Support builds for MongoDB+RocksDB

Summary:
This changes the RocksDB build to share headers provided by MongoDB. It is invoked as:
  ROCKSDB_FOR_MONGO=/path/to/mongodb/root make static_lib

Task ID: #

Blame Rev:

Test Plan:
Revert Plan:

Database Impact:

Memcache Impact:

Other Notes:

EImportant:

- begin *PUBLIC* platform impact section -
Bugzilla: #
- end platform impact -

Reviewers: igor

Reviewed By: igor

Subscribers: dhruba

Differential Revision: https://reviews.facebook.net/D34071

build_tools/fbcode_config.sh

@@ -18,13 +18,27 @@ GLIBC_REV=7397bed99280af5d9543439cdb7d018af7542720
 GLIBC_INCLUDE="/mnt/gvfs/third-party2/glibc/$GLIBC_REV/2.20/gcc-4.9-glibc-2.20/99df8fc/include"
 GLIBC_LIBS=" -L /mnt/gvfs/third-party2/glibc/$GLIBC_REV/2.20/gcc-4.9-glibc-2.20/99df8fc/lib"
 
-# location of snappy headers and libraries
+# snappy and zlib depend are bundled with MongoDB so we wan't to pick up the bundled headers when
+# building for it and disable block compressors supported by RocksDB but not used by MongoDB.
+
+if [[ -n $ROCKSDB_FOR_MONGO ]]; then
+
+MONGO_SRC="$ROCKSDB_FOR_MONGO/src/third_party"
+SNAPPY_INCLUDE=" -I $MONGO_SRC/snappy-1.1.2"
+CFLAGS+=" -DSNAPPY"
+ZLIB_INCLUDE=" -I $MONGO_SRC/zlib-1.2.8"
+CFLAGS+=" -DZLIB"
+
+else
+
 SNAPPY_INCLUDE=" -I /mnt/gvfs/third-party2/snappy/b0f269b3ca47770121aa159b99e1d8d2ab260e1f/1.0.3/gcc-4.9-glibc-2.20/c32916f/include/"
+
 if test -z $PIC_BUILD; then
   SNAPPY_LIBS=" /mnt/gvfs/third-party2/snappy/b0f269b3ca47770121aa159b99e1d8d2ab260e1f/1.0.3/gcc-4.9-glibc-2.20/c32916f/lib/libsnappy.a"
 else
   SNAPPY_LIBS=" /mnt/gvfs/third-party2/snappy/b0f269b3ca47770121aa159b99e1d8d2ab260e1f/1.0.3/gcc-4.9-glibc-2.20/c32916f/lib/libsnappy_pic.a"
 fi
+
 CFLAGS+=" -DSNAPPY"
 
 if test -z $PIC_BUILD; then
@@ -42,6 +56,7 @@ if test -z $PIC_BUILD; then
   LZ4_LIBS=" /mnt/gvfs/third-party2/lz4/79d2943e2dd7208a3e0b06cf95e9f85f05fe9e1b/r124/gcc-4.9-glibc-2.20/4230243/lib/liblz4.a"
   CFLAGS+=" -DLZ4"
 fi
+fi
 
 # location of gflags headers and libraries
 GFLAGS_INCLUDE=" -I /mnt/gvfs/third-party2/gflags/0fa60e2b88de3e469db6c482d6e6dac72f5d65f9/1.6/gcc-4.9-glibc-2.20/4230243/include/"