poky/meta/classes-recipe/rust-target-config.bbclass - mdmillerii/openbmc - Gitiles

 #
 # Copyright OpenEmbedded Contributors
 #
 # SPDX-License-Identifier: MIT
 #

 # Right now this is focused on arm-specific tune features.
 # We get away with this for now as one can only use x86-64 as the build host
 # (not arm).
 # Note that TUNE_FEATURES is _always_ refering to the target, so we really
 # don't want to use this for the host/build.
 def llvm_features_from_tune(d):
     f = []
     feat = d.getVar('TUNE_FEATURES')
     if not feat:
         return []
     feat = frozenset(feat.split())

     mach_overrides = d.getVar('MACHINEOVERRIDES')
     mach_overrides = frozenset(mach_overrides.split(':'))

     if 'vfpv4' in feat:
         f.append("+vfp4")
     elif 'vfpv3' in feat:
         f.append("+vfp3")
     elif 'vfpv3d16' in feat:
         f.append("+vfp3")
         f.append("-d32")
     elif 'vfpv2' in feat or 'vfp' in feat:
         f.append("+vfp2")

     if 'neon' in feat:
         f.append("+neon")
     elif target_is_armv7(d):
         f.append("-neon")

     if 'mips32' in feat:
         f.append("+mips32")

     if 'mips32r2' in feat:
         f.append("+mips32r2")

     if target_is_armv7(d):
         f.append('+v7')

     if ('armv6' in mach_overrides) or ('armv6' in feat):
         f.append("+v6")
     if 'armv5te' in feat:
         f.append("+strict-align")
         f.append("+v5te")
     elif 'armv5' in feat:
         f.append("+strict-align")
         f.append("+v5")

     if ('armv4' in mach_overrides) or ('armv4' in feat):
         f.append("+strict-align")

     if 'dsp' in feat:
         f.append("+dsp")

     if 'thumb' in feat:
         if d.getVar('ARM_THUMB_OPT') == "thumb":
             if target_is_armv7(d):
                 f.append('+thumb2')
             f.append("+thumb-mode")

     if 'cortexa5' in feat:
         f.append("+a5")
     if 'cortexa7' in feat:
         f.append("+a7")
     if 'cortexa9' in feat:
         f.append("+a9")
     if 'cortexa15' in feat:
         f.append("+a15")
     if 'cortexa17' in feat:
         f.append("+a17")
     if ('riscv64' in feat) or ('riscv32' in feat):
         f.append("+a,+c,+d,+f,+m")
     return f
 llvm_features_from_tune[vardepvalue] = "${@llvm_features_from_tune(d)}"

 # TARGET_CC_ARCH changes from build/cross/target so it'll do the right thing
 # this should go away when https://github.com/rust-lang/rust/pull/31709 is
 # stable (1.9.0?)
 def llvm_features_from_cc_arch(d):
     f = []
     feat = d.getVar('TARGET_CC_ARCH')
     if not feat:
         return []
     feat = frozenset(feat.split())

     if '-mmmx' in feat:
         f.append("+mmx")
     if '-msse' in feat:
         f.append("+sse")
     if '-msse2' in feat:
         f.append("+sse2")
     if '-msse3' in feat:
         f.append("+sse3")
     if '-mssse3' in feat:
         f.append("+ssse3")
     if '-msse4.1' in feat:
         f.append("+sse4.1")
     if '-msse4.2' in feat:
         f.append("+sse4.2")
     if '-msse4a' in feat:
         f.append("+sse4a")
     if '-mavx' in feat:
         f.append("+avx")
     if '-mavx2' in feat:
         f.append("+avx2")

     return f

 def llvm_features_from_target_fpu(d):
     # TARGET_FPU can be hard or soft. +soft-float tell llvm to use soft float
     # ABI. There is no option for hard.

     fpu = d.getVar('TARGET_FPU')
     return ["+soft-float"] if fpu == "soft" else []

 def llvm_features(d):
     return ','.join(llvm_features_from_tune(d) +
                     llvm_features_from_cc_arch(d) +
                     llvm_features_from_target_fpu(d))

 llvm_features[vardepvalue] = "${@llvm_features(d)}"

 ## arm-unknown-linux-gnueabihf
 DATA_LAYOUT[arm-eabi] = "e-m:e-p:32:32-i64:64-v128:64:128-a:0:32-n32-S64"
 TARGET_ENDIAN[arm-eabi] = "little"
 TARGET_POINTER_WIDTH[arm-eabi] = "32"
 TARGET_C_INT_WIDTH[arm-eabi] = "32"
 MAX_ATOMIC_WIDTH[arm-eabi] = "64"
 FEATURES[arm-eabi] = "+v6,+vfp2"

 ## armv7-unknown-linux-gnueabihf
 DATA_LAYOUT[armv7-eabi] = "e-m:e-p:32:32-i64:64-v128:64:128-a:0:32-n32-S64"
 TARGET_ENDIAN[armv7-eabi] = "little"
 TARGET_POINTER_WIDTH[armv7-eabi] = "32"
 TARGET_C_INT_WIDTH[armv7-eabi] = "32"
 MAX_ATOMIC_WIDTH[armv7-eabi] = "64"
 FEATURES[armv7-eabi] = "+v7,+vfp2,+thumb2"

