dev-libs/leveldb: bump to 1.20, sub-slot to avoid ABI breakage

* Upstream broke the ABI without changing the SONAME so we have to
  introduce a sub-slot, see
  https://github.com/google/leveldb/issues/536
  All reverse dependencies should now have the slot operator set, which
  will trigger rebuilds when required. The case of bitcoin is special
  because they only support specific leveldb versions.
* Properly handle USE=static-libs when USE=snappy isn't set, change
  package.use.mask entry. See https://bugs.gentoo.org/651604
* Update the patch to build libmemenv.so which is required by bitcoin,
  see https://github.com/google/leveldb/issues/236
* The patch also disables test building, allowing us to make src_compile
  more elegant.
* Remove MIPS patch which was merged: https://github.com/google/leveldb/pull/272
* Bump to EAPI=7

Closes: https://bugs.gentoo.org/609966
Package-Manager: Portage-2.3.40, Repoman-2.3.9

3 files changed, 97 insertions, 0 deletions

diff --git a/dev-libs/leveldb/Manifest b/dev-libs/leveldb/Manifest
index fe266e35e0c0..b8841988af29 100644
--- a/dev-libs/leveldb/Manifest
+++ b/dev-libs/leveldb/Manifest
@@ -6,4 +6,5 @@ DIST leveldb-1.14.0.tar.gz 208282 BLAKE2B 438520df4fdaee3cd2439d8f242b119a923e53
 DIST leveldb-1.15.0.tar.gz 205691 BLAKE2B 29ebe99ba8b2c44943a2c07c6c0e3a2136c53e15cbbb1fb807cb198b8849433c84ee5c4976fd898a84f2bddb38e543a0e45aedfabc1a46029ca23d39f8b0103e SHA512 af5b18a7750ac553659075c1c34aa2fddf6322b6837f096589cf5908c7050fd19053cd98d19fd7097e0840392b318f0166360d3a0595adcaaabcfdf393246775
 DIST leveldb-1.17.tar.gz 207037 BLAKE2B edeb366b9b17fec1a2bc0c0ca8636068bdd65dd1c017a4508c787714da0a202912d1283de9c77c94c9d34784fe552ab344e671fa351ec14f775b1e1037ffbef0 SHA512 d35401a92fa2b59c46e97ab94a9c70d0d5f97dbc7868a75354e088489338c078f47feaa3371489c481317b45ace6bd207d29676f5c18076ced86aa3f9fa44e58
 DIST leveldb-1.18.tar.gz 209376 BLAKE2B 08d63fe8aed45d38befd29caddee5a229ff847d254b30be55715793a621e840641d53af47e4fd93286ff0445d6001be26aa00063c075681659f7ceb692184249 SHA512 3d9c55a7bf8692914784ec33c273704ce9978496b071c7b661708f049d0d4ccd51a44441f50c3e536725caeb9896575192f52708a4bb1c0222cecdeec89919a3
+DIST leveldb-1.20.tar.gz 223141 BLAKE2B 57ab5cb191679b8fbfaa28fa0a61ee1dcd757bb9c70215dd325daebfd93b30aa9bbe3c993a1758aa9804a7cd6f2c31df7cf98bdf98320cd1aebc14f5eb77d9a5 SHA512 c59258f2f58ce2d5680e9ab3da4ab0923d91cd4648dcf63cdaa26cdde92bf45e094544539ad11d8e09a4a4813435286143ed0e86c21c6c31a0596903ed4744d2
 DIST leveldb-1.9.0.tar.gz 203872 BLAKE2B 5fa6d361d82bd386a722b24f52b851791555c6cf77939bd6b55feaa75f0db0e216f84b2b3d23f4cac3bf522fb5fcbbf8b7adb46e4731d0ba161c82124cde9abf SHA512 47b0a3272eef2d677ddeb8d0c973e59a1be4bff580528c3bc3f83a654f41485ecc86892d9124ce21ef747c220f98cdad687436849dc978adfd42f8c8c05b9160
diff --git a/dev-libs/leveldb/files/leveldb-1.20-memenv-so.patch b/dev-libs/leveldb/files/leveldb-1.20-memenv-so.patch
new file mode 100644
index 000000000000..d443ef0ad262
--- /dev/null
+++ b/dev-libs/leveldb/files/leveldb-1.20-memenv-so.patch
@@ -0,0 +1,33 @@
+# Create libmemenv.so and don't compile programs by default
+# Add a static_programs target to compile test programs
+--- a/Makefile	2018-06-03 16:52:28.839614213 +0200
++++ b/Makefile	2018-06-03 16:52:18.209544310 +0200
+@@ -128,15 +128,27 @@
+ 	ln -fs $(SHARED_LIB3) $(SHARED_OUTDIR)/$(SHARED_LIB1)
+ $(SHARED_OUTDIR)/$(SHARED_LIB2): $(SHARED_OUTDIR)/$(SHARED_LIB3)
+ 	ln -fs $(SHARED_LIB3) $(SHARED_OUTDIR)/$(SHARED_LIB2)
