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diff --git a/dev-util/ccache/ccache-4.0.ebuild b/dev-util/ccache/ccache-4.0.ebuild
new file mode 100644
index 000000000000..da46cf9b15a3
--- /dev/null
+++ b/dev-util/ccache/ccache-4.0.ebuild
@@ -0,0 +1,104 @@
+# Copyright 1999-2020 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=7
+
+inherit cmake toolchain-funcs
+
+DESCRIPTION="fast compiler cache"
+HOMEPAGE="https://ccache.dev/"
+SRC_URI="https://github.com/ccache/ccache/releases/download/v${PV}/ccache-${PV}.tar.xz"
+
+LICENSE="GPL-3 LGPL-3"
+SLOT="0"
+KEYWORDS="~alpha ~amd64 ~arm ~arm64 ~hppa ~ia64 ~m68k ~mips ~ppc ~ppc64 ~riscv ~s390 ~sparc ~x86"
+IUSE="test"
+
+DEPEND=""
+RDEPEND="${DEPEND}
+	dev-util/shadowman
+	sys-apps/gentoo-functions"
+# clang-specific tests use dev-libs/elfutils to compare objects for equality.
+# Let's pull in the dependency unconditionally.
+DEPEND+="
+	test? ( dev-libs/elfutils )"
+
+RESTRICT="!test? ( test )"
+
+DOCS=( doc/{AUTHORS,MANUAL,NEWS}.adoc CONTRIBUTING.md README.md )
+
+PATCHES=(
+	"${FILESDIR}"/${PN}-3.5-nvcc-test.patch
+	"${FILESDIR}"/${PN}-4.0-objdump.patch
+	"${FILESDIR}"/${PN}-4.0-avoid-run-user.patch
+	"${FILESDIR}"/${PN}-4.0-atomic.patch
+)
+
+# ccache does not do it automatically. TODO: fix upstream
+need_latomic() {
+	# test if -latomic is needed and helps. -latomic is needed
+	# at least on ppc32. Use bit of inodeCache.cpp test.
+	cat >"${T}"/a-test.cc <<-EOF
+	#include <atomic>
+	#include <cstdint>
+	std::atomic<std::int64_t> a;
+	int main() { return a.load() == 0; }
+	EOF
+
+	local cxx_cmd=(
+		$(tc-getCXX)
+		$CXXFLAGS
+		$LDFLAGS
+		"${T}"/a-test.cc
+		-o "${T}"/a-test
+	)
+
+	einfo "${cxx_cmd[@]}"
+	"${cxx_cmd[@]}" && return 1
+
+	einfo "Trying to add -latomic"
+	einfo "${cxx_cmd[@]}"
+	cxx_cmd+=(-latomic)
+	"${cxx_cmd[@]}" && return 0
+
+	return 1
+}
+
+src_prepare() {
+	cmake_src_prepare
+
+	sed \
+		-e "/^EPREFIX=/s:'':'${EPREFIX}':" \
+		"${FILESDIR}"/ccache-config-3 > ccache-config || die
+
+	# mainly used in tests
+	tc-export CC OBJDUMP
+}
+
+src_configure() {
+	local mycmakeargs=(
+		-DLINK_WITH_ATOMIC=$(need_latomic && echo YES || echo NO)
+	)
+	cmake_src_configure
+}
+
+src_install() {
+	# TODO: install manpage: https://github.com/ccache/ccache/issues/684
+	cmake_src_install
+
+	dobin ccache-config
+	insinto /usr/share/shadowman/tools
+	newins - ccache <<<"${EPREFIX}/usr/lib/ccache/bin"
+}
+
+pkg_prerm() {
+	if [[ -z ${REPLACED_BY_VERSION} && ${ROOT:-/} == / ]] ; then
+		eselect compiler-shadow remove ccache
+	fi
+}
+
+pkg_postinst() {
+	if [[ ${ROOT:-/} == / ]]; then
+		eselect compiler-shadow update ccache
+	fi
+}