 ## aarch64-unknown-linux-{gnu, musl}
 DATA_LAYOUT[aarch64] = "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128"
 TARGET_ENDIAN[aarch64] = "little"
 TARGET_POINTER_WIDTH[aarch64] = "64"
 TARGET_C_INT_WIDTH[aarch64] = "32"
 MAX_ATOMIC_WIDTH[aarch64] = "128"

 ## x86_64-unknown-linux-{gnu, musl}
 DATA_LAYOUT[x86_64] = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
 TARGET_ENDIAN[x86_64] = "little"
 TARGET_POINTER_WIDTH[x86_64] = "64"
 TARGET_C_INT_WIDTH[x86_64] = "32"
 MAX_ATOMIC_WIDTH[x86_64] = "64"

 ## x86_64-unknown-linux-gnux32
 DATA_LAYOUT[x86_64-x32] = "e-m:e-p:32:32-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
 TARGET_ENDIAN[x86_64-x32] = "little"
 TARGET_POINTER_WIDTH[x86_64-x32] = "32"
 TARGET_C_INT_WIDTH[x86_64-x32] = "32"
 MAX_ATOMIC_WIDTH[x86_64-x32] = "64"

 ## i686-unknown-linux-{gnu, musl}
 DATA_LAYOUT[i686] = "e-m:e-p:32:32-f64:32:64-f80:32-n8:16:32-S128"
 TARGET_ENDIAN[i686] = "little"
 TARGET_POINTER_WIDTH[i686] = "32"
 TARGET_C_INT_WIDTH[i686] = "32"
 MAX_ATOMIC_WIDTH[i686] = "64"

 ## XXX: a bit of a hack so qemux86 builds, clone of i686-unknown-linux-{gnu, musl} above
 DATA_LAYOUT[i586] = "e-m:e-p:32:32-f64:32:64-f80:32-n8:16:32-S128"
 TARGET_ENDIAN[i586] = "little"
 TARGET_POINTER_WIDTH[i586] = "32"
 TARGET_C_INT_WIDTH[i586] = "32"
 MAX_ATOMIC_WIDTH[i586] = "64"

 ## mips-unknown-linux-{gnu, musl}
 DATA_LAYOUT[mips] = "E-m:m-p:32:32-i8:8:32-i16:16:32-i64:64-n32-S64"
 TARGET_ENDIAN[mips] = "big"
 TARGET_POINTER_WIDTH[mips] = "32"
 TARGET_C_INT_WIDTH[mips] = "32"
 MAX_ATOMIC_WIDTH[mips] = "32"

 ## mipsel-unknown-linux-{gnu, musl}
 DATA_LAYOUT[mipsel] = "e-m:m-p:32:32-i8:8:32-i16:16:32-i64:64-n32-S64"
 TARGET_ENDIAN[mipsel] = "little"
 TARGET_POINTER_WIDTH[mipsel] = "32"
 TARGET_C_INT_WIDTH[mipsel] = "32"
 MAX_ATOMIC_WIDTH[mipsel] = "32"

 ## mips64-unknown-linux-{gnu, musl}
 DATA_LAYOUT[mips64] = "E-m:e-i8:8:32-i16:16:32-i64:64-n32:64-S128"
 TARGET_ENDIAN[mips64] = "big"
 TARGET_POINTER_WIDTH[mips64] = "64"
 TARGET_C_INT_WIDTH[mips64] = "64"
 MAX_ATOMIC_WIDTH[mips64] = "64"

 ## mips64-n32-unknown-linux-{gnu, musl}
 DATA_LAYOUT[mips64-n32] = "E-m:e-p:32:32-i8:8:32-i16:16:32-i64:64-n32:64-S128"
 TARGET_ENDIAN[mips64-n32] = "big"
 TARGET_POINTER_WIDTH[mips64-n32] = "32"
 TARGET_C_INT_WIDTH[mips64-n32] = "32"
 MAX_ATOMIC_WIDTH[mips64-n32] = "64"

 ## mips64el-unknown-linux-{gnu, musl}
 DATA_LAYOUT[mips64el] = "e-m:e-i8:8:32-i16:16:32-i64:64-n32:64-S128"
 TARGET_ENDIAN[mips64el] = "little"
 TARGET_POINTER_WIDTH[mips64el] = "64"
 TARGET_C_INT_WIDTH[mips64el] = "64"
 MAX_ATOMIC_WIDTH[mips64el] = "64"

 ## powerpc-unknown-linux-{gnu, musl}
 DATA_LAYOUT[powerpc] = "E-m:e-p:32:32-i64:64-n32"
 TARGET_ENDIAN[powerpc] = "big"
 TARGET_POINTER_WIDTH[powerpc] = "32"
 TARGET_C_INT_WIDTH[powerpc] = "32"
 MAX_ATOMIC_WIDTH[powerpc] = "32"

