Build Qt5 error from deepstream-app

PhongNT

Hello all,

I am try to build my app in C with Qt5, but it not working and show many error:

In file included from /usr/include/aarch64-linux-gnu/qt5/QtCore/qstring.h:48:0,
                 from /usr/include/aarch64-linux-gnu/qt5/QtCore/qcoreapplication.h:44,
                 from /usr/include/aarch64-linux-gnu/qt5/QtWidgets/qapplication.h:44,
                 from /usr/include/aarch64-linux-gnu/qt5/QtWidgets/QApplication:1,
                 from deepstream_test3_app.c:27:
/usr/include/aarch64-linux-gnu/qt5/QtCore/qchar.h:48:1: error: unknown type name ‘class’
 class QString;
 ^~~~~
/usr/include/aarch64-linux-gnu/qt5/QtCore/qchar.h:52:1: error: expected specifier-qualifier-list before ‘public’
 public:
 ^~~~~~
/usr/include/aarch64-linux-gnu/qt5/QtCore/qchar.h:62:1: warning: data definition has no type or storage class
 class Q_CORE_EXPORT QChar {.....

My include code:

#include <gst/gst.h>
#include <glib.h>
#include <gst/video/videooverlay.h>

#include <QApplication>
#include <QTimer>
#include <QWidget>

#include <stdio.h>
#include <math.h>
....

Makefile:

CUDA_VER?=10.2
ifeq ($(CUDA_VER),)
  $(error "CUDA_VER is not set")
endif

APP:= deepstream-test3-app

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

NVDS_VERSION:=6.0

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/deepstream_perf.c)

INCS:= $(wildcard *.h)

PKGS:= gstreamer-1.0

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

CFLAGS+= -I../../../includes \
		-I../../apps-common/includes \
		-I /usr/local/cuda-$(CUDA_VER)/include \
		-I /usr/include/aarch64-linux-gnu/qt5 \
		-I /usr/include/aarch64-linux-gnu/qt5/QtWidgets \
		-I /usr/include/aarch64-linux-gnu/qt5/QtCore \
		-I /usr/include/aarch64-linux-gnu/qt5/QtGui \

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

LIBS:= $(shell pkg-config --libs $(PKGS))

LIBS+= -L/usr/local/cuda-$(CUDA_VER)/lib64/ -lcudart -lnvdsgst_helper -lm \
		-L$(LIB_INSTALL_DIR) -lnvdsgst_meta -lnvds_meta \
		-lcuda -Wl,-rpath,$(LIB_INSTALL_DIR) \
		-lQt5Widgets -lQt5Gui -lQt5Core

all: $(APP)

%.o: %.c $(INCS) Makefile
	$(CC) -c -o $@ $(CFLAGS) $<

$(APP): $(OBJS) Makefile
	$(CC) -o $(APP) $(OBJS) $(LIBS)

install: $(APP)
	cp -rv $(APP) $(APP_INSTALL_DIR)

clean:
	rm -rf $(OBJS) $(APP)

Please help me.

Thank so much

SGaist

Hi and welcome to devnet,

Qt is a C++ framework so unless you have written C wrappers around it you will need to build your code a C++.

See mixing C and C++ in the iso cpp wiki%3B%20%2F%2F%20one%20way).