dev-lang/go: 1.12.1 bump and cross compile fix

dev-lang/go, before this commit, failed to build in an environment
generated by sys-devel/crossdev for two reasons:

1. The bootstrap download package matched the target rather than host arch.

We can't determine the host arch based on use flags, so we need to
download all bootstrap packages.

2.  The GOROOT_BOOTSTRAP environment variable matched the host rather than
target arch.

To fix this, we need to pass CBUILD to the calls to go_os and go_arch.

This fixes both issues for a successful cross-compile.

Closes: https://bugs.gentoo.org/671394
Package-Manager: Portage-2.3.62, Repoman-2.3.12
Signed-off-by: William Hubbs <williamh@gentoo.org>

2 files changed, 232 insertions, 0 deletions

diff --git a/dev-lang/go/Manifest b/dev-lang/go/Manifest
index ec2ccea2df7d..0a6b6765bf9b 100644
--- a/dev-lang/go/Manifest
+++ b/dev-lang/go/Manifest
@@ -10,4 +10,5 @@ DIST go-linux-ppc64le-bootstrap-1.8.tbz 52211575 BLAKE2B 7a28ec5a381369c4e9415c8
 DIST go-linux-s390x-bootstrap-1.8.tbz 57124869 BLAKE2B 920a176b8f4fc3a816e724324bbb30a383d599e31a0d2093d24797dbcd0e799a662a3589dbb87d2f5dd16df07c4cf8f1e444e87b540ec732746bb025dc9271f8 SHA512 d429cae870d66217ab2e07c74209d3031d97baa4f899b4d70ae6283a1a5b1434b037904c4cfca0b2bc798d5ba0b358c3739e000eccbc74809baf564c5686df5a
 DIST go-solaris-amd64-bootstrap-1.8.tbz 54926326 BLAKE2B 0a45312f090d81ebf46fe5950cb65c059e2801394231e715e94145d1f918eb59b10472b2385e57ebd5cfb9eca0ad7290fb118436486b665520bb540970f971ab SHA512 52b849e5b9a940e10de7ba3df0ebdf6e1c5d631de9581d936c9edf8f38e6bb3314acbc2b2d5202b0528fde2a359d52bc0c6f39acf9b1b614725e4b4a947ed10d
 DIST go1.11.5.src.tar.gz 21108339 BLAKE2B 3a33a89e267e57fee688e4d67257810ca1f37cfb904b6806c3a566b021aa80153f59f64d3a61ed68f526f093e0d5b6b3c95565cd06622cf9a65eef81bc7e9733 SHA512 63500238e8d73e4b29279ee3eb9242960de93ccd3b52bacc4009f45cf123cb8edfe5f519d38c5b07bdf2a810925758511ff3255310a056113d0169f78be1d2f6
+DIST go1.12.1.src.tar.gz 21963082 BLAKE2B fd9c0ca19e6bd285c52034a88df1a58f96b957483362fac2e0c0f2a9dddde0543e7569d76fb93eff473774d152db361bfe9bdd354d80412c71ee5c4162010346 SHA512 b3fdfb874e6e0e0b50458085724fbd8e8b9be212df3f777b97db340aa3b80f32ee08d646a57a8a7d52ff6f19657d884dd25018c866c6173473aafa20a58f1975
 DIST go1.12.src.tar.gz 21962486 BLAKE2B 3581fa9eb2582cec8ece233930322d964dd03e82f2e44ac0cbe75869d4c184003db2b21dcf871fafe5a81380ba7da7675b2fe3549348dfa60bf27fa9af2bb824 SHA512 6a4b8e75b3f6455885e93961c502ab40822e6353d1108ce25ca857afbdca08a64b1408dbeba2d37db581d6c85b9a919de95fb7c0d487a327e555a30b51cd8410
diff --git a/dev-lang/go/go-1.12.1.ebuild b/dev-lang/go/go-1.12.1.ebuild
new file mode 100644
index 000000000000..5945c3e7440b
--- /dev/null
+++ b/dev-lang/go/go-1.12.1.ebuild
@@ -0,0 +1,231 @@
+# Copyright 1999-2019 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=7
+
+export CBUILD=${CBUILD:-${CHOST}}
