1 files changed, 75 insertions, 0 deletions
diff --git a/sys-libs/zlib-ng/zlib-ng-2.0.5.ebuild b/sys-libs/zlib-ng/zlib-ng-2.0.5.ebuild
new file mode 100644
index 000000000000..35316b265096
--- /dev/null
+++ b/sys-libs/zlib-ng/zlib-ng-2.0.5.ebuild
@@ -0,0 +1,75 @@
+# Copyright 1999-2021 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=7
+
+inherit cmake
+
+DESCRIPTION="Fork of the zlib data compression library"
+HOMEPAGE="https://github.com/zlib-ng/zlib-ng"
+SRC_URI="https://github.com/${PN}/${PN}/archive/${PV}.tar.gz -> ${P}.tar.gz"
+
+LICENSE="ZLIB"
+SLOT="0"
+#KEYWORDS="~amd64 ~x86"
+
+CPU_USE=( cpu_flags_{x86_{avx2,sse2,ssse3,sse4a,pclmul},arm_{crc32,neon},ppc_vsx2} )
+IUSE="compat ${CPU_USE[@]} test"
+
+RESTRICT="!test? ( test )"
+
+RDEPEND="compat? ( !sys-libs/zlib )"
+
+src_configure() {
+	local mycmakeargs=(
+		-DZLIB_COMPAT="$(usex compat)"
+		-DZLIB_ENABLE_TESTS="$(usex test)"
+		# Unaligned access is controversial and undefined behaviour
+		# Let's keep it off for now
+		# https://github.com/gentoo/gentoo/pull/17167
+		-DWITH_UNALIGNED="OFF"
+	)
+
+	# The intrinsics options are all defined conditionally, so we need
+	# to enable them on/off per-arch here for now.
+	if use amd64 || use x86 ; then
+		mycmakeargs+=(
+			-DWITH_AVX2=$(usex cpu_flags_x86_avx2)
+			-DWITH_SSE2=$(usex cpu_flags_x86_sse2)
+			-DWITH_SSSE3=$(usex cpu_flags_x86_ssse3)
+			-DWITH_SSE4=$(usex cpu_flags_x86_sse4a)
+			-DWITH_PCLMULQDQ=$(usex cpu_flags_x86_pclmul)
+		)
+	fi
+
+	if use arm || use arm64 ; then
+		mycmakeargs+=(
+			-DWITH_ACLE=$(usex cpu_flags_arm_crc32)
+			-DWITH_NEON=$(usex cpu_flags_arm_neon)
+		)
+	fi
+
+	if use ppc || use ppc64 ; then
+		# The POWER8 support is VSX which was introduced
+		# VSX2 was introduced with POWER8, so use that as a proxy for it
+		mycmakeargs+=(
+			-DWITH_POWER8=$(usex cpu_flags_ppc_vsx2)
+		)
+	fi
+
+	# TODO: There's no s390x USE_EXPAND yet
+
+	cmake_src_configure
+}
+
+src_install() {
+	cmake_src_install
+
+	if use compat ; then
+		ewarn "zlib-ng is experimental and replacing the system zlib is dangerous"
+		ewarn "Please be careful!"
+		ewarn
+		ewarn "The following link explains the guarantees (and what is NOT guaranteed):"
+		ewarn "https://github.com/zlib-ng/zlib-ng/blob/2.0.x/PORTING.md"
+	fi
+}