1# 2# Copyright OpenEmbedded Contributors 3# 4# SPDX-License-Identifier: MIT 5# 6 7inherit python3native 8inherit rust-target-config 9 10# Common variables used by all Rust builds 11export rustlibdir = "${libdir}/rustlib/${RUST_HOST_SYS}/lib" 12FILES:${PN} += "${rustlibdir}/*.so" 13FILES:${PN}-dev += "${rustlibdir}/*.rlib ${rustlibdir}/*.rmeta" 14FILES:${PN}-dbg += "${rustlibdir}/.debug" 15 16RUSTLIB = "-L ${STAGING_DIR_HOST}${rustlibdir}" 17RUST_DEBUG_REMAP = "--remap-path-prefix=${WORKDIR}=${TARGET_DBGSRC_DIR}" 18RUSTFLAGS += "${RUSTLIB} ${RUST_DEBUG_REMAP}" 19RUSTLIB_DEP ??= "libstd-rs" 20RUST_PANIC_STRATEGY ??= "unwind" 21 22def target_is_armv7(d): 23 '''Determine if target is armv7''' 24 # TUNE_FEATURES may include arm* even if the target is not arm 25 # in the case of *-native packages 26 if d.getVar('TARGET_ARCH') != 'arm': 27 return False 28 29 feat = d.getVar('TUNE_FEATURES') 30 feat = frozenset(feat.split()) 31 mach_overrides = d.getVar('MACHINEOVERRIDES') 32 mach_overrides = frozenset(mach_overrides.split(':')) 33 34 v7=frozenset(['armv7a', 'armv7r', 'armv7m', 'armv7ve']) 35 if mach_overrides.isdisjoint(v7) and feat.isdisjoint(v7): 36 return False 37 else: 38 return True 39target_is_armv7[vardepvalue] = "${@target_is_armv7(d)}" 40 41# Responsible for taking Yocto triples and converting it to Rust triples 42def rust_base_triple(d, thing): 43 ''' 44 Mangle bitbake's *_SYS into something that rust might support (see 45 rust/mk/cfg/* for a list) 46 47 Note that os is assumed to be some linux form 48 ''' 49 50 # The llvm-target for armv7 is armv7-unknown-linux-gnueabihf 51 if d.getVar('{}_ARCH'.format(thing)) == d.getVar('TARGET_ARCH') and target_is_armv7(d): 52 arch = "armv7" 53 else: 54 arch = oe.rust.arch_to_rust_arch(d.getVar('{}_ARCH'.format(thing))) 55 56 # Substituting "unknown" when vendor is empty will match rust's standard 57 # targets when building native recipes (including rust-native itself) 58 vendor = d.getVar('{}_VENDOR'.format(thing)) or "-unknown" 59 60 # Default to glibc 61 libc = "-gnu" 62 os = d.getVar('{}_OS'.format(thing)) 63 # This catches ARM targets and appends the necessary hard float bits 64 if os == "linux-gnueabi" or os == "linux-musleabi": 65 libc = bb.utils.contains('TUNE_FEATURES', 'callconvention-hard', 'hf', '', d) 66 elif os == "linux-gnux32" or os == "linux-muslx32": 67 libc = "" 68 elif "musl" in os: 69 libc = "-musl" 70 os = "linux" 71 elif "elf" in os: 72 libc = "-elf" 73 os = "none" 74 elif "eabi" in os: 75 libc = "-eabi" 76 os = "none" 77 78 return arch + vendor + '-' + os + libc 79 80 81# In some cases uname and the toolchain differ on their idea of the arch name 82RUST_BUILD_ARCH = "${@oe.rust.arch_to_rust_arch(d.getVar('BUILD_ARCH'))}" 83 84# Naming explanation 85# Yocto 86# - BUILD_SYS - Yocto triple of the build environment 87# - HOST_SYS - What we're building for in Yocto 88# - TARGET_SYS - What we're building for in Yocto 89# 90# So when building '-native' packages BUILD_SYS == HOST_SYS == TARGET_SYS 91# When building packages for the image HOST_SYS == TARGET_SYS 92# This is a gross over simplification as there are other modes but 93# currently this is all that's supported. 94# 95# Rust 96# - TARGET - the system where the binary will run 97# - HOST - the system where the binary is being built 98# 99# Rust additionally will use two additional cases: 100# - undecorated (e.g. CC) - equivalent to TARGET 101# - triple suffix (e.g. CC:x86_64_unknown_linux_gnu) - both 102# see: https://github.com/rust-lang/cc-rs 103# The way that Rust's internal triples and Yocto triples are mapped together 104# its likely best to not use the triple suffix due to potential confusion. 