Fix build error with blob DB.

Summary:
snprintf is in <stdio.h> and not in namespace std.
Closes https://github.com/facebook/rocksdb/pull/2287

Reviewed By: anirbanr-fb

Differential Revision: D5054752

Pulled By: yiwu-arbug

fbshipit-source-id: 356807ec38f3c7d95951cdb41f31a3d3ae0714d4

CMakeLists.txt

@@ -669,7 +669,6 @@ set(TESTS
         util/thread_list_test.cc
         util/thread_local_test.cc
         utilities/backupable/backupable_db_test.cc
-        utilities/blob_db/blob_db_test.cc
         utilities/checkpoint/checkpoint_test.cc
         utilities/column_aware_encoding_test.cc
         utilities/date_tiered/date_tiered_test.cc

Makefile

@@ -1110,9 +1110,6 @@ prefix_test: db/prefix_test.o $(LIBOBJECTS) $(TESTHARNESS)
 backupable_db_test: utilities/backupable/backupable_db_test.o $(LIBOBJECTS) $(TESTHARNESS)
 	$(AM_LINK)
 
-blob_db_test: utilities/blob_db/blob_db_test.o $(LIBOBJECTS) $(TESTHARNESS)
-	$(AM_LINK)
-
 checkpoint_test: utilities/checkpoint/checkpoint_test.o $(LIBOBJECTS) $(TESTHARNESS)
 	$(AM_LINK)
 

TARGETS

@@ -328,7 +328,6 @@ ROCKS_TESTS = [['merger_test', 'table/merger_test.cc', 'serial'],
  ['compact_files_test', 'db/compact_files_test.cc', 'serial'],
  ['db_options_test', 'db/db_options_test.cc', 'serial'],
  ['object_registry_test', 'utilities/object_registry_test.cc', 'serial'],
- ['blob_db_test', 'utilities/blob_db/blob_db_test.cc', 'serial'],
  ['auto_roll_logger_test', 'util/auto_roll_logger_test.cc', 'serial'],
  ['dbformat_test', 'db/dbformat_test.cc', 'serial'],
  ['write_batch_with_index_test',

src.mk

@@ -319,7 +319,6 @@ MAIN_SOURCES =                                                    \
   util/thread_list_test.cc                                              \
   util/thread_local_test.cc                                             \
   utilities/backupable/backupable_db_test.cc                            \
-  utilities/blob_db/blob_db_test.cc                                     \
   utilities/checkpoint/checkpoint_test.cc                               \
   utilities/column_aware_encoding_exp.cc                                \
   utilities/column_aware_encoding_test.cc                               \

utilities/blob_db/blob_file.cc

@@ -6,6 +6,7 @@
 
 #include <chrono>
 #include <cinttypes>
+#include <cstdio>
 #include <memory>
 #include "utilities/blob_db/blob_db_impl.h"