--- percona-server-5.7.12-5/cmake/build_configurations/compiler_options.cmake~	2016-06-19 22:55:34.000000000 +0300
+++ percona-server-5.7.12-5/cmake/build_configurations/compiler_options.cmake	2016-06-19 22:58:00.531159698 +0300
@@ -33,8 +33,8 @@
     IF(WITH_VALGRIND)
       SET(COMMON_C_FLAGS             "-fno-inline ${COMMON_C_FLAGS}")
     ENDIF()
-    SET(CMAKE_C_FLAGS_DEBUG          "${COMMON_C_FLAGS}")
-    SET(CMAKE_C_FLAGS_RELWITHDEBINFO "-O3 -D_FORTIFY_SOURCE=2 ${COMMON_C_FLAGS}")
+    SET(CMAKE_C_FLAGS_DEBUG          "${CMAKE_C_FLAGS_DEBUG} ${COMMON_C_FLAGS}")
+    SET(CMAKE_C_FLAGS_RELWITHDEBINFO "-O3 -D_FORTIFY_SOURCE=2 ${CMAKE_C_FLAGS_RELWITHDEBINFO} ${COMMON_C_FLAGS}")
   ENDIF()
   IF(CMAKE_COMPILER_IS_GNUCXX)
     SET(COMMON_CXX_FLAGS               "-g -fabi-version=2 -fno-omit-frame-pointer -fno-strict-aliasing")
@@ -42,20 +42,20 @@
     IF(WITH_VALGRIND)
       SET(COMMON_CXX_FLAGS             "-fno-inline ${COMMON_CXX_FLAGS}")
     ENDIF()
-    SET(CMAKE_CXX_FLAGS_DEBUG          "${COMMON_CXX_FLAGS}")
-    SET(CMAKE_CXX_FLAGS_RELWITHDEBINFO "-O3 -D_FORTIFY_SOURCE=2 ${COMMON_CXX_FLAGS}")
+    SET(CMAKE_CXX_FLAGS_DEBUG          "${CMAKE_CXX_FLAGS_DEBUG} ${COMMON_CXX_FLAGS}")
+    SET(CMAKE_CXX_FLAGS_RELWITHDEBINFO "-O3 -D_FORTIFY_SOURCE=2 ${CMAKE_CXX_FLAGS_RELWITHDEBINFO} ${COMMON_CXX_FLAGS}")
   ENDIF()
 
   # Default Clang flags
   IF(CMAKE_C_COMPILER_ID MATCHES "Clang")
     SET(COMMON_C_FLAGS               "-g -fno-omit-frame-pointer -fno-strict-aliasing")
-    SET(CMAKE_C_FLAGS_DEBUG          "${COMMON_C_FLAGS}")
-    SET(CMAKE_C_FLAGS_RELWITHDEBINFO "-O3 -D_FORTIFY_SOURCE=2 ${COMMON_C_FLAGS}")
+    SET(CMAKE_C_FLAGS_DEBUG          "${CMAKE_C_FLAGS_DEBUG} ${COMMON_C_FLAGS}")
+    SET(CMAKE_C_FLAGS_RELWITHDEBINFO "-O3 -D_FORTIFY_SOURCE=2 ${CMAKE_C_FLAGS_RELWITHDEBINFO} ${COMMON_C_FLAGS}")
   ENDIF()
   IF(CMAKE_CXX_COMPILER_ID MATCHES "Clang")
     SET(COMMON_CXX_FLAGS               "-g -fno-omit-frame-pointer -fno-strict-aliasing")
-    SET(CMAKE_CXX_FLAGS_DEBUG          "${COMMON_CXX_FLAGS}")
-    SET(CMAKE_CXX_FLAGS_RELWITHDEBINFO "-O3 -D_FORTIFY_SOURCE=2 ${COMMON_CXX_FLAGS}")
+    SET(CMAKE_CXX_FLAGS_DEBUG          "${CMAKE_CXX_FLAGS_DEBUG} ${COMMON_CXX_FLAGS}")
+    SET(CMAKE_CXX_FLAGS_RELWITHDEBINFO "-O3 -D_FORTIFY_SOURCE=2 ${CMAKE_CXX_FLAGS_RELWITHDEBINFO} ${COMMON_CXX_FLAGS}")
   ENDIF()
 
   # Solaris flags