# Copyright 1999-2021 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2

EAPI=7

inherit cmake toolchain-funcs flag-o-matic

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"
# Enable 'static-c++' by default to make 'gcc' ebuild Just Work: bug #761220
IUSE="doc redis +static-c++ test"
RESTRICT="!test? ( test )"

DEPEND="app-arch/zstd:=
	redis? ( dev-libs/hiredis:= )"
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 )"
BDEPEND=" doc? ( dev-ruby/asciidoctor )"

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}-4.1-avoid-run-user.patch
)

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

	# Avoid dependency on libstdc++.so. Useful for cases when
	# we would like to use ccache to build older gcc which injects
	# into ccache locally built (possibly outdated) libstdc++
	# See bug #761220 for examples.
	#
	# Ideally gcc should not use LD_PRELOAD to avoid this type of failures.
	use static-c++ && append-ldflags -static-libstdc++
}

src_configure() {
	local mycmakeargs=(
		-DENABLE_DOCUMENTATION=$(usex doc)
		-DENABLE_TESTING=$(usex test)
		-DUSE_CCACHE=OFF
		-DZSTD_FROM_INTERNET=OFF
		-DREDIS_STORAGE_BACKEND=$(usex redis)
	)

	use redis && mycmakeargs+=( -DHIREDIS_FROM_INTERNET_DEFAULT=OFF )

	cmake_src_configure
}

src_install() {
	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
}