classes: Update classes to match new bitbake class scope functionality

Move classes to classes-global or classes-recipe as appropriate to take
advantage of new bitbake functionality to check class scope/usage.

(From OE-Core rev: f5c128008365e141082c129417eb72d2751e8045)

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

1 files changed, 177 insertions, 0 deletions

diff --git a/meta/classes-recipe/rust-common.bbclass b/meta/classes-recipe/rust-common.bbclass
new file mode 100644
index 0000000000..93bf6c8be6
--- /dev/null
+++ b/meta/classes-recipe/rust-common.bbclass
@@ -0,0 +1,177 @@
+#
+# Copyright OpenEmbedded Contributors
+#
+# SPDX-License-Identifier: MIT
+#
+
+inherit python3native
+inherit rust-target-config
+
+# Common variables used by all Rust builds
+export rustlibdir = "${libdir}/rustlib/${RUST_HOST_SYS}/lib"
+FILES:${PN} += "${rustlibdir}/*.so"
+FILES:${PN}-dev += "${rustlibdir}/*.rlib ${rustlibdir}/*.rmeta"
+FILES:${PN}-dbg += "${rustlibdir}/.debug"
+
+RUSTLIB = "-L ${STAGING_DIR_HOST}${rustlibdir}"
+RUST_DEBUG_REMAP = "--remap-path-prefix=${WORKDIR}=/usr/src/debug/${PN}/${EXTENDPE}${PV}-${PR}"
+RUSTFLAGS += "${RUSTLIB} ${RUST_DEBUG_REMAP}"
+RUSTLIB_DEP ?= "libstd-rs"
+RUST_PANIC_STRATEGY ?= "unwind"
+
+def target_is_armv7(d):
+    '''Determine if target is armv7'''
+    # TUNE_FEATURES may include arm* even if the target is not arm
+    # in the case of *-native packages
+    if d.getVar('TARGET_ARCH') != 'arm':
+        return False
+
+    feat = d.getVar('TUNE_FEATURES')
+    feat = frozenset(feat.split())
+    mach_overrides = d.getVar('MACHINEOVERRIDES')
+    mach_overrides = frozenset(mach_overrides.split(':'))
+
+    v7=frozenset(['armv7a', 'armv7r', 'armv7m', 'armv7ve'])
+    if mach_overrides.isdisjoint(v7) and feat.isdisjoint(v7):
+        return False
+    else:
+        return True
+target_is_armv7[vardepvalue] = "${@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 d.getVar('{}_ARCH'.format(thing)) == d.getVar('TARGET_ARCH') and target_is_armv7(d):
+        arch = "armv7"
+    else:
+        arch = oe.rust.arch_to_rust_arch(d.getVar('{}_ARCH'.format(thing)))
+
+    # When bootstrapping rust-native, BUILD must be the same as upstream snapshot tarballs
+    bpn = d.getVar('BPN')
+    if thing == "BUILD" and bpn in ["rust"]:
+        return arch + "-unknown-linux-gnu"
+
+    vendor = d.getVar('{}_VENDOR'.format(thing))
+
+    # Default to glibc
+    libc = "-gnu"
+    os = d.getVar('{}_OS'.format(thing))
+    # 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)
+    elif "musl" in os:
+        libc = "-musl"
+        os = "linux"
+
+    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_BUILD_SYS[vardepvalue] = "${RUST_BUILD_SYS}"
+RUST_HOST_SYS = "${@rust_base_triple(d, 'HOST')}"
+RUST_HOST_SYS[vardepvalue] = "${RUST_HOST_SYS}"
+RUST_TARGET_SYS = "${@rust_base_triple(d, 'TARGET')}"
+RUST_TARGET_SYS[vardepvalue] = "${RUST_TARGET_SYS}"
+
+# wrappers to get around the fact that Rust needs a single
+# binary but Yocto's compiler and linker commands have
+# arguments. Technically the archiver is always one command but
+# this is necessary for builds that determine the prefix and then
+# use those commands based on the prefix.
+WRAPPER_DIR = "${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_rust () {
+        file="$1"
+        shift
+        extras="$1"
+        shift
+
+        cat <<- EOF > "${file}"
+        #!/usr/bin/env python3
+        import os, sys
+        orig_binary = "$@"
+        extras = "${extras}"
+        binary = orig_binary.split()[0]
+        args = orig_binary.split() + sys.argv[1:]
+        if extras:
+            args.append(extras)
+        os.execvp(binary, args)
+        EOF
+        chmod +x "${file}"
+}
+
+WRAPPER_TARGET_CC = "${CC}"
+WRAPPER_TARGET_CXX = "${CXX}"
+WRAPPER_TARGET_CCLD = "${CCLD}"
+WRAPPER_TARGET_LDFLAGS = "${LDFLAGS}"
+WRAPPER_TARGET_EXTRALD = ""
+WRAPPER_TARGET_AR = "${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 "${WRAPPER_DIR}"
+
+        # Yocto Build / Rust Host C compiler
+        create_wrapper_rust "${RUST_BUILD_CC}" "" "${BUILD_CC}"
+        # Yocto Build / Rust Host C++ compiler
+        create_wrapper_rust "${RUST_BUILD_CXX}" "" "${BUILD_CXX}"
+        # Yocto Build / Rust Host linker
+        create_wrapper_rust "${RUST_BUILD_CCLD}" "" "${BUILD_CCLD}" "${BUILD_LDFLAGS}"
+        # Yocto Build / Rust Host archiver
+        create_wrapper_rust "${RUST_BUILD_AR}" "" "${BUILD_AR}"
+
+        # Yocto Target / Rust Target C compiler
+        create_wrapper_rust "${RUST_TARGET_CC}" "${WRAPPER_TARGET_EXTRALD}" "${WRAPPER_TARGET_CC}" "${WRAPPER_TARGET_LDFLAGS}"
+        # Yocto Target / Rust Target C++ compiler
+        create_wrapper_rust "${RUST_TARGET_CXX}" "${WRAPPER_TARGET_EXTRALD}" "${WRAPPER_TARGET_CXX}" "${CXXFLAGS}"
+        # Yocto Target / Rust Target linker
+        create_wrapper_rust "${RUST_TARGET_CCLD}" "${WRAPPER_TARGET_EXTRALD}" "${WRAPPER_TARGET_CCLD}" "${WRAPPER_TARGET_LDFLAGS}"
+        # Yocto Target / Rust Target archiver
+        create_wrapper_rust "${RUST_TARGET_AR}" "" "${WRAPPER_TARGET_AR}"
+
+}
+
+addtask rust_create_wrappers before do_configure after do_patch do_prepare_recipe_sysroot
+do_rust_create_wrappers[dirs] += "${WRAPPER_DIR}"