 ## powerpc64-unknown-linux-{gnu, musl}
 DATA_LAYOUT[powerpc64] = "E-m:e-i64:64-n32:64-S128-v256:256:256-v512:512:512"
 TARGET_ENDIAN[powerpc64] = "big"
 TARGET_POINTER_WIDTH[powerpc64] = "64"
 TARGET_C_INT_WIDTH[powerpc64] = "64"
 MAX_ATOMIC_WIDTH[powerpc64] = "64"

 ## powerpc64le-unknown-linux-{gnu, musl}
 DATA_LAYOUT[powerpc64le] = "e-m:e-i64:64-n32:64-v256:256:256-v512:512:512"
 TARGET_ENDIAN[powerpc64le] = "little"
 TARGET_POINTER_WIDTH[powerpc64le] = "64"
 TARGET_C_INT_WIDTH[powerpc64le] = "64"
 MAX_ATOMIC_WIDTH[powerpc64le] = "64"

 ## riscv32gc-unknown-linux-{gnu, musl}
 DATA_LAYOUT[riscv32gc] = "e-m:e-p:32:32-i64:64-n32-S128"
 TARGET_ENDIAN[riscv32gc] = "little"
 TARGET_POINTER_WIDTH[riscv32gc] = "32"
 TARGET_C_INT_WIDTH[riscv32gc] = "32"
 MAX_ATOMIC_WIDTH[riscv32gc] = "32"

 ## riscv64gc-unknown-linux-{gnu, musl}
 DATA_LAYOUT[riscv64gc] = "e-m:e-p:64:64-i64:64-i128:128-n64-S128"
 TARGET_ENDIAN[riscv64gc] = "little"
 TARGET_POINTER_WIDTH[riscv64gc] = "64"
 TARGET_C_INT_WIDTH[riscv64gc] = "64"
 MAX_ATOMIC_WIDTH[riscv64gc] = "64"

 ## loongarch64-unknown-linux-{gnu, musl}
 DATA_LAYOUT[loongarch64] = "e-m:e-i8:8:32-i16:16:32-i64:64-n32:64-S128"
 TARGET_ENDIAN[loongarch64] = "little"
 TARGET_POINTER_WIDTH[loongarch64] = "64"
 TARGET_C_INT_WIDTH[loongarch64] = "32"
 MAX_ATOMIC_WIDTH[loongarch64] = "64"
 FEATURES[loongarch64] = "+d"

 # Convert a normal arch (HOST_ARCH, TARGET_ARCH, BUILD_ARCH, etc) to something
 # rust's internals won't choke on.
 def arch_to_rust_target_arch(arch):
     if arch == "i586" or arch == "i686":
         return "x86"
     elif arch == "mipsel":
         return "mips"
     elif arch == "mip64sel":
         return "mips64"
     elif arch == "armv7":
         return "arm"
     elif arch == "powerpc64le":
         return "powerpc64"
     elif arch == "riscv32gc":
         return "riscv32"
     elif arch == "riscv64gc":
         return "riscv64"
     else:
         return arch

 # Convert a rust target string to a llvm-compatible triplet
 def rust_sys_to_llvm_target(sys):
     if sys.startswith('riscv32gc-'):
         return sys.replace('riscv32gc-', 'riscv32-', 1)
     if sys.startswith('riscv64gc-'):
         return sys.replace('riscv64gc-', 'riscv64-', 1)
     return sys

 # generates our target CPU value
 def llvm_cpu(d):
     cpu = d.getVar('PACKAGE_ARCH')
     target = d.getVar('TRANSLATED_TARGET_ARCH')

     trans = {}
     trans['corei7-64'] = "corei7"
     trans['core2-32'] = "core2"
     trans['x86-64'] = "x86-64"
     trans['i686'] = "i686"
     trans['i586'] = "i586"
     trans['mips64'] = "mips64"
     trans['mips64el'] = "mips64"
     trans['powerpc64le'] = "ppc64le"
     trans['powerpc64'] = "ppc64"
     trans['riscv64'] = "generic-rv64"
     trans['riscv32'] = "generic-rv32"
     trans['loongarch64'] = "la464"

     if target in ["mips", "mipsel", "powerpc"]:
         feat = frozenset(d.getVar('TUNE_FEATURES').split())
         if "mips32r2" in feat:
             trans['mipsel'] = "mips32r2"
             trans['mips'] = "mips32r2"
         elif "mips32" in feat:
             trans['mipsel'] = "mips32"
             trans['mips'] = "mips32"
         elif "ppc7400" in feat:
             trans['powerpc'] = "7400"

     try:
         return trans[cpu]
     except:
         return trans.get(target, "generic")

 llvm_cpu[vardepvalue] = "${@llvm_cpu(d)}"

 def rust_gen_target(d, thing, wd, arch):
     import json

     build_sys = d.getVar('BUILD_SYS')
     target_sys = d.getVar('TARGET_SYS')

     sys = d.getVar('{}_SYS'.format(thing))
     prefix = d.getVar('{}_PREFIX'.format(thing))
     rustsys = d.getVar('RUST_{}_SYS'.format(thing))

     abi = None
     cpu = "generic"
     features = ""

