dev-libs/date: add new 'date' C++ library

The 'date' library is voted into C++20 and Howard Hinnants
implementation serves as a free standing library and foundation for the
standardized library.

Bug: https://bugs.gentoo.org/712236
Package-Manager: Portage-3.0.2, Repoman-2.3.23
Signed-off-by: Jonas Toth <gentoo@jonas-toth.eu>
Signed-off-by: Sam James <sam@gentoo.org>

1 files changed, 55 insertions, 0 deletions

diff --git a/dev-libs/date/date-3.0.0.ebuild b/dev-libs/date/date-3.0.0.ebuild
new file mode 100644
index 000000000000..1b7acb557db0
--- /dev/null
+++ b/dev-libs/date/date-3.0.0.ebuild
@@ -0,0 +1,55 @@
+# Copyright 1999-2020 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=7
+
+inherit cmake
+
+DESCRIPTION="A date and time library based on the C++11/14/17 <chrono> header"
+HOMEPAGE="https://github.com/HowardHinnant/date"
+
+SRC_URI="https://github.com/HowardHinnant/${PN}/archive/v${PV}.tar.gz -> ${P}.tar.gz"
+KEYWORDS="~amd64"
+
+LICENSE="MIT"
+SLOT="0"
+IUSE="only-c-locale test"
+RESTRICT="!test? ( test )"
+
+PATCHES=(
+	"${FILESDIR}"/${P}-c-locale-export.patch
+	"${FILESDIR}"/${P}-version.patch
+)
+
+src_prepare() {
+	# The test cases are implicitly generated with CMake code, that parses
+	# the file names for ".cpp" and ".fail.cpp". Renaming the source files
+	# disables the test.
+
+	# This test case fails due to a stdlibc++ bug.
+	# Upstream bug: https://github.com/HowardHinnant/date/issues/388
+	mv "test/date_test/parse.pass.cpp" "test/date_test/parse.disabled" || ewarn "Can not deactivate test case, test failure expected"
+
+	# This test case fails only when the CMAKE_BUILD_TYPE=Gentoo.
+	# The behaviour seems very strange, but does not appear with a
+	# "valid" build type.
+	# Upstream bug: https://github.com/HowardHinnant/date/issues/604
+	mv "test/clock_cast_test/local_t.pass.cpp" "test/clock_cast_test/local_t.disabled" || ewarn "Can not deactivate test case, test failure expected"
+
+	cmake_src_prepare
+}
+
+src_configure() {
+	local mycmakeargs=(
+		-DBUILD_TZ_LIB=ON
+		-DUSE_SYSTEM_TZ_DB=ON
+		-DENABLE_DATE_TESTING=$(usex test)
+		-DCOMPILE_WITH_C_LOCALE=$(usex only-c-locale)
+	)
+	cmake_src_configure
+}
+
+src_test() {
+	cd "${BUILD_DIR}" || die
+	ninja testit
+}