+export CTARGET=${CTARGET:-${CHOST}}
+
+MY_PV=${PV/_/}
+
+inherit toolchain-funcs
+
+BOOTSTRAP_DIST="https://dev.gentoo.org/~williamh/dist"
+BOOTSTRAP_VERSION="bootstrap-1.8"
+BOOTSTRAP_URI="
+	${BOOTSTRAP_DIST}/go-linux-amd64-${BOOTSTRAP_VERSION}.tbz
+	${BOOTSTRAP_DIST}/go-linux-arm-${BOOTSTRAP_VERSION}.tbz
+	${BOOTSTRAP_DIST}/go-linux-arm64-${BOOTSTRAP_VERSION}.tbz
+	${BOOTSTRAP_DIST}/go-linux-ppc64-${BOOTSTRAP_VERSION}.tbz
+	${BOOTSTRAP_DIST}/go-linux-ppc64le-${BOOTSTRAP_VERSION}.tbz
+	${BOOTSTRAP_DIST}/go-linux-s390x-${BOOTSTRAP_VERSION}.tbz
+	${BOOTSTRAP_DIST}/go-linux-386-${BOOTSTRAP_VERSION}.tbz
+	${BOOTSTRAP_DIST}/go-freebsd-amd64-${BOOTSTRAP_VERSION}.tbz
+	${BOOTSTRAP_DIST}/go-freebsd-386-${BOOTSTRAP_VERSION}.tbz
+	${BOOTSTRAP_DIST}/go-darwin-amd64-${BOOTSTRAP_VERSION}.tbz
+	${BOOTSTRAP_DIST}/go-solaris-amd64-${BOOTSTRAP_VERSION}.tbz
+"
+
+case ${PV}  in
+*9999*)
+	EGIT_REPO_URI="https://github.com/golang/go.git"
+	inherit git-r3
+	;;
+*)
+	SRC_URI="https://storage.googleapis.com/golang/go${MY_PV}.src.tar.gz "
+	S="${WORKDIR}"/go
+	case ${PV} in
+	*_beta*|*_rc*) ;;
+	*)
+		KEYWORDS="-* ~amd64 ~arm ~arm64 ~ppc64 ~s390 ~x86 ~amd64-fbsd ~x86-fbsd ~amd64-linux ~x64-macos ~x64-solaris"
+		# The upstream tests fail under portage but pass if the build is
+		# run according to their documentation [1].
+		# I am restricting the tests on released versions until this is
+		# solved.
+		# [1] https://golang.org/issues/18442
+		RESTRICT="test"
+		;;
+	esac
+esac
+SRC_URI+="!gccgo? ( ${BOOTSTRAP_URI} )"
+
+DESCRIPTION="A concurrent garbage collected and typesafe programming language"
+HOMEPAGE="https://golang.org"
+
+LICENSE="BSD"
+SLOT="0/${PV}"
+IUSE="gccgo"
+
+BDEPEND="gccgo? ( >=sys-devel/gcc-5[go] )"
+RDEPEND="!<dev-go/go-tools-0_pre20150902"
+
+# These test data objects have writable/executable stacks.
+QA_EXECSTACK="
+	usr/lib/go/src/debug/elf/testdata/*.obj
+	usr/lib/go/src/*.gox
+	"
+
+# Do not complain about CFLAGS, etc, since Go doesn't use them.
+QA_FLAGS_IGNORED='.*'
+
+REQUIRES_EXCLUDE="/usr/lib/go/src/debug/elf/testdata/*"
+
+# The tools in /usr/lib/go should not cause the multilib-strict check to fail.
+QA_MULTILIB_PATHS="usr/lib/go/pkg/tool/.*/.*"
+
+# Do not strip this package. Stripping is unsupported upstream and may
+# fail.
+RESTRICT+=" strip"
+
+DOCS=(
+AUTHORS
+CONTRIBUTING.md
+CONTRIBUTORS
+PATENTS
+README.md
+)
+
+go_arch()
+{
+	# By chance most portage arch names match Go
+	local portage_arch=$(tc-arch $@)
+	case "${portage_arch}" in
+		x86)	echo 386;;
+		x64-*)	echo amd64;;
+		ppc64) [[ $(tc-endian $@) = big ]] && echo ppc64 || echo ppc64le ;;
+		s390) echo s390x ;;
+		*)		echo "${portage_arch}";;
+	esac
+}
+
+go_arm()
+{
+	case "${1:-${CHOST}}" in
+		armv5*)	echo 5;;
+		armv6*)	echo 6;;
+		armv7*)	echo 7;;
+		*)
+			die "unknown GOARM for ${1:-${CHOST}}"
+			;;
+	esac
+}
+
+go_os()
+{
+	case "${1:-${CHOST}}" in