105 106RUST_BUILD_SYS = "${@rust_base_triple(d, 'BUILD')}" 107RUST_BUILD_SYS[vardepvalue] = "${RUST_BUILD_SYS}" 108RUST_HOST_SYS = "${@rust_base_triple(d, 'HOST')}" 109RUST_HOST_SYS[vardepvalue] = "${RUST_HOST_SYS}" 110RUST_TARGET_SYS = "${@rust_base_triple(d, 'TARGET')}" 111RUST_TARGET_SYS[vardepvalue] = "${RUST_TARGET_SYS}" 112 113# wrappers to get around the fact that Rust needs a single 114# binary but Yocto's compiler and linker commands have 115# arguments. Technically the archiver is always one command but 116# this is necessary for builds that determine the prefix and then 117# use those commands based on the prefix. 118WRAPPER_DIR = "${WORKDIR}/wrapper" 119RUST_BUILD_CC = "${WRAPPER_DIR}/build-rust-cc" 120RUST_BUILD_CXX = "${WRAPPER_DIR}/build-rust-cxx" 121RUST_BUILD_CCLD = "${WRAPPER_DIR}/build-rust-ccld" 122RUST_BUILD_AR = "${WRAPPER_DIR}/build-rust-ar" 123RUST_TARGET_CC = "${WRAPPER_DIR}/target-rust-cc" 124RUST_TARGET_CXX = "${WRAPPER_DIR}/target-rust-cxx" 125RUST_TARGET_CCLD = "${WRAPPER_DIR}/target-rust-ccld" 126RUST_TARGET_AR = "${WRAPPER_DIR}/target-rust-ar" 127 128create_wrapper_rust () { 129 file="$1" 130 shift 131 extras="$1" 132 shift 133 crate_cc_extras="$1" 134 shift 135 136 cat <<- EOF > "${file}" 137 #!/usr/bin/env python3 138 import os, sys 139 orig_binary = "$@" 140 extras = "${extras}" 141 142 # Apply a required subset of CC crate compiler flags 143 # when we build a target recipe for a non-bare-metal target. 144 # https://github.com/rust-lang/cc-rs/blob/main/src/lib.rs#L1614 145 if "CRATE_CC_NO_DEFAULTS" in os.environ.keys() and \ 146 "TARGET" in os.environ.keys() and not "-none-" in os.environ["TARGET"]: 147 orig_binary += "${crate_cc_extras}" 148 149 binary = orig_binary.split()[0] 150 args = orig_binary.split() + sys.argv[1:] 151 if extras: 152 args.append(extras) 153 os.execvp(binary, args) 154 EOF 155 chmod +x "${file}" 156} 157 158WRAPPER_TARGET_CC = "${CC}" 159WRAPPER_TARGET_CXX = "${CXX}" 160WRAPPER_TARGET_CCLD = "${CCLD}" 161WRAPPER_TARGET_LDFLAGS = "${LDFLAGS}" 162WRAPPER_TARGET_EXTRALD = "" 163# see recipes-devtools/gcc/gcc/0018-Add-ssp_nonshared-to-link-commandline-for-musl-targe.patch 164# we need to link with ssp_nonshared on musl to avoid "undefined reference to `__stack_chk_fail_local'" 165# when building MACHINE=qemux86 for musl 166WRAPPER_TARGET_EXTRALD:libc-musl = "-lssp_nonshared" 167WRAPPER_TARGET_AR = "${AR}" 168 169# compiler is used by gcc-rs 170# linker is used by rustc/cargo 171# archiver is used by the build of libstd-rs 172do_rust_create_wrappers () { 173 mkdir -p "${WRAPPER_DIR}" 174 175 # Yocto Build / Rust Host C compiler 176 create_wrapper_rust "${RUST_BUILD_CC}" "" "${CRATE_CC_FLAGS}" "${BUILD_CC}" 177 # Yocto Build / Rust Host C++ compiler 178 create_wrapper_rust "${RUST_BUILD_CXX}" "" "${CRATE_CC_FLAGS}" "${BUILD_CXX}" 179 # Yocto Build / Rust Host linker 180 create_wrapper_rust "${RUST_BUILD_CCLD}" "" "" "${BUILD_CCLD}" "${BUILD_LDFLAGS}" 181 # Yocto Build / Rust Host archiver 182 create_wrapper_rust "${RUST_BUILD_AR}" "" "" "${BUILD_AR}" 183 184 # Yocto Target / Rust Target C compiler 185 create_wrapper_rust "${RUST_TARGET_CC}" "${WRAPPER_TARGET_EXTRALD}" "${CRATE_CC_FLAGS}" "${WRAPPER_TARGET_CC}" "${WRAPPER_TARGET_LDFLAGS}" 186 # Yocto Target / Rust Target C++ compiler 187 create_wrapper_rust "${RUST_TARGET_CXX}" "${WRAPPER_TARGET_EXTRALD}" "${CRATE_CC_FLAGS}" "${WRAPPER_TARGET_CXX}" "${CXXFLAGS}" 188 # Yocto Target / Rust Target linker 189 create_wrapper_rust "${RUST_TARGET_CCLD}" "${WRAPPER_TARGET_EXTRALD}" "" "${WRAPPER_TARGET_CCLD}" "${WRAPPER_TARGET_LDFLAGS}" 190 # Yocto Target / Rust Target archiver 191 create_wrapper_rust "${RUST_TARGET_AR}" "" "" "${WRAPPER_TARGET_AR}" 192 193} 194 195addtask rust_create_wrappers before do_configure after do_patch do_prepare_recipe_sysroot 196do_rust_create_wrappers[dirs] += "${WRAPPER_DIR}" 197