rust-target-config: Create new class to contain target json config generation

Currently most of the rust recipes use this code but it is all piecemeal.
Turn the code into a class where things can start to be rationalised. Ultimately
some of the data and python code should be moved to a python library but one step
at a time.

No functionality changes.

(From OE-Core rev: 3795285cbf362e13b8151bfdbe1bce999ac28641)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

3 files changed, 2 insertions, 371 deletions

diff --git a/meta/recipes-devtools/cargo/cargo-cross-canadian.inc b/meta/recipes-devtools/cargo/cargo-cross-canadian.inc
index d12267db3d..e83b6a67b3 100644
--- a/meta/recipes-devtools/cargo/cargo-cross-canadian.inc
+++ b/meta/recipes-devtools/cargo/cargo-cross-canadian.inc
@@ -5,7 +5,7 @@ RUST_ALTERNATE_EXE_PATH = "${STAGING_LIBDIR_NATIVE}/llvm-rust/bin/llvm-config"
 HOST_SYS = "${HOST_ARCH}-unknown-linux-gnu"
 CARGO_RUST_TARGET_CCLD = "${RUST_BUILD_CCLD}"
 
-require recipes-devtools/rust/rust-common.inc
+inherit rust-target-config
 require cargo.inc
 
 CARGO = "${WORKDIR}/${CARGO_SNAPSHOT}/bin/cargo"
diff --git a/meta/recipes-devtools/rust/rust-common.inc b/meta/recipes-devtools/rust/rust-common.inc
deleted file mode 100644
index 2edc71e0d3..0000000000
--- a/meta/recipes-devtools/rust/rust-common.inc
+++ /dev/null
@@ -1,369 +0,0 @@
-
-# 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")
-    if 'vfpv3' in feat:
-        f.append("+vfp3")
-    if 'vfpv3d16' in feat:
-        f.append("+d16")
-
-    if 'vfpv2' in feat or 'vfp' in feat:
-        f.append("+vfp2")
-
-    if 'neon' in feat:
-        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] = "${@llvm_features_from_tune(d)}"
-
-# TARGET_CC_ARCH changes from build/cross/target so it'll do the right thing
-# this should go away when https://github.com/rust-lang/rust/pull/31709 is
-# stable (1.9.0?)
-def llvm_features_from_cc_arch(d):
-    f = []
-    feat = d.getVar('TARGET_CC_ARCH')
-    if not feat:
-        return []
-    feat = frozenset(feat.split())
-
-    if '-mmmx' in feat:
-        f.append("+mmx")
-    if '-msse' in feat:
-        f.append("+sse")
-    if '-msse2' in feat:
-        f.append("+sse2")
-    if '-msse3' in feat:
-        f.append("+sse3")
-    if '-mssse3' in feat:
-        f.append("+ssse3")
-    if '-msse4.1' in feat:
-        f.append("+sse4.1")
-    if '-msse4.2' in feat:
-        f.append("+sse4.2")
-    if '-msse4a' in feat:
-        f.append("+sse4a")
-    if '-mavx' in feat:
-        f.append("+avx")
-    if '-mavx2' in feat:
-        f.append("+avx2")
-
-    return f
-
-def llvm_features_from_target_fpu(d):
-    # TARGET_FPU can be hard or soft. +soft-float tell llvm to use soft float
-    # ABI. There is no option for hard.
-
-    fpu = d.getVar('TARGET_FPU', True)
-    return ["+soft-float"] if fpu == "soft" else []
-
-def llvm_features(d):
-    return ','.join(llvm_features_from_tune(d) +
-                    llvm_features_from_cc_arch(d) +
-                    llvm_features_from_target_fpu(d))
-
-llvm_features[vardepvalue] = "${@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"
-
-## 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"
-
-## riscv32-unknown-linux-{gnu, musl}
-DATA_LAYOUT[riscv32] = "e-m:e-p:32:32-i64:64-n32-S128"
-TARGET_ENDIAN[riscv32] = "little"
-TARGET_POINTER_WIDTH[riscv32] = "32"
-TARGET_C_INT_WIDTH[riscv32] = "32"
-MAX_ATOMIC_WIDTH[riscv32] = "32"
-
-## riscv64-unknown-linux-{gnu, musl}
-DATA_LAYOUT[riscv64] = "e-m:e-p:64:64-i64:64-i128:128-n64-S128"
-TARGET_ENDIAN[riscv64] = "little"
-TARGET_POINTER_WIDTH[riscv64] = "64"
-TARGET_C_INT_WIDTH[riscv64] = "64"
-MAX_ATOMIC_WIDTH[riscv64] = "64"
-
-# 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"
-    else:
-        return arch
-
-# 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['powerpc'] = "powerpc"
-    trans['mips64'] = "mips64"
-    trans['mips64el'] = "mips64"
-    trans['riscv64'] = "generic-rv64"
-    trans['riscv32'] = "generic-rv32"
-
-    if target in ["mips", "mipsel"]:
-        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"
-
-    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
-    sys = d.getVar('{}_SYS'.format(thing))
-    prefix = d.getVar('{}_PREFIX'.format(thing))
-
-    abi = None
-    cpu = "generic"
-    features = ""
-
-    if thing == "TARGET":
-        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()
-
-    llvm_target = d.getVar('RUST_TARGET_SYS')
-    if thing == "BUILD":
-        llvm_target = d.getVar('RUST_HOST_SYS')
-
-    # build tspec
-    tspec = {}
-    tspec['llvm-target'] = llvm_target
-    tspec['data-layout'] = d.getVarFlag('DATA_LAYOUT', 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)
-    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"
-    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['has-elf-tls'] = True
-    tspec['position-independent-executables'] = True
-    tspec['panic-strategy'] = d.getVar("RUST_PANIC_STRATEGY")
-
-    # write out the target spec json file
-    with open(wd + sys + '.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] += "RUST_HOST_SYS RUST_TARGET_SYS ABIEXTENSION llvm_cpu"
-
-do_rust_gen_targets[vardeps] += "DATA_LAYOUT TARGET_ENDIAN TARGET_POINTER_WIDTH TARGET_C_INT_WIDTH MAX_ATOMIC_WIDTH FEATURES"
-
-python do_rust_gen_targets () {
-    wd = d.getVar('WORKDIR') + '/targets/'
-    build_arch = d.getVar('BUILD_ARCH')
-    rust_gen_target(d, 'BUILD', wd, build_arch)
-}
-
-addtask rust_gen_targets after do_patch before do_compile
-do_rust_gen_targets[dirs] += "${WORKDIR}/targets"
-
diff --git a/meta/recipes-devtools/rust/rust.inc b/meta/recipes-devtools/rust/rust.inc
index ea716d31f2..ecb057ad3b 100644
--- a/meta/recipes-devtools/rust/rust.inc
+++ b/meta/recipes-devtools/rust/rust.inc
@@ -39,7 +39,7 @@ setup_cargo_environment () {
     printf "linker = '%s'\n" "${RUST_BUILD_CCLD}" >> ${CARGO_HOME}/config
 }
 
-include rust-common.inc
+inherit rust-target-config
 
 do_rust_setup_snapshot () {
     for installer in "${WORKDIR}/rust-snapshot-components/"*"/install.sh"; do