++SHARED_MEMENV_LIB1 = libmemenv.$(PLATFORM_SHARED_EXT)
++SHARED_MEMENV_LIB2 = $(SHARED_MEMENV_LIB1).$(SHARED_VERSION_MAJOR)
++SHARED_MEMENV_LIB3 = $(SHARED_MEMENV_LIB1).$(SHARED_VERSION_MAJOR).$(SHARED_VERSION_MINOR)
++SHARED_MEMENV_LIBS = $(SHARED_OUTDIR)/$(SHARED_MEMENV_LIB1) $(SHARED_OUTDIR)/$(SHARED_MEMENV_LIB2) $(SHARED_OUTDIR)/$(SHARED_MEMENV_LIB3)
++$(SHARED_OUTDIR)/$(SHARED_MEMENV_LIB1): $(SHARED_OUTDIR)/$(SHARED_MEMENV_LIB3)
++	ln -fs $(SHARED_MEMENV_LIB3) $(SHARED_OUTDIR)/$(SHARED_MEMENV_LIB1)
++$(SHARED_OUTDIR)/$(SHARED_MEMENV_LIB2): $(SHARED_OUTDIR)/$(SHARED_MEMENV_LIB3)
++	ln -fs $(SHARED_MEMENV_LIB3) $(SHARED_OUTDIR)/$(SHARED_MEMENV_LIB2)
+ SHARED_MEMENVLIB = $(SHARED_OUTDIR)/libmemenv.a
+ endif
+ 
+ $(SHARED_OUTDIR)/$(SHARED_LIB3): $(SHARED_LIBOBJECTS)
+ 	$(CXX) $(LDFLAGS) $(PLATFORM_SHARED_LDFLAGS)$(SHARED_LIB2) $(SHARED_LIBOBJECTS) -o $(SHARED_OUTDIR)/$(SHARED_LIB3) $(LIBS)
++$(SHARED_OUTDIR)/$(SHARED_MEMENV_LIB3): $(SHARED_MEMENVOBJECTS)
++	$(CXX) $(LDFLAGS) $(PLATFORM_SHARED_LDFLAGS)$(SHARED_MEMENV_LIB2) $(SHARED_MEMENVOBJECTS) -o $(SHARED_OUTDIR)/$(SHARED_MEMENV_LIB3) $(LIBS)
+ 
+ endif  # PLATFORM_SHARED_EXT
+ 
+-all: $(SHARED_LIBS) $(SHARED_PROGRAMS) $(STATIC_OUTDIR)/libleveldb.a $(STATIC_OUTDIR)/libmemenv.a $(STATIC_PROGRAMS)
++all: $(SHARED_LIBS) $(SHARED_MEMENV_LIBS)
++
++static_programs: $(STATIC_PROGRAMS)
+ 
+ check: $(STATIC_PROGRAMS)
+ 	for t in $(notdir $(TESTS)); do echo "***** Running $$t"; $(STATIC_OUTDIR)/$$t || exit 1; done
diff --git a/dev-libs/leveldb/leveldb-1.20.ebuild b/dev-libs/leveldb/leveldb-1.20.ebuild
new file mode 100644
index 000000000000..e8b13b5798a1
--- /dev/null
+++ b/dev-libs/leveldb/leveldb-1.20.ebuild
@@ -0,0 +1,63 @@
+# Copyright 1999-2018 Gentoo Foundation
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=7
+
+inherit multilib toolchain-funcs
+
+DESCRIPTION="a fast key-value storage library written at Google"
+HOMEPAGE="http://leveldb.org/ https://github.com/google/leveldb"
+SRC_URI="https://github.com/google/${PN}/archive/v${PV}.tar.gz -> ${P}.tar.gz"
+
+LICENSE="BSD"
+# https://github.com/google/leveldb/issues/536
+SLOT="0/1"
+KEYWORDS="~amd64 ~arm ~arm64 ~mips ~ppc ~ppc64 ~x86 ~amd64-fbsd ~amd64-linux ~x86-linux"
+IUSE="+snappy static-libs kernel_FreeBSD +tcmalloc test"
+
+DEPEND="tcmalloc? ( dev-util/google-perftools )
+	snappy? (
+		app-arch/snappy:=
+	)"
+RDEPEND="${DEPEND}"
+
+# https://bugs.gentoo.org/651604
+REQUIRED_USE="snappy? ( !static-libs )"
+
+# https://github.com/google/leveldb/issues/234
+# https://github.com/google/leveldb/issues/236
+PATCHES=( "${FILESDIR}"/{${PN}-1.18-configure.patch,${P}-memenv-so.patch} )
+
+src_configure() {
+	# These vars all get picked up by build_detect_platform
+	tc-export AR CC CXX
+	export OPT="-DNDEBUG ${CPPFLAGS}"
+
+	TARGET_OS=$(usex kernel_FreeBSD FreeBSD Linux) \
+	USE_SNAPPY=$(usex snappy) \
+	USE_TCMALLOC=no \
+	TMPDIR=${T} \
+	sh -x ./build_detect_platform build_config.mk ./ || die
+}
+
+src_compile() {
+	default
+	usex static-libs && emake out-static/lib{leveldb,memenv}.a
+	use test && emake static_programs
+}
+
+src_test() {
+	emake check
+}
+
+src_install() {
+	insinto /usr/include
+	doins -r include/.
+	# This matches the path Debian picked. Upstream provides no guidance.
+	insinto /usr/include/leveldb/helpers
+	doins helpers/memenv/memenv.h
+
+	dolib.so out-shared/libleveldb*$(get_libname)*
+	use static-libs && dolib.a out-static/lib{leveldb,memenv}.a
+	dolib.so out-shared/libmemenv*$(get_libname)*
+}