RocksJava build target for Docker on ppc64le

Summary:
This enables us to crossbuild pcc64le RocksJava binaries with a suitably old version of glibc (2.17) on CentOS 7.
Closes https://github.com/facebook/rocksdb/pull/2491

Differential Revision: D5955301

Pulled By: sagar0

fbshipit-source-id: 69ef9746f1dc30ffde4063dc764583d8c7ae937e

Makefile

@@ -1690,6 +1690,14 @@ rocksdbjavastaticreleasedocker: rocksdbjavastatic
 	cd java/target;jar -uf $(ROCKSDB_JAR_ALL) librocksdbjni-*.so librocksdbjni-*.jnilib
 	cd java/target/classes;jar -uf ../$(ROCKSDB_JAR_ALL) org/rocksdb/*.class org/rocksdb/util/*.class
 
+rocksdbjavastaticdockerppc64le:
+	mkdir -p java/target
+	DOCKER_LINUX_PPC64LE_CONTAINER=`docker ps -aqf name=rocksdb_linux_ppc64le-be`; \
+	if [ -z "$$DOCKER_LINUX_PPC64LE_CONTAINER" ]; then \
+		docker container create --attach stdin --attach stdout --attach stderr --volume `pwd`:/rocksdb-host --name rocksdb_linux_ppc64le-be evolvedbinary/rocksjava:centos7_ppc64le-be /rocksdb-host/java/crossbuild/docker-build-linux-centos.sh; \
+	fi
+	docker start -a rocksdb_linux_ppc64le-be
+
 rocksdbjavastaticpublish: rocksdbjavastaticrelease rocksdbjavastaticpublishcentral
 
 rocksdbjavastaticpublishdocker: rocksdbjavastaticreleasedocker rocksdbjavastaticpublishcentral

java/crossbuild/docker-build-linux-centos.sh

@@ -5,7 +5,15 @@ set -e
 rm -rf /rocksdb-local
 cp -r /rocksdb-host /rocksdb-local
 cd /rocksdb-local
-scl enable devtoolset-2 'make jclean clean'
-scl enable devtoolset-2 'PORTABLE=1 make rocksdbjavastatic'
+
+# Use scl devtoolset if available (i.e. CentOS <7)
+if hash scl 2>/dev/null; then
+	scl enable devtoolset-2 'make jclean clean'
+	scl enable devtoolset-2 'PORTABLE=1 make rocksdbjavastatic'
+else
+	make jclean clean
+        PORTABLE=1 make rocksdbjavastatic
+fi
+
 cp java/target/librocksdbjni-linux*.so java/target/rocksdbjni-*-linux*.jar /rocksdb-host/java/target