Add NDEBUG

Author: chenzhangyi

Makefile

@@ -6,7 +6,7 @@ include config.mk
 # 2. Added -D__const__= : Avoid over-optimizations of TLS variables by GCC>=4.8
 # 3. Removed -Werror: Not block compilation for non-vital warnings, especially when the
 #    code is tested on newer systems. If the code is used in production, add -Werror back
-CPPFLAGS+=-DBTHREAD_USE_FAST_PTHREAD_MUTEX -D__const__= -D_GNU_SOURCE -DUSE_SYMBOLIZE -DNO_TCMALLOC -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -D__STDC_CONSTANT_MACROS -DBRPC_REVISION=\"$(shell git rev-parse --short HEAD)\"
+CPPFLAGS+=-DBTHREAD_USE_FAST_PTHREAD_MUTEX -D__const__= -D_GNU_SOURCE -DUSE_SYMBOLIZE -DNO_TCMALLOC -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -D__STDC_CONSTANT_MACROS -DNDEBUG -DBRPC_REVISION=\"$(shell git rev-parse --short HEAD)\"
 CXXFLAGS=$(CPPFLAGS) -O2 -pipe -Wall -W -fPIC -fstrict-aliasing -Wno-invalid-offsetof -Wno-unused-parameter -fno-omit-frame-pointer -std=c++0x
 CFLAGS=$(CPPFLAGS) -O2 -pipe -Wall -W -fPIC -fstrict-aliasing -Wno-unused-parameter -fno-omit-frame-pointer
 DEBUG_CXXFLAGS = $(filter-out -DNDEBUG,$(CXXFLAGS)) -DUNIT_TEST -DBVAR_NOT_LINK_DEFAULT_VARIABLES