Compile program for debugging

I like to go through line by line of the source code in debug mode using gdb.
Where can I add in debugger option in the following Make file so that I can produce debug exe and release exe in one time running Make file?

################################################################################
# Copyright (c) 2019-2020, NVIDIA CORPORATION. All rights reserved.
#
# Permission is hereby granted, free of charge, to any person obtaining a
# copy of this software and associated documentation files (the "Software"),
# to deal in the Software without restriction, including without limitation
# the rights to use, copy, modify, merge, publish, distribute, sublicense,
# and/or sell copies of the Software, and to permit persons to whom the
# Software is furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
# THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
# DEALINGS IN THE SOFTWARE.
################################################################################

APP:= deepstream-app

TARGET_DEVICE = $(shell gcc -dumpmachine | cut -f1 -d -)

NVDS_VERSION:=5.0

LIB_INSTALL_DIR?=/opt/nvidia/deepstream/deepstream-$(NVDS_VERSION)/lib/
APP_INSTALL_DIR?=/opt/nvidia/deepstream/deepstream-$(NVDS_VERSION)/bin/

ifeq ($(TARGET_DEVICE),aarch64)
  CFLAGS:= -DPLATFORM_TEGRA
endif

SRCS:= $(wildcard *.c)
SRCS+= $(wildcard ../../apps-common/src/*.c)

INCS:= $(wildcard *.h)

PKGS:= gstreamer-1.0 gstreamer-video-1.0 x11

OBJS:= $(SRCS:.c=.o)

CFLAGS+= -I../../apps-common/includes -I../../../includes -DDS_VERSION_MINOR=0 -DDS_VERSION_MAJOR=5

LIBS+= -L$(LIB_INSTALL_DIR) -lnvdsgst_meta -lnvds_meta -lnvdsgst_helper -lnvdsgst_smartrecord -lnvds_utils -lm \
       -lgstrtspserver-1.0 -ldl -Wl,-rpath,$(LIB_INSTALL_DIR)

CFLAGS+= `pkg-config --cflags $(PKGS)`

LIBS+= `pkg-config --libs $(PKGS)`

all: $(APP)

%.o: %.c $(INCS) Makefile
        $(CC) -c -o $@ $(CFLAGS) $<
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You can directly add -g option to this line,
(CC) -c -g -o @ (CFLAGS) <

for gstreamer debugging, you could see documentation,
https://gstreamer.freedesktop.org/documentation/tutorials/basic/debugging-tools.html?gi-language=c