+		*-linux*)	echo linux;;
+		*-darwin*)	echo darwin;;
+		*-freebsd*)	echo freebsd;;
+		*-netbsd*)	echo netbsd;;
+		*-openbsd*)	echo openbsd;;
+		*-solaris*)	echo solaris;;
+		*-cygwin*|*-interix*|*-winnt*)
+			echo windows
+			;;
+		*)
+			die "unknown GOOS for ${1:-${CHOST}}"
+			;;
+	esac
+}
+
+go_tuple()
+{
+	echo "$(go_os $@)_$(go_arch $@)"
+}
+
+go_cross_compile()
+{
+	[[ $(go_tuple ${CBUILD}) != $(go_tuple) ]]
+}
+
+pkg_pretend()
+{
+	# make.bash does not understand cross-compiling a cross-compiler
+	if [[ $(go_tuple) != $(go_tuple ${CTARGET}) ]]; then
+		die "CHOST CTARGET pair unsupported: CHOST=${CHOST} CTARGET=${CTARGET}"
+	fi
+}
+
+src_unpack()
+{
+	if [[ ${PV} = 9999 ]]; then
+		git-r3_src_unpack
+	fi
+	default
+}
+
+src_compile()
+{
+	export GOROOT_BOOTSTRAP="${WORKDIR}"/go-$(go_os ${CBUILD})-$(go_arch ${CBUILD})-bootstrap
+	if use gccgo; then
+		mkdir -p "${GOROOT_BOOTSTRAP}/bin" || die
+		local go_binary=$(gcc-config --get-bin-path)/go-$(gcc-major-version)
+		[[ -x ${go_binary} ]] || go_binary=$(
+			find "${EPREFIX}"/usr/${CHOST}/gcc-bin/*/go-$(gcc-major-version) |
+				sort -V | tail -n1)
+		[[ -x ${go_binary} ]] ||
+			die "go-$(gcc-major-version): command not found"
+		ln -s "${go_binary}" "${GOROOT_BOOTSTRAP}/bin/go" || die
+	fi
+	export GOROOT_FINAL="${EPREFIX}"/usr/lib/go
+	export GOROOT="$(pwd)"
+	export GOBIN="${GOROOT}/bin"
+
+	# Go's build script does not use BUILD/HOST/TARGET consistently. :(
+	export GOHOSTARCH=$(go_arch ${CBUILD})
+	export GOHOSTOS=$(go_os ${CBUILD})
+	export CC=$(tc-getBUILD_CC)
+
+	export GOARCH=$(go_arch)
+	export GOOS=$(go_os)
+	export CC_FOR_TARGET=$(tc-getCC)
+	export CXX_FOR_TARGET=$(tc-getCXX)
+	if [[ ${ARCH} == arm ]]; then
+		export GOARM=$(go_arm)
+	fi
+
+	cd src
+	./make.bash || die "build failed"
+}
+
+src_test()
+{
+	go_cross_compile && return 0
+
+	cd src
+	PATH="${GOBIN}:${PATH}" \
+	./run.bash -no-rebuild || die "tests failed"
+}
+
+src_install()
+{
+	local bin_path f x
+
+	dodir /usr/lib/go
+
+	# There is a known issue which requires the source tree to be installed [1].
+	# Once this is fixed, we can consider using the doc use flag to control
+	# installing the doc and src directories.
+	# [1] https://golang.org/issue/2775
+	#
+	# deliberately use cp to retain permissions
+	cp -R api bin doc lib pkg misc src test "${ED}"/usr/lib/go
+	if go_cross_compile; then
+		bin_path="bin/$(go_tuple)"
+	else
+		bin_path=bin
+	fi
+	for x in ${bin_path}/*; do
+		f=${x##*/}
+		dosym ../lib/go/${bin_path}/${f} /usr/bin/${f}
+	done
+	einstalldocs
+
+	if [[ ${CHOST} == *-darwin* ]] ; then
+		# fix install_name for test object (binutils_test) on Darwin, it
+		# is never used in real circumstances
+		local libmac64="${EPREFIX}"/usr/lib/go/src/cmd/vendor/github.com/
+		      libmac64+=google/pprof/internal/binutils/testdata/lib_mac_64
+		install_name_tool -id "${libmac64}" "${D}${libmac64}"
+	fi
+}