - the system where the binary will run +# - HOST - the system where the binary is being built +# +# Rust additionally will use two additional cases: +# - undecorated (e.g. CC) - equivalent to TARGET +# - triple suffix (e.g. CC:x86_64_unknown_linux_gnu) - both +# see: https://github.com/alexcrichton/gcc-rs +# The way that Rust's internal triples and Yocto triples are mapped together +# its likely best to not use the triple suffix due to potential confusion. + +RUST_BUILD_SYS = "${@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}" |