# Common variables used by all Rust builds
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export rustlibdir = "${libdir}/rust"
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FILES:${PN} += "${rustlibdir}/*.so"
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FILES:${PN}-dev += "${rustlibdir}/*.rlib ${rustlibdir}/*.rmeta"
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FILES:${PN}-dbg += "${rustlibdir}/.debug"
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RUSTLIB = "-L ${STAGING_LIBDIR}/rust"
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RUST_DEBUG_REMAP = "--remap-path-prefix=${WORKDIR}=/usr/src/debug/${PN}/${EXTENDPE}${PV}-${PR}"
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RUSTFLAGS += "${RUSTLIB} ${RUST_DEBUG_REMAP}"
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RUSTLIB_DEP ?= "libstd-rs"
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export RUST_TARGET_PATH = "${STAGING_LIBDIR_NATIVE}/rustlib"
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RUST_PANIC_STRATEGY ?= "unwind"
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# Native builds are not effected by TCLIBC. Without this, rust-native
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# thinks it's "target" (i.e. x86_64-linux) is a musl target.
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RUST_LIBC = "${TCLIBC}"
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RUST_LIBC:class-native = "glibc"
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def determine_libc(d, thing):
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'''Determine which libc something should target'''
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# BUILD is never musl, TARGET may be musl or glibc,
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# HOST could be musl, but only if a compiler is built to be run on
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# target in which case HOST_SYS != BUILD_SYS.
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if thing == 'TARGET':
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libc = d.getVar('RUST_LIBC')
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elif thing == 'BUILD' and (d.getVar('HOST_SYS') != d.getVar('BUILD_SYS')):
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libc = d.getVar('RUST_LIBC')
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else:
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libc = d.getVar('RUST_LIBC:class-native')
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return libc
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def target_is_armv7(d):
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'''Determine if target is armv7'''
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# TUNE_FEATURES may include arm* even if the target is not arm
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# in the case of *-native packages
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if d.getVar('TARGET_ARCH') != 'arm':
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return False
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feat = d.getVar('TUNE_FEATURES')
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feat = frozenset(feat.split())
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mach_overrides = d.getVar('MACHINEOVERRIDES')
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mach_overrides = frozenset(mach_overrides.split(':'))
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v7=frozenset(['armv7a', 'armv7r', 'armv7m', 'armv7ve'])
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if mach_overrides.isdisjoint(v7) and feat.isdisjoint(v7):
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return False
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else:
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return True
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target_is_armv7[vardepvalue] = "${@target_is_armv7(d)}"
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|
# Responsible for taking Yocto triples and converting it to Rust triples
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def rust_base_triple(d, thing):
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'''
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Mangle bitbake's *_SYS into something that rust might support (see
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rust/mk/cfg/* for a list)
|
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Note that os is assumed to be some linux form
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'''
|
|
# The llvm-target for armv7 is armv7-unknown-linux-gnueabihf
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if thing == "TARGET" and target_is_armv7(d):
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arch = "armv7"
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else:
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arch = d.getVar('{}_ARCH'.format(thing))
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# All the Yocto targets are Linux and are 'unknown'
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vendor = "-unknown"
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os = d.getVar('{}_OS'.format(thing))
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libc = determine_libc(d, thing)
|
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# Prefix with a dash and convert glibc -> gnu
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if libc == "glibc":
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libc = "-gnu"
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elif libc == "musl":
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libc = "-musl"
|
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# Don't double up musl (only appears to be the case on aarch64)
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if os == "linux-musl":
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if libc != "-musl":
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bb.fatal("{}_OS was '{}' but TCLIBC was not 'musl'".format(thing, os))
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os = "linux"
|
|
# This catches ARM targets and appends the necessary hard float bits
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if os == "linux-gnueabi" or os == "linux-musleabi":
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libc = bb.utils.contains('TUNE_FEATURES', 'callconvention-hard', 'hf', '', d)
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return arch + vendor + '-' + os + libc
|
|
# Naming explanation
|
# Yocto
|
# - BUILD_SYS - Yocto triple of the build environment
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# - 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}"
|
#!/bin/sh
|
exec $@ "\$@"
|
EOF
|
chmod +x "${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}"
|
|
# Need to filter out LD_LIBRARY_PATH from the linker without using shell
|
mv ${RUST_BUILD_CCLD} ${RUST_BUILD_CCLD}.real
|
${BUILD_CC} ${COREBASE}/meta/files/rust-ccld-wrapper.c -o ${RUST_BUILD_CCLD}
|
mv ${RUST_TARGET_CCLD} ${RUST_TARGET_CCLD}.real
|
${BUILD_CC} ${COREBASE}/meta/files/rust-ccld-wrapper.c -o ${RUST_TARGET_CCLD}
|
}
|
|
addtask rust_create_wrappers before do_configure after do_patch do_prepare_recipe_sysroot
|
do_rust_create_wrappers[dirs] += "${WRAPPER_DIR}"
|
