diff -ur ceph-12.2.5/src/rocksdb/CMakeLists.txt ceph-12.2.5-mod/src/rocksdb/CMakeLists.txt
--- ceph-12.2.5/src/rocksdb/CMakeLists.txt	2018-03-12 02:58:51.000000000 +0100
+++ ceph-12.2.5-mod/src/rocksdb/CMakeLists.txt	2018-05-22 19:37:31.767465710 +0200
@@ -174,15 +174,6 @@
   PROPERTIES COMPILE_FLAGS "-msse4.2")
 endif()
 
-option(FAIL_ON_WARNINGS "Treat compile warnings as errors" ON)
-if(FAIL_ON_WARNINGS)
-  if(MSVC)
-    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /WX")
-  else() # assume GCC
-    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Werror")
-  endif()
-endif()
-
 option(WITH_ASAN "build with ASAN" OFF)
 if(WITH_ASAN)
   add_definitions(-DROCKSDB_TSAN_RUN)
diff -ur ceph-12.2.5/src/rocksdb/Makefile ceph-12.2.5-mod/src/rocksdb/Makefile
--- ceph-12.2.5/src/rocksdb/Makefile	2018-03-12 02:58:51.000000000 +0100
+++ ceph-12.2.5-mod/src/rocksdb/Makefile	2018-05-22 19:37:59.043996026 +0200
@@ -243,10 +243,6 @@
 WARNING_FLAGS = -W -Wextra -Wall -Wsign-compare -Wshadow \
   -Wno-unused-parameter
 
-ifndef DISABLE_WARNING_AS_ERROR
-	WARNING_FLAGS += -Werror
-endif
-
 
 ifdef LUA_PATH