app-arch/zstd: fix underlinking against pthreads, bug #713940

buscher noticed late gcc-10 link failure which exposed an
underlinked libzstd.so when built with multithreaded support.

The change adds an ebuild workaround to compile/link against
-pthread on platforms where this options exist. Real fix is
left to upstream.

Reported-by: buscher on #gentoo-toolchain
Closes: https://bugs.gentoo.org/713940
Package-Manager: Portage-2.3.94, Repoman-2.3.21
Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>

diff --git a/app-arch/zstd/zstd-1.4.4-r4.ebuild b/app-arch/zstd/zstd-1.4.4-r4.ebuild
new file mode 100644 (file)
index 0000000..6fa907a
--- /dev/null
+++ b/app-arch/zstd/zstd-1.4.4-r4.ebuild
@@ -0,0 +1,74 @@
+# Copyright 1999-2020 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=7
+
+inherit flag-o-matic multilib-minimal toolchain-funcs
+
+DESCRIPTION="zstd fast compression library"
+HOMEPAGE="https://facebook.github.io/zstd/"
+SRC_URI="https://github.com/facebook/${PN}/archive/v${PV}.tar.gz -> ${P}.tar.gz"
+
+LICENSE="|| ( BSD GPL-2 )"
+SLOT="0/1"
+KEYWORDS="~alpha ~amd64 ~arm ~arm64 ~hppa ~ia64 ~mips ~ppc ~ppc64 ~s390 ~sparc ~x86 ~amd64-linux ~x86-linux ~ppc-macos ~x64-macos ~x86-macos ~sparc-solaris ~sparc64-solaris ~x64-solaris ~x86-solaris"
+IUSE="lz4 static-libs +threads"
+
+RDEPEND="app-arch/xz-utils
+       lz4? ( app-arch/lz4 )"
+DEPEND="${RDEPEND}"
+
+PATCHES=(
+       "${FILESDIR}/${P}-pkgconfig_libdir.patch" #700780
+       "${FILESDIR}/${P}-make43.patch" #708110
+)
+
+src_prepare() {
+       default
+       multilib_copy_sources
+
+       # Workaround #713940 / https://github.com/facebook/zstd/issues/2045
+       # where upstream build system does not add -pthread for Makefile-based
+       # build system.
+       use threads && append-flags $(test-flags-CCLD -pthread)
+}
+
+mymake() {
+       emake \
+               CC="$(tc-getCC)" \
+               CXX="$(tc-getCXX)" \
+               AR="$(tc-getAR)" \
+               PREFIX="${EPREFIX}/usr" \
+               LIBDIR="${EPREFIX}/usr/$(get_libdir)" \
+               "${@}"
+}
+
+multilib_src_compile() {
+       local libzstd_targets=( libzstd{,.a}$(usex threads '-mt' '') )
+
+       mymake -C lib ${libzstd_targets[@]} libzstd.pc
+
+       if multilib_is_native_abi ; then
+               mymake HAVE_LZ4="$(usex lz4 1 0)" zstd
+
+               mymake -C contrib/pzstd
+       fi
+}
+
+multilib_src_install() {
+       mymake -C lib DESTDIR="${D}" install
+
+       if multilib_is_native_abi ; then
+               mymake -C programs DESTDIR="${D}" install
+
+               mymake -C contrib/pzstd DESTDIR="${D}" install
+       fi
+}
+
+multilib_src_install_all() {
+       einstalldocs
+
+       if ! use static-libs; then
+               find "${ED}" -name "*.a" -delete || die
+       fi
+}