     # Need to apply the target tuning consitently, only if the triplet applies to the target
     # and not in the native case
     if sys == target_sys and sys != build_sys:
         abi = d.getVar('ABIEXTENSION')
         cpu = llvm_cpu(d)
         if bb.data.inherits_class('native', d):
             features = ','.join(llvm_features_from_cc_arch(d))
         else:
             features = llvm_features(d) or ""
         # arm and armv7 have different targets in llvm
         if arch == "arm" and target_is_armv7(d):
             arch = 'armv7'

     rust_arch = oe.rust.arch_to_rust_arch(arch)

     if abi:
         arch_abi = "{}-{}".format(rust_arch, abi)
     else:
         arch_abi = rust_arch

     features = features or d.getVarFlag('FEATURES', arch_abi) or ""
     features = features.strip()

     # build tspec
     tspec = {}
     tspec['llvm-target'] = rust_sys_to_llvm_target(rustsys)
     tspec['data-layout'] = d.getVarFlag('DATA_LAYOUT', arch_abi)
     if tspec['data-layout'] is None:
         bb.fatal("No rust target defined for %s" % arch_abi)
     tspec['max-atomic-width'] = int(d.getVarFlag('MAX_ATOMIC_WIDTH', arch_abi))
     tspec['target-pointer-width'] = d.getVarFlag('TARGET_POINTER_WIDTH', arch_abi)
     tspec['target-c-int-width'] = d.getVarFlag('TARGET_C_INT_WIDTH', arch_abi)
     tspec['target-endian'] = d.getVarFlag('TARGET_ENDIAN', arch_abi)
     tspec['arch'] = arch_to_rust_target_arch(rust_arch)
     if "baremetal" in d.getVar('TCLIBC'):
         tspec['os'] = "none"
     else:
         tspec['os'] = "linux"
     if "musl" in tspec['llvm-target']:
         tspec['env'] = "musl"
     else:
         tspec['env'] = "gnu"
     if "riscv64" in tspec['llvm-target']:
         tspec['llvm-abiname'] = "lp64d"
     if "riscv32" in tspec['llvm-target']:
         tspec['llvm-abiname'] = "ilp32d"
     if "loongarch64" in tspec['llvm-target']:
         tspec['llvm-abiname'] = "lp64d"
     tspec['vendor'] = "unknown"
     tspec['target-family'] = "unix"
     tspec['linker'] = "{}{}gcc".format(d.getVar('CCACHE'), prefix)
     tspec['cpu'] = cpu
     if features != "":
         tspec['features'] = features
     tspec['dynamic-linking'] = True
     tspec['executables'] = True
     tspec['linker-is-gnu'] = True
     tspec['linker-flavor'] = "gcc"
     tspec['has-rpath'] = True
     tspec['position-independent-executables'] = True
     tspec['panic-strategy'] = d.getVar("RUST_PANIC_STRATEGY")

     # write out the target spec json file
     with open(wd + rustsys + '.json', 'w') as f:
         json.dump(tspec, f, indent=4)

 # These are accounted for in tmpdir path names so don't need to be in the task sig
 rust_gen_target[vardepsexclude] += "ABIEXTENSION llvm_cpu"

 do_rust_gen_targets[vardeps] += "DATA_LAYOUT TARGET_ENDIAN TARGET_POINTER_WIDTH TARGET_C_INT_WIDTH MAX_ATOMIC_WIDTH FEATURES"

 RUST_TARGETS_DIR = "${WORKDIR}/rust-targets/"
 export RUST_TARGET_PATH = "${RUST_TARGETS_DIR}"

 python do_rust_gen_targets () {
     wd = d.getVar('RUST_TARGETS_DIR')
     # Order of BUILD, HOST, TARGET is important in case the files overwrite, most specific last
     rust_gen_target(d, 'BUILD', wd, d.getVar('BUILD_ARCH'))
     rust_gen_target(d, 'HOST', wd, d.getVar('HOST_ARCH'))
     rust_gen_target(d, 'TARGET', wd, d.getVar('TARGET_ARCH'))
 }

 addtask rust_gen_targets after do_patch before do_compile
 do_rust_gen_targets[dirs] += "${RUST_TARGETS_DIR}"

 # For building target C dependecies use only compiler parameters defined in OE
 # and ignore the CC crate defaults which conflicts with OE ones in some cases.
 # https://github.com/rust-lang/cc-rs#external-configuration-via-environment-variables
 # Some CC crate compiler flags are still required.
 # We apply them conditionally in rust wrappers.

