sys-libs/gcompat: new package, add 1.1.0

Signed-off-by: Haelwenn (lanodan) Monnier <contact@hacktivis.me>

sys-libs/gcompat/Manifest

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+DIST gcompat-1.1.0.tar.xz 27456 BLAKE2B 60b008a08eb4841e24a5d810c7ed354e12b06d2e4046df6cf6e19ce01aca29dd5d18027c5c87b66c6821fd5f9677ce236ac6e1826339b294e936e5b90b5ad444 SHA512 fbaa5b5410bde295df11f72cf946aa81ab7d46a919a75e75f70e339d429e38f0fa9283400cbcd4bf8c646011300065f53788ffc584d6fbb093bf4dbd28e766ab

sys-libs/gcompat/gcompat-1.1.0.ebuild

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+# Copyright 2018-2020 Haelwenn (lanodan) Monnier <contact@hacktivis.me>
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=7
+
+inherit multilib-minimal flag-o-matic
+
+DESCRIPTION="The GNU C Library compatibility layer for musl"
+HOMEPAGE="https://git.adelielinux.org/adelie/gcompat"
+KEYWORDS="~amd64 ~x86"
+LICENSE="UoI-NCSA"
+IUSE="libucontext obstack"
+SRC_URI="https://distfiles.adelielinux.org/source/${PN}/${P}.tar.xz"
+SLOT="0"
+
+DEPEND="
+	libucontext? ( sys-libs/libucontext )
+	obstack? ( sys-libs/obstack-standalone )
+"
+RDEPEND="${DEPEND}"
+
+get_loader_name() {
+	# Loosely based on Adélie APKBUILD
+	# TODO: Check against glibc’s logic
+
+	case "$ABI" in
+		x86) echo "ld-linux.so.2" ;;
+		amd64) echo "ld-linux-x86-64.so.2" ;;
+		arm*) echo "ld-linux-armhf.so.3" ;;
+		arm64) echo "ld-linux-aarch64.so.1" ;;
+		mips | powerpc | s390) echo "ld.so.1" ;;
+	esac
+}
+
+get_linker_path() {
+	local arch=$(ldd 2>&1 | sed -n '1s/^musl libc (\(.*\))$/\1/p')
+	echo "/lib/ld-musl-${arch}.so.1"
+}
+
+src_compile() {
+	filter-flags "-Wl,--as-needed"
+
+	emake \
+		LINKER_PATH="$(get_linker_path)" \
+		LOADER_NAME="$(get_loader_name)" \
+		WITH_OBSTACK="$(usex obstack 'obstack-standalone' 'no')" \
+		$(usex libucontext WITH_LIBUCONTEXT=yes '')
+}
+
+src_install() {
+	emake \
+		LINKER_PATH="$(get_linker_path)" \
+		LOADER_NAME="$(get_loader_name)" \
+		WITH_OBSTACK="$(usex obstack 'obstack-standalone' 'no')" \
+		$(usex libucontext WITH_LIBUCONTEXT=yes '') \
+		DESTDIR="${D}" \
+		install
+}

sys-libs/gcompat/metadata.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
+<pkgmetadata>
+	<maintainer type="person">
+		<email>contact@hacktivis.me</email>
+		<name>Haelwenn (lanodan) Monnier</name>
+	</maintainer>
+	<use>
+		<flag name="obstack">Use <pkg>sys-libs/obstack-standalone</pkg> for greater compatibility</flag>
+	</use>
+</pkgmetadata>