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