 CRATE_CC_FLAGS:class-native = ""
 CRATE_CC_FLAGS:class-nativesdk = ""
 CRATE_CC_FLAGS:class-target = " -ffunction-sections -fdata-sections -fPIC"

 do_compile:prepend:class-target() {
     export CRATE_CC_NO_DEFAULTS=1
 }
 do_install:prepend:class-target() {
     export CRATE_CC_NO_DEFAULTS=1
 }
	#
	# Copyright OpenEmbedded Contributors
	#
	# SPDX-License-Identifier: MIT
	#

	# Right now this is focused on arm-specific tune features.
	# We get away with this for now as one can only use x86-64 as the build host
	# (not arm).
	# Note that TUNE_FEATURES is _always_ refering to the target, so we really
	# don't want to use this for the host/build.
	def llvm_features_from_tune(d):
	f = []
	feat = d.getVar('TUNE_FEATURES')
	if not feat:
	return []
	feat = frozenset(feat.split())

	mach_overrides = d.getVar('MACHINEOVERRIDES')
	mach_overrides = frozenset(mach_overrides.split(':'))

	if 'vfpv4' in feat:
	f.append("+vfp4")
	elif 'vfpv3' in feat:
	f.append("+vfp3")
	elif 'vfpv3d16' in feat:
	f.append("+vfp3")
	f.append("-d32")
	elif 'vfpv2' in feat or 'vfp' in feat:
	f.append("+vfp2")

	if 'neon' in feat:
	f.append("+neon")
	elif target_is_armv7(d):
	f.append("-neon")

	if 'mips32' in feat:
	f.append("+mips32")

	if 'mips32r2' in feat:
	f.append("+mips32r2")

	if target_is_armv7(d):
	f.append('+v7')

	if ('armv6' in mach_overrides) or ('armv6' in feat):
	f.append("+v6")
	if 'armv5te' in feat:
	f.append("+strict-align")
	f.append("+v5te")
	elif 'armv5' in feat:
	f.append("+strict-align")
	f.append("+v5")

	if ('armv4' in mach_overrides) or ('armv4' in feat):
	f.append("+strict-align")

	if 'dsp' in feat:
	f.append("+dsp")

	if 'thumb' in feat:
	if d.getVar('ARM_THUMB_OPT') == "thumb":
	if target_is_armv7(d):
	f.append('+thumb2')
	f.append("+thumb-mode")

	if 'cortexa5' in feat:
	f.append("+a5")
	if 'cortexa7' in feat:
	f.append("+a7")
	if 'cortexa9' in feat:
	f.append("+a9")
	if 'cortexa15' in feat:
	f.append("+a15")
	if 'cortexa17' in feat:
	f.append("+a17")
	if ('riscv64' in feat) or ('riscv32' in feat):
	f.append("+a,+c,+d,+f,+m")
	return f
	llvm_features_from_tune[vardepvalue] = "${@llvm_features_from_tune(d)}"

	# TARGET_CC_ARCH changes from build/cross/target so it'll do the right thing
	# this should go away when https://github.com/rust-lang/rust/pull/31709 is
	# stable (1.9.0?)
	def llvm_features_from_cc_arch(d):
	f = []
	feat = d.getVar('TARGET_CC_ARCH')
	if not feat:
	return []
	feat = frozenset(feat.split())

	if '-mmmx' in feat:
	f.append("+mmx")
	if '-msse' in feat:
	f.append("+sse")
	if '-msse2' in feat:
	f.append("+sse2")
	if '-msse3' in feat:
	f.append("+sse3")
	if '-mssse3' in feat:
	f.append("+ssse3")
	if '-msse4.1' in feat:
	f.append("+sse4.1")
	if '-msse4.2' in feat:
	f.append("+sse4.2")
	if '-msse4a' in feat:
	f.append("+sse4a")
	if '-mavx' in feat:
	f.append("+avx")
	if '-mavx2' in feat:
	f.append("+avx2")

	return f

	def llvm_features_from_target_fpu(d):
	# TARGET_FPU can be hard or soft. +soft-float tell llvm to use soft float
	# ABI. There is no option for hard.

	fpu = d.getVar('TARGET_FPU')
	return ["+soft-float"] if fpu == "soft" else []

	def llvm_features(d):
	return ','.join(llvm_features_from_tune(d) +
	llvm_features_from_cc_arch(d) +
	llvm_features_from_target_fpu(d))

	llvm_features[vardepvalue] = "${@llvm_features(d)}"

	## arm-unknown-linux-gnueabihf
	DATA_LAYOUT[arm-eabi] = "e-m:e-p:32:32-i64:64-v128:64:128-a:0:32-n32-S64"
	TARGET_ENDIAN[arm-eabi] = "little"
	TARGET_POINTER_WIDTH[arm-eabi] = "32"
	TARGET_C_INT_WIDTH[arm-eabi] = "32"
	MAX_ATOMIC_WIDTH[arm-eabi] = "64"
	FEATURES[arm-eabi] = "+v6,+vfp2"

	## armv7-unknown-linux-gnueabihf
	DATA_LAYOUT[armv7-eabi] = "e-m:e-p:32:32-i64:64-v128:64:128-a:0:32-n32-S64"
	TARGET_ENDIAN[armv7-eabi] = "little"
	TARGET_POINTER_WIDTH[armv7-eabi] = "32"
	TARGET_C_INT_WIDTH[armv7-eabi] = "32"
	MAX_ATOMIC_WIDTH[armv7-eabi] = "64"
	FEATURES[armv7-eabi] = "+v7,+vfp2,+thumb2"

