eclass: add rust-toolchain.eclass

Signed-off-by: Dirkjan Ochtman <djc@gentoo.org>

1 files changed, 120 insertions, 0 deletions

diff --git a/eclass/rust-toolchain.eclass b/eclass/rust-toolchain.eclass
new file mode 100644
index 000000000000..d09db264fc39
--- /dev/null
+++ b/eclass/rust-toolchain.eclass
@@ -0,0 +1,120 @@
+# Copyright 1999-2018 Gentoo Foundation
+# Distributed under the terms of the GNU General Public License v2
+
+# @ECLASS: rust-toolchain.eclass
+# @MAINTAINER:
+# Rust Project <rust@gentoo.org>
+# @SUPPORTED_EAPIS: 6
+# @BLURB: helps map gentoo arches to rust ABIs
+# @DESCRIPTION:
+# This eclass contains a src_unpack default phase function, and
+# helper functions, to aid in proper rust-ABI handling for various
+# gentoo arches.
+
+case ${EAPI} in
+	6) : ;;
+	7) : ;;
+	*) die "EAPI=${EAPI:-0} is not supported" ;;
+esac
+
+inherit multilib-build
+
+# @ECLASS-VARIABLE: RUST_TOOLCHAIN_BASEURL
+# @DESCRIPTION:
+# This variable specifies the base URL used by the
+# rust_arch_uri and rust_all_arch_uris functions when
+# generating the URI output list.
+: ${RUST_TOOLCHAIN_BASEURL:=https://static.rust-lang.org/dist/}
+
+# @FUNCTION: rust_abi
+# @USAGE: [CHOST-value]
+# @DESCRIPTION:
+# Outputs the Rust ABI name from a CHOST value, uses CHOST in the
+# environment if none is specified.
+
+rust_abi() {
+  local CTARGET=${1:-${CHOST}}
+  case ${CTARGET%%*-} in
+    aarch64*)     echo aarch64-unknown-linux-gnu;;
+    mips64*)      echo mips64-unknown-linux-gnuabi64;;
+    powerpc64le*) echo powerpc64le-unknown-linux-gnu;;
+    powerpc64*)   echo powerpc64-unknown-linux-gnu;;
+    x86_64*)      echo x86_64-unknown-linux-gnu;;
+    armv6j*s*)    echo arm-unknown-linux-gnueabi;;
+    armv6j*h*)    echo arm-unknown-linux-gnueabihf;;
+    armv7a*h*)    echo armv7-unknown-linux-gnueabihf;;
+    i?86*)        echo i686-unknown-linux-gnu;;
+    mipsel*)      echo mipsel-unknown-linux-gnu;;
+    mips*)        echo mips-unknown-linux-gnu;;
+    powerpc*)     echo powerpc-unknown-linux-gnu;;
+    s390x*)       echo s390x-unknown-linux-gnu;;
+    *)            echo ${CTARGET};;
+  esac
+}
+
+# @FUNCTION: rust_all_abis
+# @DESCRIPTION:
+# Outputs a list of all the enabled Rust ABIs
+rust_all_abis() {
+  if use multilib; then
+    local abi
+    local ALL_ABIS=()
+    for abi in $(multilib_get_enabled_abis); do
+      ALL_ABIS+=( $(rust_abi $(get_abi_CHOST ${abi})) )
+    done
+    local abi_list
+    IFS=, eval 'abi_list=${ALL_ABIS[*]}'
+    echo ${abi_list}
+  else
+    rust_abi
+  fi
+}
+
+# @FUNCTION: rust_arch_uri
+# @USAGE: <rust-ABI> <base-uri> [alt-distfile-basename]
+# @DESCRIPTION:
+# Output the URI for use in SRC_URI, combining $RUST_TOOLCHAIN_BASEURL
+# and the URI suffix provided in ARG2 with the rust ABI in ARG1, and
+# optionally renaming to the distfile basename specified in ARG3.
+#
+# @EXAMPLE:
+# SRC_URI="amd64? (
+#    $(rust_arch_uri x86_64-unknown-linux-gnu rustc-${STAGE0_VERSION})
+# )"
+#
+rust_arch_uri() {
+  if [ -n "$3" ]; then
+    echo "${RUST_TOOLCHAIN_BASEURL}${2}-${1}.tar.gz -> ${3}-${1}.tar.gz"
+  else
+    echo "${RUST_TOOLCHAIN_BASEURL}${2}-${1}.tar.gz"
+  fi
+}
+
+# @FUNCTION: rust_all_arch_uris
+# @USAGE <base-uri> [alt-distfile-basename]
+# @DESCRIPTION:
+# Outputs the URIs for SRC_URI to help fetch dependencies, using a base URI
+# provided as an argument.  Optionally allows for distfile renaming via a specified
+# basename.
+#
+# @EXAMPLE:
+# SRC_URI="$(rust_all_arch_uris rustc-${STAGE0_VERSION})"
+#
+rust_all_arch_uris()
+{
+  local uris=""
+  uris+="amd64? ( $(rust_arch_uri x86_64-unknown-linux-gnu       "$@") ) "
+  uris+="arm?   ( $(rust_arch_uri arm-unknown-linux-gnueabi      "$@")
+                  $(rust_arch_uri arm-unknown-linux-gnueabihf    "$@")
+                  $(rust_arch_uri armv7-unknown-linux-gnueabihf  "$@") ) "
+  uris+="arm64? ( $(rust_arch_uri aarch64-unknown-linux-gnu      "$@") ) "
+  uris+="mips?  ( $(rust_arch_uri mips-unknown-linux-gnu         "$@")
+                  $(rust_arch_uri mipsel-unknown-linux-gnu       "$@")
+                  $(rust_arch_uri mips64-unknown-linux-gnuabi64  "$@") ) "
+  uris+="ppc?   ( $(rust_arch_uri powerpc-unknown-linux-gnu      "$@") ) "
+  uris+="ppc64? ( $(rust_arch_uri powerpc64-unknown-linux-gnu    "$@")
+                  $(rust_arch_uri powerpc64le-unknown-linux-gnu  "$@") ) "
+  uris+="s390?  ( $(rust_arch_uri s390x-unknown-linux-gnu        "$@") ) "
+  uris+="x86?   ( $(rust_arch_uri i686-unknown-linux-gnu         "$@") ) "
+  echo "${uris}"
+}