Take "-g -G" flags off 'ldpc' make tag

Add "-g -G" flags would make the execution less efficient,
so add them when needed

openair1/PHY/CODING/GPU_LDPC/optimized_ldpc/Makefile

@@ -3,18 +3,20 @@ TXT = gen_matrix.txt
 DEBUG = debug
 FILE = channel_output.txt
 num = 1
+CFLAGS=
 
 gen: clean gen_idx.c
 	$(CC) $(EXEC).c -o $(EXEC) -g
 
 ldpc: clean ldpc.cu 
 	cp ../test_input/8448/$(num).txt $(FILE)
-	nvcc -arch=compute_70 -rdc=true ldpc.cu -o ldpc -g -G
+	nvcc $(CFLAGS) ldpc.cu -o ldpc
 	mkdir debug
 
 test: ldpc
 	./check.sh
 
+cgdb: CFLAGS += -g -G
 cgdb: clean ldpc
 	cuda-gdb --silent --args ldpc $(FILE)