	## aarch64-unknown-linux-{gnu, musl}
	DATA_LAYOUT[aarch64] = "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128"
	TARGET_ENDIAN[aarch64] = "little"
	TARGET_POINTER_WIDTH[aarch64] = "64"
	TARGET_C_INT_WIDTH[aarch64] = "32"
	MAX_ATOMIC_WIDTH[aarch64] = "128"

	## x86_64-unknown-linux-{gnu, musl}
	DATA_LAYOUT[x86_64] = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
	TARGET_ENDIAN[x86_64] = "little"
	TARGET_POINTER_WIDTH[x86_64] = "64"
	TARGET_C_INT_WIDTH[x86_64] = "32"
	MAX_ATOMIC_WIDTH[x86_64] = "64"

	## x86_64-unknown-linux-gnux32
	DATA_LAYOUT[x86_64-x32] = "e-m:e-p:32:32-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
	TARGET_ENDIAN[x86_64-x32] = "little"
	TARGET_POINTER_WIDTH[x86_64-x32] = "32"
	TARGET_C_INT_WIDTH[x86_64-x32] = "32"
	MAX_ATOMIC_WIDTH[x86_64-x32] = "64"

	## i686-unknown-linux-{gnu, musl}
	DATA_LAYOUT[i686] = "e-m:e-p:32:32-f64:32:64-f80:32-n8:16:32-S128"
	TARGET_ENDIAN[i686] = "little"
	TARGET_POINTER_WIDTH[i686] = "32"
	TARGET_C_INT_WIDTH[i686] = "32"
	MAX_ATOMIC_WIDTH[i686] = "64"

	## XXX: a bit of a hack so qemux86 builds, clone of i686-unknown-linux-{gnu, musl} above
	DATA_LAYOUT[i586] = "e-m:e-p:32:32-f64:32:64-f80:32-n8:16:32-S128"
	TARGET_ENDIAN[i586] = "little"
	TARGET_POINTER_WIDTH[i586] = "32"
	TARGET_C_INT_WIDTH[i586] = "32"
	MAX_ATOMIC_WIDTH[i586] = "64"

	## mips-unknown-linux-{gnu, musl}
	DATA_LAYOUT[mips] = "E-m:m-p:32:32-i8:8:32-i16:16:32-i64:64-n32-S64"
	TARGET_ENDIAN[mips] = "big"
	TARGET_POINTER_WIDTH[mips] = "32"
	TARGET_C_INT_WIDTH[mips] = "32"
	MAX_ATOMIC_WIDTH[mips] = "32"

	## mipsel-unknown-linux-{gnu, musl}
	DATA_LAYOUT[mipsel] = "e-m:m-p:32:32-i8:8:32-i16:16:32-i64:64-n32-S64"
	TARGET_ENDIAN[mipsel] = "little"
	TARGET_POINTER_WIDTH[mipsel] = "32"
	TARGET_C_INT_WIDTH[mipsel] = "32"
	MAX_ATOMIC_WIDTH[mipsel] = "32"

	## mips64-unknown-linux-{gnu, musl}
	DATA_LAYOUT[mips64] = "E-m:e-i8:8:32-i16:16:32-i64:64-n32:64-S128"
	TARGET_ENDIAN[mips64] = "big"
	TARGET_POINTER_WIDTH[mips64] = "64"
	TARGET_C_INT_WIDTH[mips64] = "64"
	MAX_ATOMIC_WIDTH[mips64] = "64"

	## mips64-n32-unknown-linux-{gnu, musl}
	DATA_LAYOUT[mips64-n32] = "E-m:e-p:32:32-i8:8:32-i16:16:32-i64:64-n32:64-S128"
	TARGET_ENDIAN[mips64-n32] = "big"
	TARGET_POINTER_WIDTH[mips64-n32] = "32"
	TARGET_C_INT_WIDTH[mips64-n32] = "32"
	MAX_ATOMIC_WIDTH[mips64-n32] = "64"

	## mips64el-unknown-linux-{gnu, musl}
	DATA_LAYOUT[mips64el] = "e-m:e-i8:8:32-i16:16:32-i64:64-n32:64-S128"
	TARGET_ENDIAN[mips64el] = "little"
	TARGET_POINTER_WIDTH[mips64el] = "64"
	TARGET_C_INT_WIDTH[mips64el] = "64"
	MAX_ATOMIC_WIDTH[mips64el] = "64"

	## powerpc-unknown-linux-{gnu, musl}
	DATA_LAYOUT[powerpc] = "E-m:e-p:32:32-i64:64-n32"
	TARGET_ENDIAN[powerpc] = "big"
	TARGET_POINTER_WIDTH[powerpc] = "32"
	TARGET_C_INT_WIDTH[powerpc] = "32"
	MAX_ATOMIC_WIDTH[powerpc] = "32"

