1 files changed, 12 insertions, 5 deletions
diff --git a/Makefile b/Makefile
index e7408d793..a960fc14a 100644
--- a/Makefile
+++ b/Makefile
@@ -7,12 +7,19 @@ export LL = gcc
 export AR = ar
 export YACC = bison
 
-DEBUG_MODE = 1
-ifeq ($(DEBUG_MODE),1)
-CFLAGS = -g -O3
-else
-CFLAGS = -O3
+ifeq ($(strip $(COMPILE_MODE)),)
+  # default compile option
+  COMPILE_MODE = debug
+endif
+
+ifeq ($(COMPILE_MODE),debug)
+  CFLAGS = -g -O3
+else ifeq ($(COMPILE_MODE),release)
+  CFLAGS = -O3
+else ifeq ($(COMPILE_MODE),small)
+  CFLAGS = -Os
 endif
+
 ALL_CFLAGS = -Wall -Werror-implicit-function-declaration $(CFLAGS)
 ifeq ($(OS),Windows_NT)
   MAKE_FLAGS = --no-print-directory CC=$(CC) LL=$(LL) ALL_CFLAGS='$(ALL_CFLAGS)'