several backports from deps

dev-python/coverage/Manifest

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+DIST coverage-4.5.1.tar.gz 379675 BLAKE2B a3dd18b6c6512a2880f48e685c15eed33589d7d46ffaddedd69dad88b8baa383e1661e1cd232e44f466512e292f82638ee2fd198de01dbd1324cb01857b986cf SHA512 82742a572549400778cad99057b1ced4c36b61e917983148eccc86bfa6340de8cfefc4f743e79ff876b641e0b9d21307dd6bde78638a6b20dd8ad215068dda25
+EBUILD coverage-4.5.1.ebuild 1245 BLAKE2B 7261754c2561133e867b651e780ad794543e52c8c9c3a7e68924877ef293ca13a5cc48ae4fbd57ba9542161d7bc3a5438769710287eead2950cc2f4e362e2316 SHA512 e683690a3ad77aff3b4ca2d92aeea4c0b531f995f41958fe4c21eb83a8515552701193d222f0c02a4d07feee0c7524a061c72ee69dd032ca121552f2b95a88c4

dev-python/coverage/coverage-4.5.1.ebuild

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+# Copyright 1999-2018 Gentoo Foundation
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=5
+
+PYTHON_COMPAT=( python2_7 python3_{4,5,6,7} pypy pypy3 )
+PYTHON_REQ_USE="threads(+)"
+
+inherit distutils-r1
+
+DESCRIPTION="Code coverage measurement for Python"
+HOMEPAGE="https://coverage.readthedocs.io/en/latest/ https://pypi.org/project/coverage/"
+SRC_URI="mirror://pypi/${PN:0:1}/${PN}/${P}.tar.gz"
+
+LICENSE="BSD"
+SLOT="0"
+KEYWORDS="alpha amd64 arm arm64 hppa ia64 m68k ~mips ppc ppc64 s390 sh sparc x86 ~amd64-fbsd ~x86-fbsd ~amd64-linux ~x86-linux ~ppc-macos ~x64-macos ~x86-macos ~sparc-solaris ~sparc64-solaris ~x64-solaris ~x86-solaris"
+IUSE="test"
+
+RDEPEND=""
+DEPEND="
+	>=dev-python/setuptools-18.4[${PYTHON_USEDEP}]
+	test? (
+		dev-python/PyContracts[${PYTHON_USEDEP}]
+		dev-python/mock[${PYTHON_USEDEP}]
+		dev-python/nose[${PYTHON_USEDEP}]
+	)
+"
+
+python_compile() {
+	if [[ ${EPYTHON} == python2.7 ]]; then
+		local CFLAGS="${CFLAGS} -fno-strict-aliasing"
+		export CFLAGS
+	fi
+
+	distutils-r1_python_compile
+}
+
+python_test() {
+	cd "${BUILD_DIR}"/lib || die
+	[[ "${PYTHON}" =~ pypy ]] && export COVERAGE_NO_EXTENSION=no
+	${PYTHON} "${S}"/igor.py test_with_tracer py || die
+	${PYTHON} "${S}"/igor.py test_with_tracer c || die
+}