	## powerpc64-unknown-linux-{gnu, musl}
	DATA_LAYOUT[powerpc64] = "E-m:e-i64:64-n32:64-S128-v256:256:256-v512:512:512"
	TARGET_ENDIAN[powerpc64] = "big"
	TARGET_POINTER_WIDTH[powerpc64] = "64"
	TARGET_C_INT_WIDTH[powerpc64] = "64"
	MAX_ATOMIC_WIDTH[powerpc64] = "64"

	## powerpc64le-unknown-linux-{gnu, musl}
	DATA_LAYOUT[powerpc64le] = "e-m:e-i64:64-n32:64-v256:256:256-v512:512:512"
	TARGET_ENDIAN[powerpc64le] = "little"
	TARGET_POINTER_WIDTH[powerpc64le] = "64"
	TARGET_C_INT_WIDTH[powerpc64le] = "64"
	MAX_ATOMIC_WIDTH[powerpc64le] = "64"

	## riscv32gc-unknown-linux-{gnu, musl}
	DATA_LAYOUT[riscv32gc] = "e-m:e-p:32:32-i64:64-n32-S128"
	TARGET_ENDIAN[riscv32gc] = "little"
	TARGET_POINTER_WIDTH[riscv32gc] = "32"
	TARGET_C_INT_WIDTH[riscv32gc] = "32"
	MAX_ATOMIC_WIDTH[riscv32gc] = "32"

	## riscv64gc-unknown-linux-{gnu, musl}
	DATA_LAYOUT[riscv64gc] = "e-m:e-p:64:64-i64:64-i128:128-n64-S128"
	TARGET_ENDIAN[riscv64gc] = "little"
	TARGET_POINTER_WIDTH[riscv64gc] = "64"
	TARGET_C_INT_WIDTH[riscv64gc] = "64"
	MAX_ATOMIC_WIDTH[riscv64gc] = "64"

	## loongarch64-unknown-linux-{gnu, musl}
	DATA_LAYOUT[loongarch64] = "e-m:e-i8:8:32-i16:16:32-i64:64-n32:64-S128"
	TARGET_ENDIAN[loongarch64] = "little"
	TARGET_POINTER_WIDTH[loongarch64] = "64"
	TARGET_C_INT_WIDTH[loongarch64] = "32"
	MAX_ATOMIC_WIDTH[loongarch64] = "64"
	FEATURES[loongarch64] = "+d"

	# Convert a normal arch (HOST_ARCH, TARGET_ARCH, BUILD_ARCH, etc) to something
	# rust's internals won't choke on.
	def arch_to_rust_target_arch(arch):
	if arch == "i586" or arch == "i686":
	return "x86"
	elif arch == "mipsel":
	return "mips"
	elif arch == "mip64sel":
	return "mips64"
	elif arch == "armv7":
	return "arm"
	elif arch == "powerpc64le":
	return "powerpc64"
	elif arch == "riscv32gc":
	return "riscv32"
	elif arch == "riscv64gc":
	return "riscv64"
	else:
	return arch

	# Convert a rust target string to a llvm-compatible triplet
	def rust_sys_to_llvm_target(sys):
	if sys.startswith('riscv32gc-'):
	return sys.replace('riscv32gc-', 'riscv32-', 1)
	if sys.startswith('riscv64gc-'):
	return sys.replace('riscv64gc-', 'riscv64-', 1)
	return sys

	# generates our target CPU value
	def llvm_cpu(d):
	cpu = d.getVar('PACKAGE_ARCH')
	target = d.getVar('TRANSLATED_TARGET_ARCH')

	trans = {}
	trans['corei7-64'] = "corei7"
	trans['core2-32'] = "core2"
	trans['x86-64'] = "x86-64"
	trans['i686'] = "i686"
	trans['i586'] = "i586"
	trans['mips64'] = "mips64"
	trans['mips64el'] = "mips64"
	trans['powerpc64le'] = "ppc64le"
	trans['powerpc64'] = "ppc64"
	trans['riscv64'] = "generic-rv64"
	trans['riscv32'] = "generic-rv32"
	trans['loongarch64'] = "la464"

	if target in ["mips", "mipsel", "powerpc"]:
	feat = frozenset(d.getVar('TUNE_FEATURES').split())
	if "mips32r2" in feat:
	trans['mipsel'] = "mips32r2"
	trans['mips'] = "mips32r2"
	elif "mips32" in feat:
	trans['mipsel'] = "mips32"
	trans['mips'] = "mips32"
	elif "ppc7400" in feat:
	trans['powerpc'] = "7400"

	try:
	return trans[cpu]
	except:
	return trans.get(target, "generic")

	llvm_cpu[vardepvalue] = "${@llvm_cpu(d)}"

	def rust_gen_target(d, thing, wd, arch):
	import json

	build_sys = d.getVar('BUILD_SYS')
	target_sys = d.getVar('TARGET_SYS')

	sys = d.getVar('{}_SYS'.format(thing))
	prefix = d.getVar('{}_PREFIX'.format(thing))
	rustsys = d.getVar('RUST_{}_SYS'.format(thing))

	abi = None
	cpu = "generic"
	features = ""

	# Need to apply the target tuning consitently, only if the triplet applies to the target
	# and not in the native case
	if sys == target_sys and sys != build_sys:
	abi = d.getVar('ABIEXTENSION')
	cpu = llvm_cpu(d)
	if bb.data.inherits_class('native', d):
	features = ','.join(llvm_features_from_cc_arch(d))
	else:
	features = llvm_features(d) or ""
	# arm and armv7 have different targets in llvm
	if arch == "arm" and target_is_armv7(d):
	arch = 'armv7'

	rust_arch = oe.rust.arch_to_rust_arch(arch)

	if abi:
	arch_abi = "{}-{}".format(rust_arch, abi)
	else:
	arch_abi = rust_arch

	features = features or d.getVarFlag('FEATURES', arch_abi) or ""
	features = features.strip()

	# build tspec
	tspec = {}
	tspec['llvm-target'] = rust_sys_to_llvm_target(rustsys)
	tspec['data-layout'] = d.getVarFlag('DATA_LAYOUT', arch_abi)
	if tspec['data-layout'] is None:
	bb.fatal("No rust target defined for %s" % arch_abi)
	tspec['max-atomic-width'] = int(d.getVarFlag('MAX_ATOMIC_WIDTH', arch_abi))
	tspec['target-pointer-width'] = d.getVarFlag('TARGET_POINTER_WIDTH', arch_abi)
	tspec['target-c-int-width'] = d.getVarFlag('TARGET_C_INT_WIDTH', arch_abi)
	tspec['target-endian'] = d.getVarFlag('TARGET_ENDIAN', arch_abi)
	tspec['arch'] = arch_to_rust_target_arch(rust_arch)
	if "baremetal" in d.getVar('TCLIBC'):
	tspec['os'] = "none"
	else:
	tspec['os'] = "linux"
	if "musl" in tspec['llvm-target']:
	tspec['env'] = "musl"
	else:
	tspec['env'] = "gnu"
	if "riscv64" in tspec['llvm-target']:
	tspec['llvm-abiname'] = "lp64d"
	if "riscv32" in tspec['llvm-target']:
	tspec['llvm-abiname'] = "ilp32d"
	if "loongarch64" in tspec['llvm-target']:
	tspec['llvm-abiname'] = "lp64d"
	tspec['vendor'] = "unknown"
	tspec['target-family'] = "unix"
	tspec['linker'] = "{}{}gcc".format(d.getVar('CCACHE'), prefix)
	tspec['cpu'] = cpu
	if features != "":
	tspec['features'] = features
	tspec['dynamic-linking'] = True
	tspec['executables'] = True
	tspec['linker-is-gnu'] = True
	tspec['linker-flavor'] = "gcc"
	tspec['has-rpath'] = True
	tspec['position-independent-executables'] = True
	tspec['panic-strategy'] = d.getVar("RUST_PANIC_STRATEGY")

	# write out the target spec json file
	with open(wd + rustsys + '.json', 'w') as f:
	json.dump(tspec, f, indent=4)

	# These are accounted for in tmpdir path names so don't need to be in the task sig
	rust_gen_target[vardepsexclude] += "ABIEXTENSION llvm_cpu"

	do_rust_gen_targets[vardeps] += "DATA_LAYOUT TARGET_ENDIAN TARGET_POINTER_WIDTH TARGET_C_INT_WIDTH MAX_ATOMIC_WIDTH FEATURES"

	RUST_TARGETS_DIR = "${WORKDIR}/rust-targets/"
	export RUST_TARGET_PATH = "${RUST_TARGETS_DIR}"

	python do_rust_gen_targets () {
	wd = d.getVar('RUST_TARGETS_DIR')
	# Order of BUILD, HOST, TARGET is important in case the files overwrite, most specific last
	rust_gen_target(d, 'BUILD', wd, d.getVar('BUILD_ARCH'))
	rust_gen_target(d, 'HOST', wd, d.getVar('HOST_ARCH'))
	rust_gen_target(d, 'TARGET', wd, d.getVar('TARGET_ARCH'))
	}

	addtask rust_gen_targets after do_patch before do_compile
	do_rust_gen_targets[dirs] += "${RUST_TARGETS_DIR}"

	# For building target C dependecies use only compiler parameters defined in OE
	# and ignore the CC crate defaults which conflicts with OE ones in some cases.
	# https://github.com/rust-lang/cc-rs#external-configuration-via-environment-variables
	# Some CC crate compiler flags are still required.
	# We apply them conditionally in rust wrappers.

	CRATE_CC_FLAGS:class-native = ""
	CRATE_CC_FLAGS:class-nativesdk = ""
	CRATE_CC_FLAGS:class-target = " -ffunction-sections -fdata-sections -fPIC"

	do_compile:prepend:class-target() {
	export CRATE_CC_NO_DEFAULTS=1
	}
	do_install:prepend:class-target() {
	export CRATE_CC_NO_DEFAULTS=1
	}